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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 6
36.
Full duplex operation
requires modems at both ends of circuit
requires two pairs of cables
can transfer data in both directions simultaneously
all of the above
Answer: Option
Explanation:

Full duplex system has all these features.

37.
In a tape recorder the erase head is
engaged during playback but disengaged during recording
engaged both during recording and playback
disengaged both during recording and playback
engaged during recording but disengaged during playback
Answer: Option
Explanation:

It is engaged during recording to erase the previous matter.

38.
Consider the following statements as regards advantages of CCD sensors as camera pick up tube
  1. High sensitivity
  2. Good spectral response
  3. Image lag absent
Out of the above which are correct
1, 2, 3
1, and 2 only
1 and 3 only
2 and 3 only
Answer: Option
Explanation:

CCD (charged coupled device) sensors have all these advantages.

39.
Some desirable features of a computer communication network are
  1. It should accept an intended transmission without excessive delay
  2. The data arriving at a receiving point should be processed rapidly
  3. When a transmission calls for a response, the delay of response should be minimum.
Which of the above are true?
1 and 2 only
1 and 3 only
1, 2, 3
2 and 3 only
Answer: Option
Explanation:

All the three features are necessary.

40.
Television transmission is by
ground waves
sky waves
space waves
all of the above
Answer: Option
Explanation:

The reception of signals by space waves is governed by line of sight range limited to about 75 kms or so. For frequencies above 30 MHz (generally used for television) communication is through space waves.

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