mock gate iii(eee 2012)

7/30/2019 Mock Gate III(Eee 2012)

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Institute Of Engineering Studies Mock Test-III (EEE)

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ELECTRICAL & ELECTRONICS

Max marks = 100

Duration = 180 mins

1-Mark Questions(Q.Nos 1-25)

1. In the circuit shown, the network N is a symmetrical resistive network. Use the data given in fig (a). find the

current I in fig (b)

a. 8/3 A b. 8/3 Ac. 4/3 A d. 4/3 A

2 A

4 A

N20 V

Fig.a

I

10N40 V

Fig.b

2. For the circuit is fig. the Inverse transmission parameters are

A

B

Z

Z

a. b.

c. d.

3. Identify which of the following expressions are not Maxwells equation for time varying fields

a. b. c. d.

4.The impulse response of the LTI system described by y(t) = is

a. u(t)= u(t+T)

b. u(t) u(t-T)

c. u(t+T) u(t)

d. u(t-T) u (t)

5. A certain linear time invariant system has the state and the output equations given below


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Y = [ 1 1]

If x1(0) = 1, x2 (0) = -1 u(0) = 0, then dy/dt at t = 0 isa. 1 b. -1

c. 2 d. 0

6. The bode plot shown in the green figure has G(s) as

a. b.

c. d.

7. Assume BJT is biased in active region . What is the gain from Vi to V0 ; assume hie= 1k , hfe = 10

DD

V

V

Vo

i

o

o

2 K

2 K

10 K

VBB

a.0.18 b. -20 c. 20 d. -0.18

8.Which of the following function is having only one minimal form

a. f(A,B,C,D) = m(1,4,5,11,13,15) b. f(A,B,C,D) = m (1,3,7,9,13,15)c. f(A,B,C,D) = m (1,5,10,13,14,15) d. None of the above

9. The stack pointer of an 8085 A microprocessor contains ABCD H

PUSH PSW

XTHL

PUSH D


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JMP EC 75H

At the end of the execution of the above instructions , what would be the content of the stack pointer ?

a. ABCB H b . ABCA H c. ABC9 H d. ABC8 H10. A surge of 100kV travels along an overhead line towards its junction with a cable. The surge impedance for the

overhead line and cable are 400 ohms and 50 ohms respectively. The magnitude of the surge transmitted through

the cable is

a. 11.11 kV b. 22.22 kBc. 12.50 kV d. 88.89 kV

11. Consider the following statements with reference to protective relays:

1. The minimum relay coil current at which the relay operates is called pick-up value

2. The pick-up value of a relay is 7.5A and fault current is 30A. Therefore, its plug setting multiplier is 5.

3. An earth fault current is generally lesser than the short-circuit current.

4. Induction relays are used with both a.c. and d.c. quantities.

Which of these statements are correct?

a. 1 and 2 b. 2 and 3

c. 1 and 3 d. 1, 2 and 4

12. Taking the density of water to be 1000 kg/m3, how much power would be developed by a hydroelectric

generator unit, assuming 100% efficiency, with 1.0 m head and 1.0 m3/s discharge?

a. 2.90 kW b. 4.45 kW

c. 9.80 kW d. 19.60 kW

13. A 3-phase cycloconverter is used to obtain a variable frequency single-phase a.c. output. the single phase a.c.

load is 220V, 60A at a power factor of 0.6 lagging. The rms value of input voltage per phase required is

a. 376.2V b. 311.12 V

c. 266 V d. 220 V

14. Match List-I (Converters) with List-II (Type of conversion) and select the correct answer:

List-I List-II

A. Controlled Rectifier 1. Fixed DC to variable voltage and variable frequency AC

B.Chopper 2. Fixed DC to variable DC

C. Inverter 3. Fixed AC to variable DC

D. Cyclo converter 4. Fixed AC to variable frequency AC

Codes:

A B C D

a. 2 3 1 4

b. 3 2 4 1

c. 2 3 4 1

d. 3 2 1 4

15. Consider the following statements:

1. Both voltage source inverter and current source inverter require feedback diodes.

2. Only current source inverter requires feedback diodes.

3. GTOs cannot be used in a current source inverter.

4. Only voltage source inverter requires feedback diodes.

Which of the statements given above is/are correct?

a. 1 only b. 2 and 3

c. 3 and 4 d. 4 only

16. What should be the main characteristic (s) of the null detector in a bridge measurement ?

1.Accuracy 2.Precision 3.Sensitivity 4. Resolution

Select the correct answer using the code given below


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a. Only 1 and 2 b. only 2 and 3 c. only 3 and 4 d. only 317. A shunt generator has a critical field resistance of 200 at a speed of 800 r.p.m. If the speed of the generator is increase

1000 r.p.m. what is the change in the critical field resistance of the generator?

a. Decrease to 160

b. Remains the same at 200

c. Increase to 250

d. Increases to 312.5 18. Match List-I (Machine characteristic) with List-II (Quantity) and select the correct answer using the code given below the

List-I List-II

a. Open-circuit characteristic 1. p.f. vs. If

b. V curve 2. Ea vs. Ia

c. Internal characteristic 3. Eg vs. If

d. Inverted V-curve 4. Ia vs. If

Codes:

A B C D

a. 3 1 2 4

b. 2 4 3 1

c. 3 4 2 1

d. 2 1 3 4

19. Which one of the following is the correct statement?

The output line in an induction motor circle diagram is the line joining the tip of the

a. no load current phasor to the point corresponding to slip = 0

b. no load current phasor to the point corresponding to slip = 1

c. short circuit current phasor to the point corresponding to slip = 1

d. short circuit current phasor to the point corresponding to slip = 0

20. The stator of 3-phase, 6-pole a.c. machine has 45 slots. The stator winding has 45 coils with a coil span of 6 slots. W

of winding will be selected for this machine?

a. Double-layer, fractional slot, short-pitched winding

b. Single-layer fractional slot, short-pitched windingc. Single-layer integral slot, full-pitch winding

d. Double-layer, fractional slot, full-pitch winding

21.The symmetric part of

84

21A is

(a)

82

41(b)

42

11(c)

83

31(d)

13

38

22. The value of the Integral a

dxxa0

22is

(a)4

a

(b)2

a

(c)4

2a

(d)2

2a

23. ,).( sdP where P is a vector is equal to


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(a) ldP. (b) ldP. (c) ldP. (d) dvP. 24. A bowl contains one red and two blue marbles. You close your eyes, choose two

marbles one at a time from the bowl and record their colors. What is the probability

that both marbles are red?

(a) 1/3 (b) 1/6 (c) 2/3 (d) 1/2

25. Find )50('y of the tabulated function 10logy x given belowx: 50 55 60 65

y: 1.6990 1.7404 1.7782 1.8129

(a) 0.0435 (b) 0.087 (c) 0.0087 (d) 1.7

Two Mark Questions (Q.Nos 26-55)

26. For the circuit shown in fig, the switch is closed for a long time and it is opened at t = 0. The current through

the 50 resistors is

a. 3 e-t/160

b. 3 e

-t/100

c. 3e-100t

d. 3e-160 t

10

S

20 50

0.5 H

150 V

t = 0

-+

27.If the electric field intensity is given by

E = ( x ux + y uy +z uz) volt/m,

The potential difference between X(2, 0, 0) and Y (1, 2, 3) isa) + 1 Volt b) 1 volt c) + 5 Volt d) + 6 volt

28. The expression is equal to

a. 200

b. t20

c.

d. 210

29. The signal x(t)=(2+2j) e-j3t -3je-j2t +5+3jej2t + (2-2j)ej3t isa. Real and periodic

b. Real and aperiodic

c. Imaginary and periodic

d. Complex and a periodic

30.A position control system for a robotic arm on-board the Space Shuttle can be modeled as


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cR(s)

+

-G (s) Y(s)

H(s)

G (s)

Where

and

H(s) = 1

A phase-lag compensator that provides an approximate phase margin of PM = 300

is

a.

b.

c.

d. None of the above

31. The unit impulse response of a unity feedback control system is given by c(t) = -te-t

+ 2e-t( t 0)

The open loop transfer function is equal to

a. b.

c. d.

32. The pole zero map and the Nyquist plot of the loop transfer function GH(s) of a feedback system are shown

below. For this

x x

j

O

O

s-plane

x

a. Both open loop and closed systems are stableb. Open loop system is stable but closed loop system is unstablec. Open loop system is unstable but closed loop system is stabled. Both open loop and closed loop are unstable


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33. As shown in the figure M1 and M2 are of same size M3 is triple in width as compared to M2 or M1. assume

process parameter (Kn) is equal for all the devices. What is the value of V0 (Gate voltage of M2 is 1 V)

3 V

2 K

W/L

3 V

500

Vo

1 V

M M3

3W/L

1

2

MW/L

a. 2 V b. 2.25 V c. 1 V d. can not be determined as gate voltage of M1 is not given

34. Assume op-amp to be ideal. Switches are controlled be signals 1and 2. Then the output waveform is

1

3 Vf

Vo

3 f

1 2


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a.

b.0

1 V

c.

d.35.The square wave C1 shown in figure is given to the clock input of a 4-bit binary UP/DOWN counter whose

UP/ input is fed with the pulse train Pu . The counter is a negative edge triggered one. The counter starts

with 0000 and will reach 0000 again at the

P

41 2 3 5 6 78

C1

4

a.15 th clock pulse b. 16 th clock pulse c. 4 th clock pulse d. 48 th clock pulse

36. The Boolean function f(A,B,C,D) realized by the multiplexer as shown in the figure


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S

4 X 1

I

I

I

C

1

D

o

o

2

3

00

I

S

1

0

A_

12

3MUX

21

o

f(A,B,C,D)

o

E

B

a.f(A,B,C,D) = m (0,2,7,9,11,12,15) b. f(A,B,C,D) = m(1,3,4,7,8,9,15)

c. f(A,B,C,D) = m( 1,2,7,9,10,11,15) d. f(A,B,C,D) = m(2,3,7,9,12,14,15)

37. The ABCD constant of a 3-phase transmission line are

A= D = 0.8 10

B = 170 850

C = 0.002 90.40

mhoThe sending end voltage is 400 KV. The receiving end voltage under no-load condition is

a. 400 kV b. 500 kV

c. 320 kV d. 417 kV

38. Two generating stations connected to a load centre having capacity of 50 MVA and 75 MVA deliver 100 MW to

the load. The incremental cost of plant 1 is 15+ 0.15 P1 and that of the plants 2 is 18 + 0.15 P2. What are the values

of P1 and P2 respectively?

a. 60 MW and 40 MW

b. 50 MW each

c. 72 MW and 28 MW

d. 30 MW and 70 MW

39. A half-controlled bridge converter is operating from an r.m.s. input voltage of 120 V. Neglecting the voltage

drops, what are the mean load voltage at a firing delay angle of 00

and 1800, respectively?

a.

b.

c.

d.

40. An ideal chopper is operating at a frequency of 500 Hz from a 60V battery input. It is supplying a load having

3 resistance and 9 mH inductance. Assuming the load is shunted by a perfect commutating diode and assuming

battery is loss less, what is the mean load current at an on/off ratio of 1/1?

a. 10A b. 15 A

c. 20 A d. None of the above


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41. A single-phase full-bridge inverter is connected to a load of 2.4 . The d.c. input voltage is 48 V. What is the

r.m.s. output at fundamental frequency?

a. b.

c. d.

42. A moving-coil instrument gives full-scale deflection for 1 mA and has a resistance of 5 . If a resistance of

0.55 is connected in parallel to the instrument , what is the maximum value of current it can measure ?

a.5 mA b.10 mA c. 50 mA d. 100 mA

43. Which of the following function satisfy the conditions of Rolles theorem?

(a) Sin

11;

1

x

x(b) x

x

xTan0;

(c) 10);1( xxx (d) 10;1

xx

x

44. ,P where P is a vector, is equal to

(a) PPP .2

(b) PP .2

(c) )(.2

PP (d) ).().(2

PP 45. Chennai suburban railway has 21 stations designating a ticket from one station to another station as distinct

type of ticket , number of types of tickets required for the railway service is?

(a) 441 (b) 421 (c)420 (d) 210

46. A computer science class consists of 13 females and 12 males.6 class members are to be chosen at random to

plan picnic.what is the probability that exactly 4 females & 2 males chosen?

(a) 0.1 (b) 0.3 (c)0.4 (d) 0.2

47. The cubic polynomial which takes the following values is

2

100

0

y

x 1

1

3

1

(a) 12 23 xxx (b) 13 23 xxx (c) 12 23 xx (d) 122 23 xxx Common Data Questions(48,49)

48.Two , 3-phase generators are connected to bus . The ratings are

G1 : 1 MVA G2 : 1.5 MVA

6.6 kV 6.6 kV

10% 20%

If a 3-phase fault occurs on the bus, the short circuit kVA will be

a.17500 b.18500 c.19500 d.20000

49.If the short circuit kVA is required to be limited to a value of 10,000 , the reactance of the reactor to be

connected to the Generator 1 will be

a.40 % b. 50 % c. 60% d. 90 %

Common data Questions (50,51)

Three identical single phase transformers are connected as delta-delta. Each of the transformer is rated at 100

KVA, 5000/250V and has an equivalent impedance referred to HV side is (1+j6) . The primary side of this

transformer A is led from a second transformer B through a three phase feeder of leakage impedance (0.4 + j1)

/phase. The transformer B is connected as star-delta and is rated at 500 KVA, 50/5 KV. The equivalent


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impedance of the transformer B is (2+j12) /phase referred to delta connected 5 KV side. The voltage applied to

the primary terminals of transformer B is 50 KV. A three phase short circuit occurs at 250V terminals of

transformer A

50. Per unit impedance of transformer B on a base of 200 KVA is

a. 0.00267 + j0.016 P.U b. 0.00923 + j0.0554 P.U

c. 0.00533 + j0.032 P.U d. 0.016 + j 0.096 P.U

51. Fault current 5 KV feeder is

a. 17.51 P.U b. 12.37 P.U

c. 19.34 P.U d. 8.37 P.U

Statement for linked answer Questions 52 and 53

A synchronous motor is connected to an infinite bus at 1.0 pu voltage and draws 0.6 pu current at unity power

factor . Its synchronous reactance is 1.0 pu and resistance is negligible

52.The excitation voltage (E) and load angle () will respectively be

a.0.8 pu and 36.860

lag b. 0.8 pu and 36.860

lead c. 1.17 pu and 30.96 pu lead d. 1.17 pu and

30.960

lag

53.Keeping the excitation voltage same , the load on the motor is increased such that the motor current increased

by 20 %. The operating power factor will become

a.0.995 lagging b. 0.995 leading c. 0.791 lagging d. 0.848 leading

Linked Questions (54,55)

54.Consider the network shown in fig.

1

b

3

a2

1 3 A- x

V

+

Vx

The Thevenins equivalent across the terminals a, b is

a. 3V, 3 b. 1V, 3

c. 3v, 1 d. 1v, 1

55. If a variable load resistor RL is connected to the terminals a, b then the maximum power delivered to R L isa. 2.5 W b. 2.25 W

c. 2.75 W d. 3.25 W

GENERAL APTITUDE

1-Mark Questions (Q.Nos 56-60)

56.Fill in the blanks

Neither the salesman nor the marketing manager of the system

a.is favouring b. is in favour c. are in favour d. are for favour

57. Select from amongst the four alternatives the word which is most nearly opposite in meaning to the word

given in capital letters

IMPLICIT

a.satire b. baseless c. unexplained d. definite

58.How many words , with or without meaning , can be formed using all letters of the word EQUATION , using

each letter exactly once ?

a. 38320 b. 39320 c.40320 d. 38400

59.If the ratio of the areas of two squares is 9:1, the ratio of their perimeters is

a.9:1 b. 3:4 c. 3:1 d. 1:3


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60.A ball rolling up an incline covers 36 meters during the first second , 32 meters during the second, 28 meters

during the next and so on. How much distance will it travel during the 8th

second

a. 8 meters b. 6 meters c. 7 meters d. 9 meters

2-Mark Questions (Q.Nos 61-65)

61.In this question, some part of the sentence is underlined , select the best alternative

The most important food energy source of threefourths of the worlds population are grains

a.For three-fourths of the worlds population are grains b. For three-fourths of worlds population is grains

c.For three-fourths of the worlds population is grains

d. For three-fourths of the worlds population is grain.

62.Fill in the blanks

Measurement is, like any other human endeavor, a complex activity , subject to error , not always used

, and frequently misinterpreted and

a.mistakenly. derided b. erratically. Analyzed c. systematicallyorganized

d. properly..misunderstood

63.In this question, a related pair of words or phrases is followed by four choices. Select the choice that best

expresses a relationship similar to that expressed in the original pair

CARPENTER : SAW ::

a.stenographer : type writer b. Painter : brush

c. lawyer : brief d. seamstress : scissors

64.Many people are murdered by killers whose homicidal tendencies are triggered by an official execution. Since

1977, for each execution there have been about four homicides if each of the 1788 death-row prisoners were to be

executed , up to 7,152 additional murders will result

Which of the following , if true , would weaken the above argument ?

a.The rate of murders to executions is 4:1

b. There is no relation between executions and murders

c. Executions result from the higher incidence of violent crime

d.The death penalty will be abolished

65. If a card is picked up at random from a pack of 52 cards. Find the probability that it is a king or queen

a. 3/13 b. 2/13 c.7/52 d. 1/169


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Mock Test-III(EEE) key

1.d 2.c 3.a 4.b 5.a 6.c 7.c 8.c 9.c 10.b 11.c 12.c 13.c

14.d 15.c 16.d 17.c 18.c 19.b 20.a 21.c 22.c 23.a 24.a 25.c

26.d 27.c 28.d 29.a 30.a 31.b 32.b 33.a 34.d 35.d 36.b 37.b

38.b 39.a 40.a 41.a 42.b 43.c 44.d 45.d 46.c 47.a 48.a 49.d50.c 51.a 52.c 53.d 54.c 55.b 56.b 57.d 58.c 59.c 60.a 61.d

62.d 63.d 64.b 65.b

mock gate iii(eee 2012)

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