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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 10
46.
Which of the following microphones has highest output impedance?
Carbon
Ribbon
Crystal
Condenser
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
Consider the following statements about PCM
  1. PCM is not noise resistant
  2. PCM requires complex encoding and quantizing circuitry
  3. PCM requires large bandwidth
Which of the above are correct?
1 only
1, 2, 3
2, 3
1 and 3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
In a television transmitter, the output stage is most likely to be
screen modulated class C amplifier
plate modulated class C amplifier
grid modulated class A amplifier
grid modulated class C amplifier
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
The number of bits of information required to indicate the correct selection of 3 independent consecutive events out of 75 equally probable events is
6.23
18.69
10.46
24.92
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
The efficiency of a direct radiating cone type loudspeaker is about
5%
20%
50%
80%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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