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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 18
11.
Some features of RF stage in good radio receivers is
  1. It increases sensitivity by providing amplification to RF signal
  2. It eliminates image frequency interference
  3. It increases selectivity
  4. It reduces noise level
Which of the above are true?
1, 2 and 3 only
1, 2 and 4 only
2, 3, 4 only
1, 2, 3, 4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
During amplitude modulation, the phase angle of the modulating voltage changes by
0°
45°
90°
180°
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
The image frequency of a superheterodyne receiver is
created within the receiver itself
not rejected by IF tuned circuits
independent of the frequency of tuning
due to insufficient adjacent channel rejection
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Image frequency rejection mainly depends upon
detector
mixer
IF
RF
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Which of the following is most likely to be found in an SSB transmitter?
Class A, RF output amplifier
Class B, RF amplifier
Tuned modulator
Class C, audio amplifier
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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