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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 19
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?
1, 2 and 3
1 and 2
1 and 3
2 and 3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
Satellites used for international communication are called
cossort
domsat
marisat
intelsat
Answer: Option
Explanation:
No answer description is available. Let's 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?
1 only
1 and 2
1, 2 and 3
2 and 3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
Electronic tubes used for transmitter differ from their counterparts in the receivers in respect that
they are large in size
they are capable of handling large powers
they generate large amount of heat when in operation
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
A plot of modulation index vs carrier amplitude yields a
horizontal line
vertical line
parabola
hyperbola
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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