Electronics and Communication Engineering - Communication Systems

1. 

Consider the following types of distortions in diode detectors

  1. Distortion is caused due to the reason that dc and ac load impedances are unequal
  2. Distortion is caused because ac load impedance has a reactive component at high audio frequencies
  3. Audio frequency diode current is less than dc current
Which of the above are true?

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

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

2. 

Satellites used for international communication are called

A. cossort
B. domsat
C. marisat
D. intelsat

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

3. 

In a phase discriminator fc, is the IF to which primary circuit is tuned. Consider the following statements: The primary and secondary voltages are

  1. exactly 90° out of phase when input frequency is fc
  2. more than 90° out of phase when input frequency is higher than fc
  3. less than 90° out of phase when input frequency is lower than fc
Which of the above statements is correct?

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

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

4. 

Electronic tubes used for transmitter differ from their counterparts in the receivers in respect that

A. they are large in size
B. they are capable of handling large powers
C. they generate large amount of heat when in operation
D. none of the above

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

5. 

A plot of modulation index vs carrier amplitude yields a

A. horizontal line
B. vertical line
C. parabola
D. hyperbola

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

1 2 3 4 5 6 7 8 9 10 Next »