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(no NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE TOLD TO DO SO)

T.B.C. : B-GTD-0-SAA Test Booklet Series

TEST BOOKLET ELECTRONICS & TELECOI\-IMUNICATION

ENGINEERING

Paper-1

A (Time Allowed : Two Hours) ＨｾｍＢ｡ｸｩｭｵｭ＠ ｾｦｴＭｦ｡ｲｫｳ＠ : 2SO J

INSTRUCTIONS

1. IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK THAT THIS TEST BOOKLETDOES NOT HAVE ANY U_"l"PRINTED OR TORN OR MISSING PAGES OR ITEMS, ETC. IF SO, GET IT REPLAC3D BY A COMPLETE TEST BOOKLET.

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3.

4.

5.

6. ?.

8 .

9. 11.

There are four alternatives for the answer to every question. For each queStion :Or which a wrong answer has been given by the candidate, one-third (0.33) of the marks assigned to that question will be deducted as penalty.

(ii) If a candidate ｾｩｶ･ｳ＠ more than one answer, it will be treated as wrong answer even if one of the given answers happens to be correct and there wJl be same penalty as above to that question.

(iii) If a question is left blank, i.e. no answer is given by the can<idate, there will be no penalty for that question.

( DO NOT OPEN . THIS TEST BOOKLET UNTIL YOU ARE ｔｏｌｾ＠ TO DO SO )

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1.

2.

3.

4.

The radius of the tirst Bohr orbit of electrons

in hydrogen atom is 0.529 A. What is the

radius of the second Bohr orbit in singly

ionized helium atom?

(a) 1.058 A

(b) 0.264 A

(c) 10.58 A

(d) 0.0264 A

For which one o: the following materials,

is the Hall coefficient closest to zero?

(a) Metal

(b) Insulator

(c) lntrinsic semiconductor

(d) Alloy

Copper has a resistivity of 17 X lQ-9 Q m.

What is the end to end resistance of a copper

strip, 2 em long with cross sectional

dimensions 5 mm x 1 mm?

(a) 34 J.!O

(b) 68 J.!O

(c) 34mQ

(d) 68mn

At temperature of298 Kelvin, Silicon is not

suitable for most electronic applications, due

to small amount cf conductivity. This can be

altered by

(a) Gettering

(b) Doping

(c) Squeezing

(d) Sintering

2

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5.

6.

7.

The energy gap in the energy band structure

. of a material is 9 e V at room temperature.

The material is

(a) Semiconductor

(b) Conductor

(c) Metal

(d) Insulator

By doping Germanium with Gallium, the

types of semi-conductors formed are: •

1. Ntype

2. Ptype

3. Intrinsic

4. Extrinsic

Which of the above are correct?

(a) 1 and4

(b) 2and4

(c) 1 and 3

(d) 2 and3

An n-type of silicon can be formed by

adding impurity of:

1. Phosphorous

2. Arsenic ..

3. Boron •

4. Aluminium

Which of the above are correct?

(a) 1 and2

(b) 2 and 3

(c) 3 and4

(d) 1 and4

(Contd.)

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ｾＮ＠ According to Einstein's relationship for a

semiconductor, the ratio of diffusion

constant to the mobility of the charge

earners IS

(a) Variable and is twice the volt

equivalent of the temperature

(b) Constant and is equal to the volt

equivalent of the temperature

(c) Equal to two and is twice the volt

equivalent of the temperature

fd) Equal to one and is equal to the volt

equivalent of the temperature

S. Swept-out voltage in PIN diode happens

when PIN diode is

( c:.) Forward biased and the thickness of the

depletion layer decreases till 1-region

becomes free of mobile carriers

:b) Reverse biased and the thickness of the

depletion layer increases till 1-region

becomes free of mobile carriers

(:) Forward biased and the thickness of the

depletion layer increases till 1-region

becomes free of mobile carriers ·

(c) Reverse biased and the thickness of the

depletion layer decreases till 1-region

becomes free of mobile carriers

3 *

10. Consider the folk: wing statements related

to piezoelectric e::lect:

1 It ｧｩｶｾｳ＠ elecncal response in term; of

voltage ｣ｨ｡ｮｾ･＠ when mechanical stress

occurs in some materials

2. It gives mech3nical response in terms

of ､ｩｾｮｳｩｯｮ｡ｬ＠ change due to electrical

excitation of SoC me materials

Which of -:he above statements is/are

cor!ect?

(a) 1 only

(b) 2 only

(c) Neither 1 nor 2

(d) Both 1 ｾ､＠ 2

11. A 2-j)Ort Network is mown in figure. The

parameter ｾ Ｑ＠ for this r_etwork can be given

by

(a) <12

(b) +1/2

(c) -3/2

(d) +3/2

R

R

(Contd.}

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1 Ｒｾ＠

13.

14.

The four band colour code on a carbon

composite resistor is as follows:

First band colour Yellow

Second band colour Violet

Third band colour· Red

Fourth band colour Silver

The specification of the resistor is

(a) 35 kQ± 10%

(b) 4.7kQ±lO%

(c) 6.8 kQ ± 5%

(d) 46kn±2%

Which one of the following materials has -

temperarure coefficient of resistance very

::lose to zero?

''a) Manganin

(b) Nichrome

(c) Carbon

(i) Aluminium

The equivalent resistance between the points

A andD is

IOQ 1011 iOQ

1 wnf l

100 I c ｾｴｾｾＭＭｾﾷｾｾｾｶｾｾｮ＠

(a) 10 n (b) 20 n (c_l 30 Q

(d) 40 Q

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15. Seven resistances ead: of 5 n are connected

as shown in the figure. Tbe equivalent

resistance bet1;lf'een tbe points A and B is

50

sn

50

(a) 3 !.1

(b) 11 n (c) 15 n

r-----'IMI'·--.---o B

sn

50

sn

sn

(d) Nooe of the above

16. The capacitance of each ｣｡ｾ｡｣ｩｴｯｲ＠ is C = 3 J.lF

in the figure 3hown. The ;!ffective

capacitance between poin:s A and B IS

(a) 2 11F

(b) 3 J.lF

(c) 4 11F

(d) 5 11F

c

(2omd.)

..

I

i 1 I I

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ｾ＠ • I I I

17. V s = 5 cos t and the complex power drawn

is p = :; + 2j, the value of Rand L complex 2

respectively will be

R

+

3 4 (a) -and-

5 5

(b) 16 and!i '3 5

(c) 4 and3

(d) 3 and4

ｾ＠ 3. The complex :;>ermeability of ferrite at radio

frequency is given as

J.1 = J.1' _ j J.1 11• Here J.1 11 represents

(a) Relative permeability

(b) Relative permittivity

(c) Loss parameter

(d) Resistivity

·-19. The number of holes in an N -type silicon

with intrinsic value 1.5 x 1 0'0/cm3 and

11f 3 b . doping concentration of 10 em , y usmg

mass-action ｾ｡ｷ＠ is

(a) 6.67 x I CY'/cc

(b) 4.44 X :Q-25/CC

(c) 1.5 X 1 Q-24/CC

(d) 2.25 x 1 03/cc

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20. A tunnel-diode is best suited for

(a) Very low ｦｲ･ｱｵ･ｮｾｩ･ｳ＠

(b) 50Hz

(c) 100kHz

(d) Microwave freqtEncies

21. Small recovery time of a diode is most

significant for

(a) Line-frequency rectification

(b) Switching operations

(c) High-frequency rectification and

switching operations

(d) Low-frequency rectiticlftion and

switching operations

22. In JFET, when operated above the pinch-

off voltage, the

23.

(a) Depletion regiou becomes ｾｭ｡ｩｬ･ｲ＠

(b) Drain current starts decreasing

(c) Drain current remains Pf'actical!y

constant

(d) Drain current in:reases steeply

Thermal runaway is not possible in FET

because, as the temperature ofFET increases

(a) The drain current increase5

(b) The mobility of charg!:! earners

decreases

(c) The mobility of charge carriers

increases

(d) The transcondoctance incr...ases

{Contd.)

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24. Consider the following statements regarding 27. The zeners incorJorated within ｴｨｾ＠,-

an N-P-N Bipolar Junction Transistor: encapsulations of some MOSFETs are

1. Emitter diode is forward biased and meant for

collector diode is reverse biased (a) Reducing the cost

2. Emitter has many free electrons (b) Biasing the gate circuit

3. Free electrons are injected into base (c) Self-protecting the device against

and pass through collector transients

4. Depletion layers around junction J 1 (d) None of the abo\'e , and J2 of BJT are widened.

28. Which of the fol1owin5 magnetic materials Which of the above statements are correct?

has the highest reluctance? (a) 1, 2 and 4 (a) Ferromagnetic

(b) 1, 3 and 4 (b) Paramagnetic

ｾ｣Ｉ＠ 2, 3 and 4 (c) Diamagnetic

(d) 1, 2 and 3 (d) None ofthe above:

25. A freewheeling diode in a phase controlled 29. When UJT is used for triggering an SCR,

rectifier the wave-shape of the s :gnal obtained from

UJT circuit is (:t) improves the line power factor

(a) Sine wave (J) enables inverse operation

(b) Saw tooth wave (c) is responsible for additional reactive (c) Trapezoidal·wave

power (d) Square wave

(c) is responsible for additional harmonics 30. Darlington pairs are freq L ently used in ｾｩｮ･｡ｲ＠ .,

26. In a thyristor, the minimum current required ICs because, they

to maintain the device in the 'ON' state is (a) Do not require c::1y capacitors or

called inductors

(a: Latching current (b) Have enormous impedance transfor-

· mation capability cb: Ignition current

(c) Can be readily foroed/hooked from (c) Holding current two adjacent transiswrs

(d) Avalanche current (d) Resemble emitter fo2lower

6 (Contd.)

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J I. In aMOS capacitance fabricated on a P-type 34. Which of the following does not c:mse

semiconductor, strong ｾｮｶ･ｲｳｩｯｮ＠ occurs, permanent damage to an SCR?

when potential is (a) High current (a) Equal to Fermi level ("

High rate of rise of current (b)

(b) Zero (c) High temperature rise (c) Negative and equal to Fer:ni potential (d) High rate of rise of voltage

in magnitude

(d) Positive and equal to Fermi potential 35. The discrete LTI system is ｲ･ｰｲ･ｾ･ｮｴ･､＠ b:.r

in magnitude impulse response

32. A CMOS amplifier when compared to anN h( ll) ｾ＠ u-r U( ll) then the 3VS!ern is channel MOSFET has the adva_'ltage of

2 ' . i I

(a) Causal and stable I (a) Higher cutoff frequency ｾ＠ .

(b) Higher voltage gain (b) Causal and unstable ｾ＠

(c) Higher current gain (c) Non causal and stable

(d) Lower power dissipation (d) Non causal and unstable

33. Consider the following statements regardmg 36. In the first Cauer LC network, the first optocouplers:

element is a series inductor when the driving 1. Optocouplers are LED3 driving point function consists of a

photodiodes in a single J:ackage to (a) Pole at co = oo

provide electrical isolation between

input and output (b) Zero at co = oo

2. Optocoupler is LED c.nvmg a (c) Pole at co= 0

phototransistor in a single package that (d) Zero at co= 0 replaces pulse transformers working at

input zero crossing 37. Consider a complex exponential sequence

3. Optocouplers are used as temporary eiroo" with frequency m 0

. Suppose coo= I, then

non fixed joints between optical fibre (a) Such a sequence is periodic terminations

(b) Such a sequence is not periodic at all Which of the above· statements ｾ＠ correct? , (a) 1, 2 and 3

(c) Periodic for some value ofpe:-iod 'N'

(b) I and 2 only (d) Sonie definite range Nc, < n < N ･ｸｩｳｾｳ＠ llo

(c) I and 3 only for a periodic sequence

(d) 2and 3 only

7 (Contd.)

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38. Ideal low pass filter as a discrete time system is

(a) Causal, realizable

(b) Non causal, physically/computa-tionally unrealizable

(c) Non causal, physically realizable

(d) None of the above

39. Consider a continuous time system A, modeHed by the equation y(t) = t x(t) + 4 and a discrete time system B modelled by the equation y[n] = x2[n]. These systems are

(a) A-time invariant and B-timeinvariant

(b) A-time varying and B-time invariant

(c) A-time invariant and B-time varying

(d) A-time varying and B-time varying

40 Consider a discrete time accumulator system

y[n]= z::=-ao x[k] and the backward

difference system y[n] = x[n] - x[n- 1]

where x[·] represents the input and y[·]

represents the output of the individual

systems.

. x[n] Backward z[n] ... • AcauUalr ...

Difference ,.. ,.. ,.. System System

When these two systems are cascaded as in figure, the impulse response of combined

system with output z[ n] is

:a) Unit impulse sequence

t:b) Unit step sequence

(-c) Unit ramp sequence

(d) None of the above

8

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41. Measurement of pressure can be done by using wire, foil or semiconductor type Stra_n Gauges. The disadvantage of tl:e semiconductor type of Strain Gauge compared to the other two is in terms Jf

(a) Gauge factor

(b) Hysteresis characteristics

(c) Temperature sensitivity

(d) Frequency response

42. The Fourier series of a periodic function

ｾＨｴＩ＠ with a period Tis given by

43 .

L oo . jkw t X (k) e 0 , where ro = 2 n,T

k=-oo s o

and the Fourier coefficient X (k) is defined s

as,

If xit) is real a.nd odd, the Fourier

coefficients X5(k) are

(a) Real and odd

(b) Complex

(c) Real

(d) Imaginary

Consider a continuous time periodic signal x(t) with fundamental period T and Fourier series coefficient X[K]. What is the Fourier series coefficient of the signal

y(t) = x(t- t) + x(t + tj?

(a) 2 cos ( ｾ＠ Kt0 ) X[K]

(b) 2 sin ( ｾ＠ Kt 0 ) X[K]

( ) -t t

c e 0 X[K]+e 0 X[-K]

(d) e-1oX[-K]+e10 X[K]

(Contd.)

..

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<.

44. Consker the following transfer functions: 47. Consider two infinite duration ir.put

1 sequences {x 1[n], x.[n]}. When will the 1. jtO + 1

Region of ｃｯｮｶ･ｲｧ･ｮ｣ｾ＠ [ROC] of

1 Z-transform of their supe:-position i.e. 2.

Oro+ 1)2 {x 1[n] + x2[n]} be e::1tire Z plane except

1 possibly at Z = 0 or Z = oo? 3 ..

(jro + 1) Oro+ 2) (a) When their linear combination is of

The transfer functions which have a non finite duration

lkear pb.ase are: (b) When they are left sided sequences

(a: 1 and 2 only (c) When they are ｲｩｾｴ＠ sided sequences

(b: 1cmd 3 only (d) When their linear conbination is

causal (c) 2 and 3 only

(d) . 1, 2 and 3 48 . If the lower limit of Region of 2onvergence

(ROC) is greater than the upper limit of

45. A continuity equation is also called as fle ROC, the series X(Z) = I:=-00 x(n) z-n

law of conservation of (a) Converges

(a) · Ma;s (b) Zero

(b) Energy (c) Does not converge

(c) Charge (d) None of the above

(d) Power 49. For a random signal (cc·ntinuous time) x(t)

46. The basic structure of an avalanche defined for t ｾ＠ 0, its probability density

photodiode is function (pdf) at t = t

0 is such bat

(a) It is ｮｯｮＭｮ･ｧ｡ｴｩｶｾ＠ and ｾｴｳ＠ integral ·:a) p+- i- p-n+

equals 1

l:b) p+ -i- n+ (b) Need not be non-negative, but integral

I c) p+- p--n+ equals 1

(d) i-p- -n+ (c) It is non-negative, but inte-gral is not l

(d) None of the above

9 (Contd.)

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50. TI1e ｲ･ｾｮｳ･＠ of a system to a complex input

x(t) = ei21 is specified as y(t) = t · ei21 + e-j21•

n_e ｳｹｾｴ･ｭ＠

Ｈ｡ｾ＠ is :iefinitely LTI

(b: is :iefinitely not-LTI

(c) maybeLTI

(d) information is insufficient

ＵｾＮ＠ The rise time of the output response of a

low pass filter circuit when a step input is

applied will be

(a) Proportional to the band width

(b) Inversely proportional to the band

width

(c) Half the value of the band width

1 (d) r;- of the band width

"'Y"'-

52. Considef an LTI system subjected to a wide-

seMe sutionary input { x(n)}, which is a

white ncise sequence. The cross correlation

＼ｬ＾ｸｾ｛ｭ｝＠ between input x(n) and output y(n)

lS

(a) c:r2 h[m] X

(b) a h[m] X

(j2 (c) __x_h[m]

2

cr (d) _x_h[m]

2

where<l>xx[m] =a; o[m]and h[·] is impulse

response

53. For the active netwo::-k shown in figure, the

value ofV II is

I ｾ＠ =4

J vvv

+

v ｾｒ＠ = 6 ｾ［［Ｎ＠ I ( 21

-

,

(a) 20

(b) 2.40

(c) 3.60

(d) 100

54. In a discrete-time Low Pass Filter, the

frequency response is

(a) Aperiodic

(b) Aperiodic with response restricted to

(-ro.+ro) c c

(c) Periodic with pe::-iod 21t

(d) Quasi periodic with response

extending to infinity

55. For the R-L circuit shown, the current i(t)

for unit step input vohage will rist: to 0.63

in

v

1 H

Vi(t) ｾ＠-;;: 2 n :F

(a) 1 s

(b) 2s

(c) 0.5 s

(d) 1.5s

10 (Contd.)

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ｾＶＮ＠ In the circuit the value ofix is

2Q In

+ + +

10 v ( '

Ｒｩｾ＠

(a) 2A

(b) -0.6A

(c) 2.6 A

(d) 1.4A

57. \\-'hen the frequency of the applied voltage

(sine wave) across an inductor is increased

then the current will

(a) Decrease

(b) Increase

(c) Remain same

(d) Be zero

58. A series resonant circuit is tuned to 10 MHz

and provides 3-dB bandwidth of 100 kHz.

The quality factor Q of the circuit is

(a) 30

(b)

(c) 100

(d) 10

11

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59. In the figure, initid voltage •X c is v o"

Sis closed at t = 0. TheIL fort> 0 is

.---__ s_)<o----

+-i L _,

---r v I c oj I

I

(a) - W0

CV o sinO>) t

(b) ro V sin ro t 0 0 0

(c) - ro V sin ro t 0 0 0

(d) ro CV sin ro 1 0 0 0

where ｲｯｾ＠ = 1 ILC

60. A reduced incidence matrix ot .1 graph is

given by

0

1 [A]=r ｾ＠ -l -1 0 -1

0 1l 0 )

-1 )

The number ｯｦｰｯｳｾｩ｢ｬ･＠ trees i;

(a) 14

(b) 15

(c) 16

(d) 17

61. In a singly connected network .: there are b

Eer of branches and n number of n;)des,

he number of independent meshes M

dependent ncdes N are ｴｴｾ･｣ｴｩｶ･ｬｹ＠

(a) nand b

(b) b - n + 1 and n - 1

(c) b-n and b

(d) b + n - 1 and n + 1

(Contd.)

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62. For a symmetric lattice network the value

of the series impedance is 3 Q ｡ｮｾ＠ that of

the diagonal impedance is 5 Q, then the

Z-parameters of the network are

(a) ZII=Zzz=2QandZiz=Zzi=Y2Q

(b) zll = z22 = 4 0 and zl2 = z21 = 1 0

(c) Z 11 =Z22 =80andZ12 =Z21 =20

(d) Z 11 =Z22 = 160andZ12 =Z21 =4 0

63. Z-Parameters for the network shown in the

64.

figure are

1 II 8 12 2

I ) < I

VI v2

l ｾ＠1' 2'

(a) ZII=Z,Z22=Z,ZI2=Z21=Z

:h) Z11 = 11z, Z22 = 1/Z, Z12 = Z21 = 1/Z

ｾＺ｣Ｉ＠ Cannot be determined

lfy(s) = 1 + s, the network has 1 0 resistor

and

(a) 1 F capacitor in series I. (b) 1 F capacitor in parallel

(c) 1 H inductor in series

(d) 1 H inductor in parallel

ＶＵｾ＠ The solutions to many problems ir volving

electric fields are simplified by making use of equipotential surfaces. An equir:otentid surface is a surface:

12 ::1<

On which the potential is same everywhere

The movement of charge over such a surface would require no work_

1

4. The tangential electric field is zero

The normal electric field is ze10

Which of the above statements are correct':'

(a) 1, 2 and 3 only

(b) 1, 2 and 4 only

(c) 2, 3 and 4 only

(d) 1, 2, 3 and 4

66. A charge 'Q' is divided between two poi:lt cllarges. What should be the values of this caarge on the objects so that the force

between them is maximum?

(a) Q 3

(b) Q 2

(c:' (Q- 2)

(d) 2Q

67.. \V .J.at is the force developed per meterJe::1gth

be-:ween two current-carrying cond Jctors

10 em apart and carrying 1000 fi. anc.

15•)0 A currents, respectively?

(a) 3 N .

N (b)

3

(c) 2 N

N (d)

2

,(Ccntd.)

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68. .A practical de current sour•;e provides

2D kW to a 5(• Q load and 20 kW to a 200 Q

load. The maiimum power that can drawn

from it, is

(a) 22.5 kW

(b) 30.3 k\V

(c) 40.5 k\\.

(d) 45.0 k\\'

6i. If an ammeter is to be used in place of a

voltmeter, 'Ve must conne::t with the

ammeter a

(a) High resistance in parallel

( J) High resistance in series

(•;) Low resistance in parallel

(d) Low resistance in series

7:1. A point charge is located at origin. At point

(1, a), electric: field is E1• At ーｯｾｮｴ＠ (-a, a) the

electric field is E2 and at a poir:.t (-a, -a) the

electric field is E3

•

\Vhich one of the following is correct?

(b) I El X E:: I = 0

(::) Both E1 • E2 = 0 and I E1

:< E3 I = 0

(:i) NeitherE1 • E2 = 0 nor I E1

x E3l = 0

13

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71. Two point charges q1 = 2 f.LC and q2 = 1 f.LC

are placed at distances b = 1 em and

a = 2 em from the origin on the Y ar:.d X

axes as shown in figure. The electr_c :l.eld

ｶｾ｣ｴｯｲ＠ at point P( a, b) that will subter_d at.

ar_gle e with the X-axis is

. ' y

q1 f-------, P(a, b)

b

-+-----___JL_ __ _._ ... Ｉｾ＠

0

(a) tan e = 1

(b) tan9=2

(c) tan9=3

(d) tan e = 4

a

72. In a coaxial transmission line ( Er = l ), the

electric field intensity is given by:

E= 100

cos(109t-6z)u V/r:_ p p

Tie displacement current density is

100 (a) -- sin ( 109t- 6z) u A/m2

p p

116 (l:) p sin ( 1 09t- 6z) uP A/m2

0.9 (c) --sin ( 109t- 6z) u A/m2

p p

216 (c) -- cos ( 109t- 6z) u Aim: p p

(Contd.)

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73. Cor.:sider the following properties of electromagnetic waves:

1. These waves do not require any material medium to propagate

2. Both elec-:ric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagatior_ of waves

3. The energy in electromagnetic wave is divided eqt:.ally between electric and magnetic vectors

4. Both electric and magnetic field vectors attain the maxima and minima at the same place and same time

Which of the above properties of electromagnetic waves are correct?

(a) 1, 2 and 3 only

(b) l, 3 and 4 only

(c) 2, 3 and 4 only

(d) 1, 2, 3 and 4

74. Elect:-omagnetic waves are transverse in nature due to

(a) Reflection

(b) Diffraction

(c) Interference

(d) Polarization

dV 75. In a pnjunction diode, dT is equal to

(a) 2.3 mV/°C

(b) 3.5 mV/°C (c) 1 ).0 mVJOC

.(d) 12.5 mV/°C

76. A transmission line having a characteristic impedance of.50 Q is terminated at one end by j 50 n. The voltage standing wave ratio produced will be (a) oo

(b) +· (c) 1 (d) 0

77. In viscosity meters the quantity 1:1easmed

lS

(a) Buoyant force

(b) Frictional force

(c) Corio lis force

(d) Centrifugal force

78. The cut-off frequency of a rectangular

waveguide in dominant mode is 10 GHz.

The width of the wave guide is

14

*

(a) 2 em

(b) 1.5 em

(c) 1 em

(d) 2.5 em

79. A bistatic radar system shown in figure has

following parameters: f = 5 GHz, G dt = 34 dB,

Gdr = 22 dB. To obtain a return pcwer of

8p W the minimum necessary radiated

power should be

Target a = 2.L m2

,:,fi.J 1 ｾ＼ｄｯ＠

ｾ＠§

;:: Incident wave 4 km

" ｾ＠

T ransm;tt;ng ante .ma l Receiving ._3 km antenna

(a) 1.394kW

(b) 2.046kW

(c) 1.038 kW

(d) 3.46 kW

(Cootd.:'

•

I

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w. For the microwave antenna 84. Four independent ｯ｢ｾ･ｲｶ｡ｴｩｯｮｳ＠ recor.:led

(a) Shape only depends on the frequency voltage measurement of 110.02 V, 110.11 V,

range used L10.08 V and 110.03 V. The average range

(b) Size only depends on the frequency of error will be

range used (a) 110.06 v (c) Neither shape nor size depend on the (b) 0.05V

frequency range used (c) ± 0.045 v -

(d) Both shape and size depend on the (d) ±0.9V t

frequency range used 85. A 1 kQ resistor with an accuracy of± 10%

81. ll1e antenna efficiency of a A./8 long dipole carries a current of 1 0 rnA. The current was

antenna is 89.159 %. The equivalent loss measured by an analog ammeter on a 25 rnA

range with an accuracy of ± 2%. The resistance of the antenna is

accuracy in calculating the power dissipated (a) 1.5 n in the resistor would be

(b: 15 n (a) ±4%

(c) 12.33 n (b) ± 12%

(d) 125 n (c) ± 15%

82. A small elemental wire antenna is excited (d) ±20%

with a sinusoidal current of frequency 86. Consider the following statements regarding 1 MHz. The induction field and radiation error occurring in current transformer:

field are at equal distance d from the 1. It is due to the magnetic leakage in antenna. The value of d will be nearly secondary winding.

(a) 300m 2. It is due to power consumption in the

(b) 50m metering circuit

(c) 150m 3. It is due to the exciting mmf ｲ･ｱｵｩｲｾ､＠

(d) 20m by the primary winding to produce flux

4. It is due to the non-linear relation

83. Ernr caused by the act of measurement on between flux density in the core and

the physical system being tested is magnetizing force

(a) Hysteresis error Which of the above statements are correct?

(b) Random error (a) 1, 2, 3 and 4

(c) Systematic error (b) 1, 2 and 4 only

(d) Loading error (c) 2, 3 and 4 only

(d) 1, 2 and 3 only

15 (Conk.)

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16

* (Contd.)

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r '

95. A sinusoidal waveform has peak-peak 97. Which of the ｦｯｬｬｯｷｾｮｧ＠ tlow meters is

amplitude of6 em viewed on a CRO screen. capable of giving the rate of flow as well as

ｾ＠ The vertical sensitivity is set to SV /em. The the total flow?

RMS value ofthe signal is (a) Nutating disc flow meter

(b) Electromagne::.c flow meter (a) 15 v

Orifice meter (c)

(b) 12.6 v (d) Lobed impellt!t flow :neter

(c) 21.2 v 98. Which of the follow:.ng tyres oftransducers

(d) 10.6 v can be used for ｾ＠ measurement of the

angular position of a shaf:? }6. Consider the following types of digital

1. Circular potenti:>meter

voltmeters: 2. LVDT

1. Ramp type 3. e-pickup

2. Dual slope integrating type 4. Synchro pair

3. Integrating type using voltage to (a) 1 and2

frequency conversion (b) 2 and3

(c) 1 and4 4. Successive approximation type

(d) 3 and4

5. Servo balanced potentiometer type 99. Which one of the following plays an

Which of these require a fixed reference important role ir1 th; fine recording of audio

voltage at the comparator stage? signals on magr,ef"L: tape recorder?

(a) 1 and 2 only (a) Width of the air gap of the recording

head (b) 3, 4 and 5 only

(b) Thickness •)f ﾷｴｾＱ･＠ tape used for (c) 2 and 3 only recording

(d) 1, 4 and 5 only (c) Material of the ｲｾｯｲ､ｩｮｧ＠ head

(d) Speed ｯｦＺｾＱｾ＠ mot·)r

17 (Contd.)

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1 00. A ｲ･ｾｩｳｴ｡ｮ｣･＠ strain gauge with a gauge factor

of 3 is fixed to a steel member subjected to

a stress of 100 N/mm. The Young's modulus

of steel is 2 x 105 N/mm2•

The percentage change in resistance is

(a) 0.1%

(b) G.l5%

(c) 1.0%

(d) 1.5%

101. If a system produces frequencies in the

output that are not present in the input, then

the system cannot be

(a) Minimum phase system

(b) Linear shift invariant

(c) Stable and causal

(d) Stoole and linear

1 02. In eddy current damping system, the disc

err.:ployd should be of

(a) Cor_ducting and magnetic material

(b) Corxlucting but non-magnetic material

(c) Magnetic but non-conducting material

(d) Non-conducting and non-magnetic

material

1 ｾＳＮ＠ Whichofthe following can act as an inverse

transducer?

(a) LVDT

(b) Strair_ Gauge

(c) Piezo electric crystal

(d) Bimetal strip

18

*

104. Which one of the followi.ng thermocouple

pairs has maximum se.1sitivity around

273 K?

(a) Nichrome-constantan

(b) Copper-Nickel

(c) Platinum-constantan

(d) Nickel-constantan

105. Maximum power will be ddivered from an

ac source to a resistive load in a network

when the magnitude of the source

impedance is equal to

(a) Half the load resistance

(b) Double the load resistance

(c) The load resistance

(d) Zero

106. The de resistivity and permeabJity exhibited

by a type 1 superconductor are respectively:

(a) Zero and zero

(b) Zero and unity

(c) Unity and zero

(d) Unity and Unity

(Contd.)

•

I

ｾＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭＭ ｾ＠

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Directions: -

Eaeh of the next Fourteen (14) items consists of

two statements, one bbelled as the 'Statement (I)'

an.C the other as 'Statement (II)'. Examine these

two statements carefully and select the answers

to these items using the codes given below:

Cedes:

Ｈ｡Ｚｾ＠ Both Statement (I) and Statement (II) are

individually tn:e and Statement (II) is the

correct explanation of Statement (I)

(b) Both Statemen-: (I) and Statement (II) are

individually true but Statement (II) is NOT

the correct explanation of Statement (I)

(c) Statement (I) is true but Statement (ID is

false

(d) Statement(!) is false but Statement (II) is

true

1 0/. Statement (I) One of the mechanisms

by which a transistor's

usefulness may be

terminated, as the

collector voltage is

increased, is called punch

through.

Statement (II) Punch through results

from the increased width

of the collector-junction

transition region with

increased collector-junction

voltage.

19

*

108. Statement (I) In ferroelectric materials, domains with perma_1e:nt electric dipoles may ·Je created that would align along external electric field.

Statement (II) Ferroelectric materials undergo phase trans-formation of symmetric to asymmetric structure bekw a critical temperature.

1 09. Statement (I) Conduction takes place in an enhancement MOSFET only for gate voltages below the threshold level.

Statement (II) In an enhanceme::1t MOSFET, a channel •Jf semiconductor of the same type as the source and drain is induced ir_ the substrate by a posi:ive voltage applied to the gate.

11 0. Statement (I) . MOSFET is a field effect transistor whose drain current is controlled by the voltage applied at the gate.

Statement (II) MOSFET is an insulated gate FET.

111. Statement (I) All passive components can be fabricated in a single chip.

Statement (II) As opposed to disc::-ete circlits where all compor.ents are separately inserted and connected, in c..n integrated circuit, the) are simultaneously created on a chip of semiconductor material during manu-facturing.

(Contd.)

I - I

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112. Statement (I) The total energy of an

energy signal falls

between the limits 0 and oo.

Statement (II) The average power of an

energy signal is zero.

113. Statement (I) Sinusoidal signals are

used as basic function in

electrical systems.

Statement (II) The response of a linear

114. Statement (I)

system to a sinusoidal

input function remains

sinusoidal.

Dirichlet's conditions

restrict the periodic signal

x(t), to be represented by

Fourier series, to have

only finite number of

maxima and minima.

Statement (II) x(t) should possess only a

115. Statement (I)

. finite number of dis-

continuities.

Ferrite cored coils are

used in high frequency

tuned circuits.

Statement (II) Ferrite cored coils have

high Q as compared to

iron-cored coils.

20 *

116. Stalement (I) A cylindrical conductor of

rarlius R carries a current

I. The magnetic ｦｾ･ｬ､＠

intensity within the

conductor mcreases

linearly with the radia_

distance r < R.

Statement (II) The current enclosed

11 7. Statement (I)

increases as the square of

the radial distance while

the circumference increases

linearly with the ｲ｡､ｾ｡ｬ＠

distance.

Hall voltage is given by

I.H V H = R H - where I is

t

the current, H is the

magnetic field strength,

tis tte thickness of probe

and RH IS the Hall

constant.

Statement (II) Hall tffect does not sense

the carrier concentration.

118. Statement (I) For e-n energy meter,

careful design and

treatment of breaking

magnet during its manu-

facture are essential in

order to ensure con-

sistency of break magnet

during the use of meter.

Stateoent (II) Steady ::-otational speed of

energy meter disc is

directly proportional to

flux of the break magnet.

(Contd.)

•

•

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[

J

,.

119. Statement (I) If the limiting errors of

measurement of power

consumed by and the

current passing through a

resistance are± 1.5 % and

±1.0% respectively, then

the limiting error of

resistance me:tsurement

will be ± 2.5 %.

Statement (II) Mathematically iff= xyz

Then tJ.f = (flx)yz +

x(fly)z + xy(flz)

21

*

120. Statement (I) Integrating DVM rr_easures

the t:-ue average value of

the input voltage over a

fixed measuring ｾｲｩｯ､Ｎ＠

Statement (II) Since the display of

measured signal is a

decimal numbn, be

errors due to paraB.ax and

observation error are

eliminated.

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SPACE FOR ROUGH WORK

22 *

1

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"

SPACE FOR ROUGH WORK

23

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SPACE FOR ROUGH \VORK '

24

*

..

..

I

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DO NOT OPEN THIS TEST BOOKLET liNTIL YOU ARE ASKED TO DO SO

T.B.C. : B-GTD-0-SAB Test Boo::det Series

Serial

TEST BOOKLET

ELECTRONICS & TELECOMMUNICATION EJ\-GINEERING Paper II

Time Allowed : Two Hours Mcximum Marks: 200

INSTRUCTIONS 1. IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION, YOU SHOULD CHECK THAT

THIS TEST BOOKLET DOES NOT HAVE ANY ill.J"PRINTED OR TORN OR ｍｉｓｾｉｎｇ＠ ｐａｇｅｾ＠ OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST BOOKLET.

2. Please note that it is the candidate's responsibility to encode and iill in the Roll ｎｵｭ｢ｾｲ＠ and Test Booklet Series Code A, B, C or D carefully and without any omission or discrepancy at the appropriate places in the OMR Answer Sheet. Any omission/discrepancy will render the Answer Sheet liable for rejection.

3. You haYe to enter your Roll Number on the Test Booklet in the Box provided alongside. DO NOT write anything else on the Test Booklet.

4. This TBst Booklet contains 120 items (questions). Each item comprises four responses (answers). You will select the response which you want to mark on the Ansvver Sheet. In ｣｡ｾｅＬ＠ you feel that there is more than one correct response, mark the response which you consider the best. In any c3.se, choose ONLY ONE response for each item.

5. You have to mark all your responses ONLY on the separate Answer Sheet ;>rovided. SeE directions in the Answer Sheet.

6. All items carry equal marks. 7. Befo:':'e you proceed to mark in the Answer Sheet the response to various iterLs in the ｔ･ｾｴ＠ Booklet,

you have to t'ill in some particulars in the Answer Sheet as per instructiom sent to you with your Admission Certificate.

8. After you have completed filling.in all your responses on the Answer Sheet a:1d the exami::lation has concluded, you should hand over to the Invigilator only the Answer Shee!. You are pErmitted to take away with you the Test Booklet.

9. Shee:s for rough work are appended in the Test Booklet at the end. 10. Penalty for wrong answers :

THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE. (i) There are four alternatives for the answer to every question. ?or each question :fer ｷｨｩﾷｾｨ＠ a wr:mg answer has been given by the candidate, one-third (0·33) of the marks assigned to ｴｾＱＮ｡［Ｚ［＠ question will be deducted as penalty. (ii) If a candidate gives more than one answe-r, it will be treated c..s a wrong answer even if one ･ｾｦ＠ the given answers happens to be correct and there will be same penalty as aoove to that q.1estion (iii) If a question is left blank, i.e., no answEr is given oy the candidate, there wii be no penalty for that q"L:.estion.

DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE ASKED TO DO SO

B-GTD-0-SAB ( 1- A)

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2.

3.

A transistor uses potential ､ｩｾｩ､･ｲ＠ 4.

method of biasing. R1 = 50 kQ, R2 = 10 kQ and

RE = l kQ. IfVcc = 12 V and VBE = 0·1 V,

then Ic is

(a) 19 rnA

(b) 2 mA

(c) 1·9mA

(d) 0·19 rnA

ｾｾ＠ fi ｾ＠Cor_t:ioluer the ollowing statements in the

con-:.E:d of the conditions needed to ｯｰ･ｲ｡ｾ･＠ a

BipJJar .:""unction Transistor (BJT) in acLive

regio::-_ in a linear circuit :

1. The emitter diode must be forward biased.

2. rhe collector diode must be reVH'Se Jiased.

3. The voltage across the collector di·)de must be greater than the breakd(J.vn vol:age.

4. The voltage across the collector dicde must be less than the breakdoFVn ,·oltage.

Whicl: of the above statements are correct ?

(a) I, 2 and 3 only

(b) l, 3 and 4 only

(c) :1, 2 and 4 only

(d) ｾ＠ 2, 3 and 4

An FE:::'-input IC operational amplifier has an

open k<>p differential gain of 1,00,000 and a

commrn mode gain of 25. Then the commc:-n

mode rejection ratio is

(a) 4(3 dB

(b) 7"2 dB

(c) lDfdB

(d) ＱｾＴ＠ dB

6.

B-GTD-0-SAE ( 2-A)

In biasing of BJI, -:.he slope of load line can be

calculated usirg

(a• Operating ha:se .:urren-:,

:b ｾ＠ Operatii15 co: lector current

:c) Operatin5 :r:·o_nt ﾷｾｯＭｯｲ､ｩｲＺ｡ｴ･ｳ＠

·d: Minimum a.:1d Taxirr_um YE.kes of

collector current

:::..e3.kage curre:::r: cppto:ximately ooubbs for

every 10"C incre&se in temperature of a

Eilicon transistJ:r. If L sJicon trarsistcr has

lcEo = 1000 nA E.t 3lf C, wr_at is its lwkage

rurrert at 90°C ?

( 3.) ＳＲｾ＠

(J) ＶＴｾ＠

ＨｲｾＩ＠ ＺＺＮＶｾ＠

(d) ＱＲＸｾ＠

ｖｬｨｾ｣ｨ＠ of the >oJo¥. i::1.5 statements are

correct?

1 leo for ge-r::ll.3.nh::-r. is much 51"28 ter

2.

3.

ta:

:b;

:c)

I: d)

tnan for ｳｩｪＬｾｯｮＮ＠

'The steady·E>tate tEmperature ｮｾ･＠ at the collect•}T jLnc::ion is propo::iion2.l to the power dissipa\.3d at the jun:.ti•Jn.

To aYoid thf'm.al ::-unaway the required condition is b.at L1.e rate at which heat is released at the ｣ｊｾＸ｣ｴｯｲ＠ junction must exceed the ra:e at --cvbch the heg,t can be dissipated urder stea.d:r-E.tate conditions.

1, 2 and 3

2 and 3 ｯｮｬｾ＠

1 and 3 onl!

1 and 2 only

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7. "Lpper 3 dB tut-off of common emitter 10. The ＺＱＭｰ｡ｲ｡ｭ･ｾ･ｲｳ＠ cf aCE amplifier feedi:J.g a

8.

9.

a:nplifier depends on load of 10 kn ｡ｾ･＠ h:8

= ::._ kn, hre = 50, hre = ),

(E.) E-B junction capacitance

(l:) C-B junctiJn capacitance

(c) Capacitan:::es ofbothjunctions

;d) Coupling capacitor capacitance

ｾｯｮｳｩ､Ｍ］ｲ＠ the following statements in respect

o)f an R-C coupled transistor amplifier :

and 1/fL.,e = 40 lill. r:1e vdtage gain wou:d

be

(a) -40

(b) - 10)

(c) - 40r)

(d) - 501)

The low frequency response is

d;:,termined by the transistor junction ll. capacitors.

Which of the following i8 the ーｲｩｮ､ｰ｡ｾ＠ facto::

that cont::ibutes t) tLe doubling of the

conve:-sion effici·:mcy in a transformer coupled

ampli:ier?

<o .....

r .: .

4.

The high frequency response is limited b? coupline capacitors.

ｔｾＭｾ･＠ Miller capacitance reduces the gain at high frec:uencies.

As the gaiL is increased the bandwicth gE-ts reducej.

Which of the aboYe statements are correct?

(a) 1 and 2

(b) 2 and 3

(c) 3 and 4

(c.) 1 and 4

T:1E" transfer fun:::tion of any stable system

wh:)ch has no zero;; or poles in the right half Jf

tl:e s-plane is said to be

(a) Minimum phase transfer function

(bl Non-minimum phase transfer function

Cc: Mi:.:imum frequency response function

(dt Minimum gain transfer function

(a) Redocing ｾｨ･＠ po'<Ver dissipated m thE

:rans::istor

(b) Ｓｬｩｭｩｮ｡ｴｩｾ＠ the p:Jwer dissipatio:1 m

-:he transfocme::

(c) 3limination of de power dissipated in

the load

(d) lmpedance mat:r:hin5 ofC1.e transformer

12. A power ｡ｲｲ｟ｰｬｩｦｩ･ｾ＠ op8ratEd from 12 V battery

gives an ｭｴｰｵｾ＠ of 2 711. The maximmn

collectc•r current in tlB circuit is

(a) 166·7 ..tA

(b) 166·7 ::nA

(c) 136·7 .\

(d) 13·67 rnA

8-GTD-0-SAB (3-A)

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13. The sele:::tivity of tuned radio frequency (TRF) 15. An cp;:-rational ｡ｭｰｬｩｦｾ･ｲ＠ )Ossesses

rec8 ｾｶ･ｲ＠ is poor because

1. Q-factor requirement of tuned circuits

in RF amplifier is not fixed.

2. Q rnquired for upper side of short WEve

is 2)00.

3. Q-fE..ctor is zero.

Which of the above statements are correct ?

(a) 1, 2 :1nd 3

(b) 1 ani 2 only

(c) land .3 only

(d) 3 only

14. Consid.er the following statements ｰ･ｲｴ｡ｩｮｩｮｾ＠

to fnquency response of RC coupled

amplifi?r:

1.

2.

3.

C-oupling capacitance affects high

f:rnqurncy response.

capacitance

freque::1cy response.

C<rupli:1g capacitance

frequency response.

affects higt

affects low\

(a: Very large inpLt ::-esistance and ver:r ;arge output resi:;ta:J.ce

(b) 1lery large input resistar. ce and very-

Emall output resi:;tac'lce

(c) Very small input resistance and Yery

small output resistance

(d) Very small inpu-; nsistan·:::e and very

l2rge output resis-;ance

16. A povrE-r supply uses bridge re::::tFier ｷｾｴｨ＠

capaci:ar input filter. If one of the :liodes is

defeetive, then

1. Tr.e de load voltare will be lover than i-;s expected value.

2. I\.ipple frequency vill be lower than its

3.

･ｾ＼ｰ･｣ｴ･､＠ value.

The surge curr:mt will ｾＮｮ｣ｲ･｡ｅ･＠

n:anifold.

\Vhich cf the above statements are correct ?

(a) 1 md 2 only

(b) 1 and 3 only

(c) :1 ar.d 3 only

(d) :.., 2 and 3

17. In an =.-3Ection filter, a b:loeeder resistE..nce is

4. B:r.;mss capacitance affects low connec::ed ＮＺｾＮ｣ｲｯｳｳ＠ the load to

frequency response.

"Nhich o:'the above statements are correct?

(a) 1 End 2

:0) 3 and 4

lo:::) 2 ar.d 3

(d) 1 and 4

E-3TD-O-SAB ( 4-,:..)

(a) Provide good regulation for all -.ralues of /

lc.ad

(b) E::1311::-e lower PIV of L1e diodes

(c) Ens .1re lower values of capacitance m

tl:l.B ｾｩｬｴ･ｲ＠

(d) REduce ripple content

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18. A full wave rectifier uses 2 diodes. Th:J 21. Cmsidtr the following stc..ten:E:c.ts :

interm.l resistance of each diode is 20 n. The

transfJr:ner RMS secondary voltage from .

centre ta;> to ec.ch end of secondary is 50 V

and the load resistance is 980 n. Mean loaC.

current will be

(a) 45 A

(b) 4·5 A

(c) 45 mA

(d) ｾＶ＠ 11A

19. In a ＿ｯｾｴ｡ｧ･＠ regulator, zener diode is

1. Connected in series with filter output.

2. Forward biased.

A 3ch.Jttky diode :s incbded when a tra:lSistor is fabricated so as tc

1.

2.

3.

4.

Prevent the tn .. nsistor from :l:.ll s3.turation.

Eliminate saturE.titm ､Ｘｾ｡ｹ＠ time..

Achieve better swvitching speed.

REduce thermal stabilit?.

W_nch of the above stc.temerrt3 are co::-red ?

(a• =.., 2 and 4 only

·:b) =-, 2 and 3 only

(e • :2, 3 and 4 only

(:J) L, 2, 3 and 4

3. Connected in parallel with filter outpn:. 22. '='te transistors T1

ar_d r2

shown in ｾｨ･＠ ｦｾＮＱｲ･＠

4. Reverse biased. h3ve 3. threshold voltage of 1 volt. The d-eYice

ｗｨｩｾｨ＠ cfthe above are correct?

(a) 1 and 2

(b) 3 an6 4

(c) 1 and 4

(d) 2 and 3

20. For c.n OP-Amp phase shift oscillation, the

frequency of oscillations is

(a) 1

2rc R C

(b) 1

(c) 1

2rc R C J6

(d· 1

2nR C fs

B-GTD-0-SAB (5--A)

Jeraneters K1 and I-:2 cf T1 ani ?2 are

ｾ＠ !lA/V 2 and 9 11A/V2 :respecti,..ely. The

x.tpLt voltage V0

is nearly

5

Tl v

0

Tz

ｾ＠I

j_

(a) 1 V

tbl 2V

rc) 3 V

:d) 4 v

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On simplification of expression

Y =(A· B- C)(A + B +C), using Boolean

algebra, the S<>lution is

(Et) (A· B +C) (A+ B ·C)

(b) (A + J:; + C ) (A+ B + C)

(::) (A • B + C )(A • C + B )

(d) (B • C + A ) (A· B + C )

ｾＴ＠ '::'he large sifUal bandwidth of an operational

amplifier is limited by its

(a) CMRR

(b) ｓｾ･ｷ＠ rc..te

(c) Gain-bandwidth product

(d) Input i::npedance

25.. The minimum number of gates requ:red to

realize the function AB + C (using ｾａｎｄ＠

gates only) is

Ca) 2

<b) ;3

<c) 4

td) 6

2-3. 'Nhat i3 the correct sequence when tl-.e logic

families lTL, ECL, IlL and CMOS are

arranged ir: descending order of fan-out

eapab:lities ?

1 a) CMOS TTL, ECL and IlL

1b) IIL, TTL, ECL and CMOS

t c) IIL, ECL, TTL and CMOS

td) CMOS. ECL, TTL and IlL

27. K-map method of simplifl.:::ation c3.n be

applied when the gi·,.,en functic•n :E _n

(a) Product of rum form

(b) Sum of product form

(cl Canonical fJrm

(d) Anyform

28. If the inve:ting :nput termir..al of an

operational amJ:lifi.ET is grou::Ded and a

si::msoidal voltag8 waveforn is c..pj:Led at the

non-inverting inr·ut termin1l, tl:E out:r;ut will

be

(a) Square na...,e

(b) Triangular wav-e

(c) Half-wave rectified si11e we..\ e

(d) Full-wa-.re recti=ied sir_e wa'V'E

29. T.:1e function Y = A + B · C in c c..nanical sum

of product for:n ｩｾ＠

(a) Y = ｾ＠ 1, 3, 5, .J, 7

0:) y = ｾ＠ 1, 4, 6, 6, 7

(c) Y = ｾ＠ 2, 3, 5, 3

(C.) y = ｾ＠ 2, 3, ,), 7

30. ｔｾ＾･＠ correct in.strnciicon exerutioL Ｓｾｱﾷｊ･Ｚｮ｣･＠ is

31.

(a) ExecutE, DBcode and ?e:cb

(b) Fetch, Execute and ｄＸ｣ｾｅ＠

(c) ExecutE, Fetch and D8cetdE

((_) Fetch, Dec<•de and ExzntE

A l-_alf adder can be cJnstru.:::ted -B_n:g

(c..) One XOR md one C·R gc..tE -nth their outputs cor_nec::ed in :Ja!'alle:

(b) One XOR md one C R gc..tE -nth their outputs cor_nected in series

(c) One XCR ｧ｡ｴｾ＠ 3.nd one AND gne

(d) Two XJ'.-OR ga.tes only

B-3 fD-0-SAB ( 6 -A)

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32. Fc•r an SR flip-flop, Sand Rare made ･ｱｵ｡ｾ＠ to 35. Wh:lt is the frec_1.:en_--y Jf the :mtput Q for the

1. -wl:at is the value ofQ?

(a: Unchanged

Ｈ｢ｾ＠ Clear to 0

:c) Set to 1

' d) [ndeterminate

33. Which of the following statements are

cocect ?

34.

l.

2..

3.

A magnitude comparator is a sequential circuit that compares 2 numbers.

!. decoder with enable input can fmction as a demultiplexer.

The number of AND gates in a 32-to-1 :.ine multiplexer is 32.

4 The number of 3 x 8 decoders requirej to realize a 6 x 64 decoder is 8.

(a) ｾＮ＠ 3 and 4 only

(b) l, 2 and 4 only

Cc: 1, 3 and 4 only

(:l• 1., 2, 3 and 4

The nu::nber of branches of the root loci of the

equa1.io_'l s (s + 41 (s + 5) + K (s + 2) = 0 is

(E) 2

(l:) 3

(cl 4

(dJ 5

ｷ［Ｂｬｾｮ＠ K varies from - oo to + oo.

eire :.Iit shown in be figme ?

Ou - Q tput

CLCCK D Type FF

CL.K ｾ＠r------'

:a) '.::'wice the input ::leek frequency

•:h) H&lfthe in:p.:t ｣｢｣ｾＭ｣＠ frequncy

tc) Sa:ne as thE- :n}Xlt ::.bck f::-equemy

<d) InYerse of the p::-opEgation dela-y of the fi}:-flop

36. Four memory chips of 16 >: 4 sizes have their

addresE buses ＺＺｯｮｵｾ｣ｴ･､＠ together. This

system wJl be of s:ze

37.

(a) 64 > 4

(b) Ｓｾ＠ X 8

(c) lE :< 16

(d) 2&6 X 1

The time required for the ste}: resprnse to

decrease and stay w: thin a sr:ecified

percen-;agE of its final valu:: is called

Ca: Detay time

(b) RiEe time

(c) Lag time

(d) ｳｾｴｴｬｩｮｧ＠ time

8-GTD-0-SAB ( 7 -A)

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38. A c::>L•l'erter type 8-bit ND converter is dri-.ren 41.

by a 500 kHz clock. What are the maxioum

COuTts, average conversiOn time and

maxicum conversion rate respectively?

(a) 256 counts, 200 x 10-6 sec and

1000 conversions/sec

(b) 256 counts, 256 x 10-6 sec and

1953 conversions/sec

WhE!ll the unit impuL-e respo:.se of a second 1

order system is -=- e-C-Bt si:l. (}6t. the natural 6 .

freq·.1ency and dc..mpi::lg ratic of the system

are -:-espectively

(a) 1 rad/s a:1d )·8

(b) 0·64 radts a:1d Q-8

(c) 1 rad/s and 1

(d) 0·64 ra<Ls and 1

(c) 128 counts, 256 x 10-6 sec and

1200 conversions/sec 42. The second-orcer systerr_ defined by

(d: 128 counts, 200 x 10-6 sec and

1000 conversions/sec

39. The speed of conversion is maximum in

(a) Successive approximation ND conYerter · 43

•

(l:) Parallel comparative ND converte:·

(c) Counter ramp ND converter

(d) Dual slope ND converter

2

25 is given a st:Jp input. The time

s + 5s + 25 tak3n for the output tJ set-:le ·.;.rithin ± 2% is

(a) 1·2 s

(b) 2s

(c) 1·6 s

(d) 0·4 s

A 4-bit m•)ddo-6 ripple counter uses J-f: Jip-flops. If the ーｲｯｰ［Ｚ［ｧ｡ｴｾｯｮ＠ delay of each fli:r•-tlop is 50 ns, th:J maximum clock ｦｲｾｵ･ｮ｣ｹ＠ thc:t can b:c used is

(a) 5 MHz

(b) 6·95 MHz

(c; 10 MH;:

Cd: 20 MH::-:

44. TI-_e ｦｯｬｬｯｷｩｾ＠ ｅｗｩｴ｣ｾＱＮｩｮｧ＠ fur_ctions are to be ｩｾ･ｭ･ｮｴ･､＠ using:; DecJdtr:

40. b an 8-bit D/A converter, the ref:rrence

volt9.ge used is 10 V. What voltage is

rerresented by 1010 0001?

(3.) 0·00:392 v

(b) 6·314 v

(c) 6·288 V

(d; 5·814 v

8-GTCt-0-SAB ( 8-A)

f1 =I m (1, ｾＬ＠ 4, 8, D, 14l

f2 = I m (2, E, 9 11)

f3 = I m (2, L:o, 5. 6, ':)

ThE minimLm configuratic:1. of the decoder sr_oold be

(a) 2 - to - 4 ltnes

(l:) 3 - to - 8 lines

(c) 4- to- 16 lines

(C) 5 - to - 32 linE3

I

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45.

46.

T::::-ansistcr is in saturation when

(a) IB = Ic

Ic (b) IB>-ｾ､･＠

(cl I8 = 0

Ic (d) IE<-. ｾ､･＠

The effeds of feedback on stability and

sensitivit: are

(al Negative feedback improves stabLity and system response is less sensitivE'" to extErnal inputs and parameter variations

(bt

Cc:

Feedback does not affect stability but systEm response is insensitive to disbrbances and parameter variatior_s

Feedback does not affect stability ｾｮ､＠systzm response is sensitive to disbrbances and parameter variations

(d• Neg-3-tive feedback affects stability and ｳｹｳｴｾｭ＠ response is more sensitive :o disturbances and parameter variations

47. W";1.ich of ｾｨ･＠ following techniques are used to

de:ermine relative stability of a closed lc·op

linear sys1 em ?

1. Bode plot

2. Nyq.1ist plot

3. Nicl:ol's chart

4. Rouih-Hurwitz criterion

(a) 1, 2 and 4 only

(b) 1, :3 and 4 only

(c) 1, 2 and 3 only

(d) 1, 2, ;3 and 4

48.

49.

50.

51.

8-GTD-C·-SAB •3-A)

A 4-l:it D/A convertEr gives m output -,oltage

of 4·E V for an input cede of 1001. The ootput

ｶｯｬｴ｡Ｓｾ＠ for an input eoce ofCllO is

(a) 1·5V

(b) 2·0V

(c) 3·0V

(d) 4·5V

Given that ｴｨｾ＠ trar_sfer f-:::r_ction

G(s) = 2

K , the type md orcer of this s (l+sT)

system are respectively

(a) 5 and 2

(b) 2 and 2

(c) 2 and 3

(d) 3 and 3

The feedback ｳｹｳｴｾｭ＠ with charac:eristic

equation

s4 + 20Ks3 + 5s!< + lOs + 15. = C• :s

(a) Stable for all vE..luzs oC{

(b) Stable for ｰｯｳｩｴｾｶ･＠ ｶ｡ｬｵｾｳ＠ ofK

(c) S:able for 7·0 < K < =

(d) Unstable for any Yalue ::>f K

The BC)de plot of the transfer fLil..Ction

G(s) = s is

1. CJnstant magn_turle

2. 20 dB/decade

3. ::;Jnstant phase sl:ift ar:gle

4. ::;.Jnstant phase sl:ift of n./2

Which cf these are corred ?

(a) 1 and 3

(b) Land 4

(c) 2 and3

(d) 2 3.nd 4

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E2. ｔｨｾ＠ oscilhtion frequency of the system with 56. The rootE of the ｣ｨ｡ｲ｡｣ＺＬ･ｲｩｳｴｩｾ＠ equation

the ｣ｨ｡ｲ｡､ｾｲｩｳｴｩ｣＠ equation 1 + G(s) H:s) = 0 are the same as the

s6 + 2& 5 + 3s4 + 4s3 + 3s2 + 2s + 1 = 0 is

(a) + 1 ndian/sec

Cb: - 1 radian/sec

(c-, j1 r&dian/sec

(c) -: 1 radian/sec

53. 'The clc sed loop transfer function cf a unity

5-1.

55.

negatiYe feedback system is 100

. lt3 s2+ 8s+100

Jpen loop transfer function is

(a) 100

s+8

(b) 1

32+8s

(c) 100 ---

s2- Ss

(d) 100

s2+8s

The Laplace transform of e-2t sin 2ffit is

(a-, 2s

(s + 2)2 + 2ffi 2

(b) 2ffi

(s-2)2 + 4ffi 2

(::!) 2ffi

(s-"-2;2 +4ffi 2

:<D 2s

(s-2)2 + 2ffi 2

In a closed loop system for which the output is the speed of a motor, the o·J.tput rat.:: control

can be used to

:a) Limit the speed of the motor

(b) Limit the torque output of the :notor

(c) Reduce the damping :>fthe system

(d) Limit the acceleration of the motor

B-G-:-D-0-SAB

(a) PolEs of the ｣ｬ｣ｳｾ､＠ .oo-;• transfer fur.ction

(b) PJles of the ope:1loop transfer functi@

(c) Zeros of the closed lC()p tn.nsfec fJ.rc'.;ion

(d) Ze:::-as of the O{Bn !oop transfer fuLction

57. In a servo-syste:r., 1he ､･ｶｾ｣･＠ used =:Jr

providiLg derivati..-E fe2db-::tck is known as

(a) s-jnchro

lb) Servomotor

ｾ｣Ｉ＠ Potentiome-;rr

(d) '='c.chogenerator

58. The -;ransfer f . .nction of a controllet" is 1+3s .

Gc(s) = -- . 'J'he rrBXImu-:n phase cc.:r1trol 1+s

praviJed by this c ｯｾｌｲｯＭ｟ｾ･ｲ＠ is

(a) 30° lead

(b) :30° lag

Cc: 45° lead

(d) 45° lag

59. Cor_s-,der the ｦｊｮｯＭｷＭｩｮｾ＠ statements :

60.

'The effect of :r:hase lead neu·ork iE givn as

1. ｉｮ｣ｲ･｡ｳｾ､＠ veloo.ty constant.

ｾＭ Increase:i phase maqin.

3. Increaf.ed t an:l\vidtl-.

4. Slower res,?OI:.3e. Vi nich of thE abcve stateiLents a-:-e COrrect ?

(a) 1, 2 anG. 3 onl";r CJ) 1, 2 a:J.d 4 on."y

(c) 2, 3 anJ. 4 on.}y

fd) 1, 2, 3 an.J 4

A binary c}-_annel with capaci-;y ＶｾＮ＠ kbits/s ｾｳ＠available br PC.M V•)ice transw.ission. If signal is. (.and irniteO. to 5 kHz. :;hen the &ppropriru;e v :tlues of quantizing ｾｾｙ･ｬ＠ L and the samp!i'l.g ﾱ･ﾷｾｵ･ｮｱ＠ will be :a) 64 and 7·2 dlz

(b) 32 nd 10--5 kHz

(c) 64 and 10 5 kHz (d) 32 c_nd 7·'2 kHz

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C.·-v_. Vlhich of the following statements are wrrect 64

fc•r Bode plots ? The aerial current of an AM transmitter is

18 .A when un-modulated, but increases to

20 A when modulated. The modulation index 1. Gain margin and phase ｾｮ｡ｲｧｩｮ＠ can be easily determined.

2.

3.

Absolute and relative stability of only minimum-phase systems can be determbed.

Gain margin is positive and system is

stable, if magnitude of Ujco) at phase crossover is positive.

(a) 1, 2 and 3

(b) 1 and 3 only

(c) 1 and 2 only

(d) 2 and 3 o:1ly

62. A communication channel di3turbed by

Gm.: ssian noise has a bandwidth c•f 6 kHz and

S/N ratio of 15. The maximum transmisEion

ｾ｡ｴ･＠ that such a channel can support is

1 a) 2·4 kbits/sec

(b) 24 kbits/sec

ＨｾＩ＠ 32 kbits/sec

(d) 48 kbits/sec

is

(a) 0·68

(b) 0·73

(c) 0·89

(d) 0·98

65. A carrier wavE is phase modulated with

frequency deviation of 20 kHz by a single tone

:TequEncy of ｾ＠ kHz. If the single tone

rrequency is increased to 2 kHz, assu:oing

that phase deviation remains unchanged,

bandwidth of the PM signal is

(:t) ｾＰ＠ kHz

(b) 32kHz

:c> 22kHz

1c) 44kHz

66. A sinusoidal aurlio signal is given by

e.,; = 15 Ein 2n (2000t). It modulates a

63. r"Jr an AM signal, the bandwidth is 20 kHz sinusoidal carrier ·Nave ec = 60 sin 2n (105-t).

and t.:le highest frequency component present

i.s 800 kHz. The carrier frequenc!" used for

tlris AM signal is

(:tt 710kHz

:·.J: '705 kHz

•:c:) ':00 kHz

td) 790kHz

8-GTC..£ -SA3 (11-A)

The value of amplitude modulation ind8x

CLSt be

(a) 0·5

(b) 4

k 0·6

Cd: 0·25

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67. A half duty cycle rectangular clock outp·.1t is 70. Which of the =ollovrir,g staterr_e.J.tE regarding

sam:::·led at 5 times its rate. Spectrum of the

sam:=led clock will be having mirror image in

negstive frequency domain of a

(a) Sampled sine pulse

(b) Periodic sine pulse

(c) Periodic sampled sine pulse

(d) None of the above

68. A ｳｩｾ｡ｬ＠ of maximum frequency of 21\IHz

ｭｯ､｣ｾ｡ｴ･Ｚｬ＠ by 4 GHz carrier is DSB/SC. If the

resul-:a::1t signal is sampled ideally as low pass

;:;ignal, t:he minimum sampling frequency

;;houl:i oe

:a) 41\lliz

)J) 8 MHz

1 c) 4·004 GHz

td) 8·008 GHz

69. lf n1 o..nd n2 are the refractive indices of the

core and cladding respectively, the maximum

c.cceptance angle at the air-core interface

ffiouk be

(a.)

(b)

(c:)

Cc)

' -u-1 In 2 - n 2 -- \ 2 1

I '> 2 Eln-1 n ｾＭ n ',) 1 2

B-GTD-:::>-SA3

71.

72.

bi=urr:r counter are correct ?

1. Clock inputs of all the flip-t1ops of a synchrooous ::o·.1nter are ap9lied fron the same socrce whereas tLose in a:> asynchro :1.0us caunter are from diffErent sources.

2. Asynchranous cx•unter hffi ri}ple efect3 -.vhereas syncl:-.rcnous c:>u.J.1er has not.

3. Only J-K t1ip-rkps car. be usee. in synchronous counter whereas asynchronous ccunter can bE designed with any ｾｹｰ･＠ Jf t1ip-t1ops

(a) :.., 2 and 3

(b) :.. and 3 only

(c) 2 and 3 ody

(d) 1 and 2 or.ly

Ma.lCi=num frequency retlected f::-om

ion•)S]here is 9 1\'IHz on a particular day. The

ma:.{imum ion densiJ;:r/::J.etre3 is

(a) 108

:b) 106

:c) IJ12

ci) 1)9

The ::_nti-aliasi11J5 fil-:er has a hi5he:::- cut-off ｾﾷｲ･ｱｵＸｮ｣ｹ＠ fm. Its output is .;;ampted peri::Jcically ･ｶｾｹ＠ T8 seconds. For proper recovEr/ of the s_gnal at the receiv-er, T8 m·.1st

be

1 (a) ｔｾ＾ＭＭｾＭ (2fm)

(:>:I 1

Ts<--' - (2fm)

( ..... \ ' 2 Ts:::::-,, fm

(d) 2

Ts:<O:-fm

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73. A binary channel with capacity 36 kbit:Js is 76. An optical fibr::l com111unication system works

aYailable for PCM voice transmissioc_. If on a waveleq;th )f 1·l ｾｭＮ＠ The number of

signal is band limited to 3·2 kHz, the:J. the

appropriate values of quantizing level L and

sampling frequency will be

(a) 64 and 7·2 kHz

(bl 32 and 7·2 kHz

(c) 64 and 3·6 kHz

Cd:1 32 and 3·6 kHz

7 4. A tibre-optic cable has the indices of refrrlion

of core of 1·6 and of cladding of 1·4. Fer an

angle of incidence 70°, the angle of return

light ray will be

(a) 35°

(b) 61°

(c) 70°

(d) 90°

75. In an optical communication system, having

an operating wavelength A. in metres, only X%

of its source frequency can be used as its

channel bandwidth. The system is to be used

for transmitting TV signal requiring a

bandwidth off Hz. The number of channels

transmitted by this system ｳｩｭｵｬｴ｡ｮ･ｯｵｳｬｾｹ＠ is

(c =speed of light)

(a)

(b)

(c)

(d)

100Xc A.f

100A.f Xc

Xc A.f

Xc

100A.f

subscribers it ｾ｡ｮ＠ ｦ･ｾ､Ｌ＠ ｾｦ＠ a channel requires

• 20kHz, is

(a) 2·3 x 10:..•

(b) 1 )( 105

(c) 1·15 x 1o:.o

(d) 1010

77. Consider the ｦｃｴｬｬｯｷｾｮｾ＠ state:nents regarding a

common emitter acpLfiET. ｉｾ＠ can be converted

into an oscillat:x b::'

1.

2.

3.

4.

ｐｲｯｶｩ､ｩｮｾ＠ ade:rURtE ?03itive feedback.

Phase shifting the I)U-;put by 180° and feeding bis pb.a..se-s:1ifted output to the input.

Using onl::' a series tmned circuit as a load on tf.e ar:-_plifier.

Using the ｮ･ｾｴｩｶ･＠ resistance device as a load on be amplifier.

Which of the ab:we stat.ements are correct?

(a) 1, 2, 3 anc 4

(b) 1 and 2 or:ly

(c) 2 and 3 only

(d) 3 and 4 only

B-GD-0-S.A.B :13-A)

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78. For an angle modulated signal,

xm = 6 COS (21t X 106 t + 2 sin (8000 rt) + 4 cos (8000 rt)] V.

The average power of x(t) is

(a) 10 W

(b) 18 w

(c) 20 W

(d) 28 w

79. A single tone 4 kHz message signal is

81. In Jrder to irrpove the syEtem re.sponse

trarsient behavic·ur. the -:ype of ﾷｾｯｮＭＺ［ｲｯｬｬ･ｲ＠

used is

(a) Phase lead con-xoller

(b) Phase lag c-ontroller

(c) PI controller

(d) P controller

sampled with 10 kHz and 6 kH:;;. Aliasing 82. The -Juilt-in potential (diffusion potential) in a

effEct will be seen in the recons:ructed signal

wh•m the signal is sampled with

(al 10kHz

(b) 6kHz

( c 1 Both 10 kHz and 6 kHz

(d) Neither 10kHz nor 6kHz

80. A Eource produces 26 symbols with equa,

probabilities. What is the average information

pnduced by the source?

(a: Less than 4 bits/symbol

(b; 6 bits/symbol

(c) 7 bits/symbol

(d) Between 4 bits/symbol and 6 bi-cs/symboi

8-GTD-0-SAB ( 14- A)

p-n j ｾｮ｣ｴｩｯｮ＠

1. is equal :c• -:he ciffuence ir the Fermi-level of the tw•o s _des, ･ＺｊＺｰｲｾｳｳ･､＠in volts.

2. increases ｷｾｴｨ＠ the incnase in the doping levels of the ｴｾ｣＠ sid3s.

3. increases vitn tte ｾｮ｣ｲ･｡ｳ･＠ m

temperature.

4. is equal to the :::vuage of the Fermi-levelE cfthe tvro sides.

Which of the above statener_ts are correct ?

(a) 1 and 2 only

(b) 1 and 3 only

(c) 1, 2 and 3

(d) 2, 3 and 4

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83. Consider the following statements for TEM 86. p_ transmitting anterilla with a 300 MHz (Transverse Electro Magnetic) waves :

1. Only for TEM wave, could the conductor separation be small compared with a wavelength.

2. TEM mode needs to be considered at low :requencies.

3. TEM waves are usually not obeying Maxwell's equations.

4. TEM waves are usually treated like 'ordinary transmission line signals'.

Which of the above statements are correct ?

(a) 1, 2 and 3 oo.ly

(:J) 1 and 2 only

(c) 2, 3 and 4 only

(d) 1, 2, 3 and .;

87.

S4. An analog signal is sampled at 36 kHz and

:ruantized into 256 levels. The time duratic•n 88.

Jf a bit of the binE.ry coded signal is

a) 7·43 )lS

'b) 6·43 ｾｴｳ＠

tc) 3·47 )ls

(c) 1·47 !l8

c:rrcin frequency produces 2 kW of power. If

b::b. t:-ansmitting and receiving antennas

h£.-ve unity power ｧ｡ｾｮＬ＠ the power received by

the ｲｾ･ｩｶｩｮｧ＠ an-;enna at a distance of 1 km is

(EI 1L·8mW

(t: 18·4 mW

(c) 18·4 !lw (ci; 1:!·7 .uW

'A If the :liameter of a - dipole ante:n.r_a is

2

. d f A A th 't 1rxr=asE- rom -- tJ - en 1 s 100 50

(aJ 3a.ndwidth increases

·:b l :Oandwidth decT"?a3es

(c: Gain incre:o.ses

(d 1 Gain decreases

Tte ide.al gain of & parabolic antenna of

diame1e::-10m fo::- a w::tveleng:h of 316 em is

(a: ｾＰ＠ dB

(b: ::o dB

(c:• 40 dB

ｾ､ｬ＠ EO dB

85. "h 0 IJ. _ e ratiO - 1s o:· s

1. Intrinsic ratio

ｾＮ＠ Loss tangent

89. An E.nte.:ma con8.sts Jf 4 identical He:-t::ian

diJ:·oles t:niformly located along the z-axis and

polariz8C. in z-dir8ction. The 8pacing between

thE c ipJJ.es is ?:._ . The group pattern func-;ion 4

is ::. Conduction ratio

4. Dissipation factor (a) n n

4 cos (-cos E) cos (-cos 8) 4 2

ｾｩ｣ｨ＠ of these are correct ?

:a) 1 and 2 (b) 4cos Ｈｾ｣ｯｳｅＩ｣ｯｳ＠ Ｚｾ｣ｯｳＸＩ＠

4 8

:b:l 1 and 4

·: c:) 2 and 3

(e} 4cc•s ( 2 cos 8) sin ｾ＠ ::os e) 4 '2

td:• 2 and4 ( ;r . n 8) 4 CC S -COS 9) Sill • - ::OS 4 8

B-GTD..Q-SAB (15-A)

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ｾﾷＭCurren: r2quired to radiate 100 W of power at 94.

100 MHz from O·t)l m dipole will be

The fre·1uency

commu::licEtion is

range fer ｳ｡ｴｾｅｩｴ･＠

(a) 131 A

Cbl iHA

Cc) 1:.1 A

<d) 161 A

91. The length of half-wave dipole at 30 MHz will

·:a) Ｎｾ＠ rr_

:b; 10 -n

:c) 15m

:d) E·5 m

E2. Microvm·;e irr_pedance measurement 1s

carried out by

(a) Slctted line method, Reactive

｣ｩｩｾｯｮｴｩｮｵｩｴｹ＠ and ｒ･ｦｬ･｣ｴｯｾｴ･ｲ＠

(b) ｭｾｴ･ｲ＠ method, Slotted Line

:nE thod and Down conversion method

(c) Slotted line method, CW measurement .m.:l Swep-:; frequency measurement

(d) ｾ＠ cne of the above

93. A moculated signal is given by

.s(t) = e-a: cos [(we+ Llw) t] u(t).

The complex envelop of s(t) is

(a) e-at ･｛｟ｩＨｷ･ＫｾｷＩｴ｝ｵＨｴＩ＠

(b) e-at eLi !'!cd]u( t)

(c) eli IDltlu( t)

(d) -e[j(oc Ｋｾｷｬｴ｝ｵＨｴＩ＠

where, a, we End !leo are positive constEnts

and u:c >> Llm.

(a) 1 :>:Hz- 100 kEz

(b) 1)0 kHz -1 M3z

(c) D MHz - 30 1\CH::

(d) 1 GEz-30 GEz

95. A para)oli.::: dish ant:mna of 1m diame-:;e:-and

efficien ｾｹ＠ of 70%, o:;>erating at 20 GHz, will

have a :sai:1 of nearly

(a) 2) dB

(b) ｾＮＩ＠ dB

(c) ｾＮＩ､ｂ＠

(d) td) dB

96. The dcirr_al equiYalen-:; of Binary 110·001 is

(a) €·2E

(b) ｴﾷＱｾＵ＠

(c) t 2·E

97. Given ＨＱｾＵｾ＠ = (2(3)5. The value of radix R

will be

(a) ::..6

(b) 10

(c) ;3

(d) -3

B-•3TD-O-SAB ＨＱＶＭＭａｾ＠

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:}8. TD.e 1's ｣ｯｭｾｬ･ｭ･ｮｴ＠ of (25·639\0 is

:a. 74·36(

(b) 0·6732

ＨｲｾＩ＠ 3·732

(c) 17·436

99. Ccr...Eider the following statements:

100.

1. \\-nen two unsigned numbers are aC.ded, ar_ overflow is detected from the carry in::.o the most significant position.

2.

3.

An overfbw does not occur if the two :m:nbers E-dded are both negative.

ｾｦ＠ the carry into the sign bit position ｡ｾ､＠ carry out of the sign bit position are r.ot equal, an overflow condition is poroc ·v.ced.

Wbcil of L1e abo\ e statements is/are correct ?

,:_a. 1, 2 E-nd 3

:.): 1 cnl:"

(c) ｾ＠ (}rtl}

(.f) 3 only

ｔｨｾ＠ stateoer:t label in a subroutine

Ｈ｡ｾ＠ :v.lE-y ｢ｾ＠ the same as in the main pre gram

(b) I a ,;;thra:rs the same as in the main ｰｲｯｾ｡ｭ＠

(c) ::::.mnct De the same as in the mam program

(d) Canr_o1 bE used

101. Techniques that automatically .:nave program

and data blocks into the ｊｩｬｾｩＮｾ｡ｬ＠ main

memory when they are required for Ｐｸ･｣ｵｾｩｯｮ＠

are called

:a) Main memory techniques

(b) Virtual memory techniques

(e) Cache memory techniques

(() Associate mapping techniquEs

102. Minimum sampling frequency rE:q1Iired tc

reconstruct

is

(a) 1 x 103Hz

(b) 2 x 103Hz

(c) 4 x 103Hz

(d) 6 x 103Hz

103. In a m}croprocessor, WAIT states are us:!d tc

(a) ｎｾ｡ｫ･＠ the processor WAIT dur:ng a DMA operation

(b) Make the processor WAIT durin5 ｾｮ＠interrupt processing

(c) Make the processor WAIT during a. power shut down

(d) Intrrface SLOW peripheral to th-:: processor

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104. A repster of microprocessor which keeps

track •)f the execution of a program and wr_ich

contains the memory address of the next

instruction to be executed is called

(a) Index register

(b) :Memory address register

(c) Program counter

(d) Instruction register

105. Which of the following statements are

correct?

1.

2.

3.

4.

DRAM offers reduced power

ｾｯｮｳｵｭｰｴｩｯｮＮ＠

An associative memory is cheaper than RAM.

The fastest and most flexible cache Jrganization uses content address&ble memory.

The address generated by a segmented program is called a physical address.

(a) 1 and 3

(b) 1 and 4

(c) 2 and 3

(d) 2 and 4

106. What is the act.ivity of the micro""Jrocessor

8086/8)88 when the signals SS0 , DT/ E and

IO/M are 1, 0 and 1 respectively in Dinirr_um

mode?

(a) Read memcry

(b) Read I/0 pc•rt

(c) Code Acces3

(d) Write I/0 pJrt

107. OS th::.t permits multiple prog::-ans to b2 run

simultaneously u.sicg a sing8 Ｚｊｲｯﾷｾ･ｳｷｲ＠ is

referred to as

(a) Multi tasking

(b) Multithreading

(c) Multi-user

(d) Multi-procEssing

108. In mode 0, IntErrupt on ter:Ilinal coln-:; of

8253, if the gate pin is madE- lc·w while

counter is decrEIDe:J.ting, which one cf the

following operations will follow ?

(a) Counter stops and cleared to '0' and starts decrementing wh:m ｧ｡ｾ･＠ pin is made high

(b) Counter ;;tops and tooreaftu it increments till gate pin = '1' hif:h

(c) Counter stops, the curre:J.t conten-:;s are held and the deererr:ent )pe:"ation resumes o:1ly after g:::.te pin is rr_ade high

(d) Counter sto)ps, the curre:J.t conten-:;s are held for onE clock cycle anc the decrement ｊｰ･ｾ｡ｴｩｯｮ＠ res-..:mes

B-GTD-0-SAB (18-A)

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109. W:-:b respect to the default :IR7 routine in

826.9 PIC, which of the following state::nents

are correct ?

1.

2.

3.

Default CALL to the IR7 routine -,vhen a_-_ invalid interrupt occurs at IR pin.

A default IR7 CALL doeE not set the corresponding ISR bit.

A -iefault IR7 routine is nothing but the same valid IR7 routine -.vith lowest priJrity.

(a) :., 2 and 3

(b) 1 ard 2 only

(c) :_ am 3 only

(d) !2. and 3 orJy

110. In a micr-Jprocessor system with memory

mapped"JO

(a) ｄ･Ｇ｜ｩ｣ｾＺＺｳ＠ have 8-bit addresses

(b) ｄ･ﾷＮｲｩ｣ｾ＠ are accessed using IN and OUT inst::"uctions

(c) There can be a maximum of 256 input devices and 256 output devices

(d) Ar:itillnEtic and logic operations can be directly oerformed with the I/0 data

111. In a mic::"oprocessor when

interrupted, it a CPU is

(a) Stops execution of instructions

(b) Acknov.:lec'ges interrupt and branches of subrou-:ine

(c) ａ｣ｫｮ｣ｲｮＮｾ･､Ｖ･ｓ＠ interrupt and continues

(d) Acknow-ledges interrupt and waits for the n =xt instruction from the interrupting-device

112. Consider the following statementE :

The advantage of cycle stealing in DlY..:A. is that

1.

2.

3.

It increases the maximum 1'0 transhr rate.

It reduces the interference b? the DMA controller in the CPU's memo:"y accHE.

It is ben8ficially 9mployed for I/0 ､･ｶｩｾ･＠with sho:"ter bunts of data tra_1.sfer.

Wh;ch of the above stat3ments are ccrrect?

(a) 1 and 2 only

(b) l and 3 only

(c) 2 and 3 ｯｮｾｹ＠

(d) L 2 and 3

113. D input of a clocked D-ilip-flop receives an

input A 8 Qn where A is an external logic

input c.nd Qn is the outpJt of the nth D-FF

before fue clock ｡ｰ［ｾ･｡ｲｳＮ＠ The circuit wor_:-.s as

(a) E::: OR gate

(b) T-E'F

(c) D-:?F

(d) JK-FF

114. 'Which one of the following is the conect

answer when 1101:.2 is subtracted fnm

111012 by ;1sing the 1':; comple:J.nent method?

(a) 0100:.

(b) 10001

(c) 00011

(d) 00010

B-GTD-0-SAB (19-A)

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1L5. An ｅｸＮｾ･ＳｳＭＳ＠ code ｾｲｩｴｨｭ･ｴｩ｣＠ operation is used Directions : Each of t.w ｮ･ｾｴ＠ threE: (03) iruns

to perf.:mn the consists of two ｳｴ｡ｴ･ｲｲＮｾｴｲＺＬ＠ n;ne la':Jflled as the 'Statement (JJ' and thE otRer as 'Stfrfement UL '.

(a) Bi::lary addition

(b) 3i::tary subtraction

(c) 3CD addition

(d) 3CD subtraction

116. ConvErt the decimal41·6875 into octal.

(a) 51·54

(b) 51·13

(c) ＵｾﾷＱＳ＠

(d) 5:..·51

117. If the variance ax 2 of d(n) = X(n) - X(n - 1) is

one-tenth the variance ax 2 of a stationary

zero-mean discrete-time signal X(n), then L1e

normalized autocorrelation function

RXY (K:/crx2 at K = 1 is

(a) 0·95

(b) (}90

(c) 1}10

(d) I}· 05

Examine these two stat.E.ne'?.ts careful,y and s??ect the answers to these itens ur.ing the codes given

below:

Codes:

(a) Both Statement :n :.LJ.d StatEment (Ilj are

individually true anc State:nent (II) is tte

correct explanatio :1 of Ststement :n (b) Both Statement ｾｬＩ＠ anc Statement CID are

individually true but Stalement lll) is no! the

correct explanation of Statement ])

(c) Statement (I) is true bat Statement (II) is

false

(d) Statement (I) is hl82 1:J.t ｓｴ｡ｴＮｾｭ･ｮｴ＠ (II) is

true

118. Statement (I) :

A differential arq:.lifer is used at the input

stage of an operatiomJ amplifiEr.

Statement (II) :

Differential amplifier:; h:.v-e very high CMRR.

119. Statement aJ :

Lead compensatim is us::Jd to irr_prove system stability margins..

Statement (ll) :

Lead compensa:inn a:hieves the desired result through the :nerits of i:s phase lead

contribution.

120. Statement (1) :

The bandwidth of A::\-1 signal depends OL the bandwidth of the modul :..ting signal.

Statement (II) :

The amplitude-n)dulatBd signal contains fc,

fc ± fm frequency ｳｩｧｲ｟｡ｬｾ＠

E·-GTD-0-SAB ( 20-A.)

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SPACE FOR ROUGH WORK

8-GTC-')-SAB ( 21- A)

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SPACE FOR ROUGH WORK

8-GT D-0-Sr\E ( 22- A)

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SPACE FOR ROIJGH WORK

8-::; TD-0-S.AB ( 23- .A)

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SPACE FOR ROUGH WORK

B-GTD-0-SAB (24-A)

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