Electronics and Communication Engineering - Communication Systems

1. 

Which of the following microphones has bidirectional feature?

A. Moving coil
B. Ribbon
C. Condenser
D. Carbon

Answer: Option B

Explanation:

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2. 

In TV transmitter some possible advantages of IF modulation are

  1. The modulator section and visual exciter can be solid state devices
  2. VSB filter can be introduced at low power level
  3. The subsequent stages following VSB filter can be tuned permanently for wideband linear operation
  4. It is economical
which of the above are true?

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

Answer: Option D

Explanation:

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3. 

A source is radiating power equally in all directions. If source power is P, the power density at distance d is

A.
B.
C.
D.

Answer: Option A

Explanation:

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4. 

As compared to AM, FM requires

A. narrow channel
B. same channel
C. 2 to 3 times as large channel
D. 7 to 15 times as large channel

Answer: Option D

Explanation:

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5. 

Capture effect occurs in

A. AM
B. FM
C. PCM
D. QAM

Answer: Option B

Explanation:

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