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questions from technical section is as given below -

1. In a communication system, noise is most likely to affect the signal

(a) at the destination

(b) In the channel(c) in the information source

(d) at the transmitter

2. Indicate the false statement. ourier analysis shows that the saw tooth wave consist of

(a) fundamental and subharmonic sine waves(b) a fundamental sine wave and an infinite number of harmonics

(c) fundamental and harmonic sine waves whose am!litude decreases with

the harmonic number(d) sinusoidal voltages, some of which are small enough to ignore in !ractice

". #ne of the following ty!es of noise becomes a great im!ortance at high frequencies. Is the(a) random noise(www.naukribu$$.com)

(b) shot noise(c) im!ulse noise

(d) transit-time noise

%.Indicate the false statement. &he square of the thermal noise voltage generated by a resistor is

!ro!ortional to(a) its tem!erature

(b) Its resistance

(c) 'olt$manns onstant

(d) the bandwidth over which it is measured

*.If the !late su!!ly voltage for a !late modulated class am!lifier is +, the maimum !late-

cathode voltage could be almost as high as

(a)%v(b)"v

(c)2v

(d)1v

. hich one will be stable if characteristics equation is(a) /02'0

(b) /02-'0-(c) /0%'0203(d) -/02'0-

4.hen microwave follows curvature of the earth, this I know as

(a) fading

(b) 3ucting

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(c) tro!os!here scatter

(d) ionos!here reflection

5. 'roadband long distance communications are originally made !ossible bythe advent of

(a) telegra!h cables(b) re!eater am!lifiers

(c) 6 radio(d) 7eostationary satellites

8. 0witching systems

(a) Im!rove the efficiency of data transfer

(b) are not used in data system(c) require additional lines

(d) are limited to small data networks

19. 'asic grou! '(www.naukribu$$.com)(a) occu!ies the frequency range from 9 to 195 k h$

(b) consist of erect channels only

(c) is formed at the grou! translating equi!ment

(d) consist of five su!er grou!

11. In differential am!lifiers, the common emitter current is made constant

(a) &o make /d (differential gain) very small

(b) &o make /c (common mode gain) very small

(c) &o make the am!lifier symmetrical(d) &o kee! :;; constant

12. 7iven '3 number 1991 9911, its decimal equivalent is

(a) 1%4(b) 1%"

(c) 8"

(d) "8

1". /n am!lifier has voltage gain of *9. this gain in db will be(a) 14 db

(b) "1 db

(c) "% db

(d) 5 db

1%. In a < !lane &ee, the out!ut of the two rams are

(a) 159 degree out of !hase

(b) In the same !hase(c) 89 degree out of !hase

(d) none of these

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1*. waveguide are generally made of

(a) /luminium

(b) 'ron$e(c) 'oth (a) and (b)

(d) none of these

/nswers

1.(b) 2.(a) ".(d) %.(a) *.(a) .(a) 4.(b) 5.(b) 8.(a) 19.(a) 11.(b) 12.(c) 1".(c) 1%.(a) 1*.(c)