# Electronics and Communication Engineering - Communication Systems

16.

In amplitude modulation the rms value of radio frequency voltage after 40% modulation is 60 mV. If modulation is 80% the rms value after modulation will be about

 A. 50 mV B. 60 mV C. 66 mV D. 80 mV

Explanation:

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17.

1 GHz is equal to

 A. 106 Hz B. 108 Hz C. 109 Hz D. 1010 Hz

Explanation:

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18.

Consider the following statements

1. In a pulsed radar, the transmitted pulses are of high frequency
2. In a pulsed radar, the transmitted pulses are of high power
3. In a pulsed radar, the transmitted pulses are of brief duration
4. In a pulsed radar, the transmitted pulses are of square wave shape.
Of the above statements the correct statements are

 A. 1 only B. 1, 2 and 3 only C. 1, 2, 3, 4 D. 1 and 3 only

Explanation:

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19.

Probability density function of thermal noise is

 A. Poisson B. Binomial C. Gaussian D. None of the above

Explanation:

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20.

In a colour TV receiver AFT stands for

 A. Automatic Fine Tuning B. Automatic Frequency Tuning C. Automatic Field Tuning D. Alignment Frequency Tuning