BSNL TTA Ambala Answer key

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[shikha]

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BSNL TTA exam Answer key

BSNL TTA Sample paper






1) Wave guides are generally made of

(a) Cast iron or steel

(b) White metal or gun metal

(c) bronze or aluminium

(d) plastic or bakelite

2) The cut off frequency of a wave guide means

(a) lower frequencies will not be propagated

(b) it determines the dimensions of the wave guide

(c) frequency at which zero transmission takes place

(d) None of above

3) In case of matched load

(a) Transmission is zero

(b) reflection is zero

(c) reflection is unity

(d) transmission is equivalent to reflection

4) In an AM wave with 100% modulation, the carrier is suppressed. The percentage of power saving will be

(a) 100%

(b) 50%

(c) 25%

(d) 66.7%

5) The function of AM detector circuit is

(a) to rectify the input signal

(b) to discard the carrier

(c) to provide the audio signal
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(d) All of the above

6) In FM, the noise can be further decreased by

(a) decreasing deviation

(b) increasuig deviation

(c) keeping deviation constant

(d) none of these

7) In PPM, message resides in

(a) Pulses

(b) time location of pulse edges

(c) none of these

8) Which of the following pulse systems is preferred for communication in presence of noise?

(a) PAM

(b) PDM

(c) PPM

(d) none of above

9) Which of the following pulse systems requires higher bandwidth

(a) PAM

(b)PDM

(c)PPM

(d)none of these

10) The audio frequency range lies between

(a) 20 to 20,000 Hz

(b) 20 to 20,000 KHz

(c) 400 to 8,000Hz

(d) 500 to 5,000 Hz

11) Maximum undistorted power output of a transmitter is obtained when its modulation is:

(a) more than 100%

(b) 100%

(c) less than 100%

(d) 50%

12) The AGC voltage in a radio receiver is proportional to

(a) the amount of modulation

(b) the amplitude of audio signal

(c) the amplitude of IF carrier

(d) none of these