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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 18
31.
Which is most important subsystem for recovering and reconstructing signal in a TDM system?
Envelope detector followed by a low pass filter
Synchronization ckt for proper timing
Bandpass filter to segregate channels
Coherent detector to ensure frequency and phase connection
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
Which one of the following is an indirect way of generating FM?
Armstrong modulator
Varactor diode modulator
Reactance FET modulator
Reactance bipolar transistor modulator
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
Companding is used in PCM to
reduce bandwidth
increasing S/N ratio
get almost uniform S/N ratio
increase bandwidth
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.

Assertion (A): In AM the amplitude of carrier is made proportional to the instantaneous amplitude of modulating wave

Reason (R): In AM, frequency of side band = frequency carrier ± frequency of modulating wave.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Pressing a key on telephone set generates two frequencies. The basis for selection of these frequencies is
the harmonics of one frequency should not be mistaken for the other frequency
the audio input to the handset transmitter should not be mistaken for a key pressing
both (a) and (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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