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

Answer: Option C

Explanation:

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17. 

1 GHz is equal to

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

Answer: Option B

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

Answer: Option B

Explanation:

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19. 

Probability density function of thermal noise is

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

Answer: Option A

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

Answer: Option A

Explanation:

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