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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 9
21.
LCD uses
nematic crystals
sematic crystals
cholesteric crystals
twisted nematic crystal
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Which of the following stage is not present in AM receiver as compared to FM receiver?
AM amplifier
Demodulator
Amplitude limiter
AF amplitude
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
The function of duplexer in a RADAR is
to permit the use of same antenna for transmission and reception
to provide gain to the transmitted power
to amplify the received signal
both (b) and (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
If e = 10 cos (2p x 108t + 20 cos 2p 103t). The bandwidth is
108 Hz
42 kHz
21 kHz
108 ± 103 Hz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
In FM, as the modulating frequency decreases and the modulating voltage amplitude
increases, the modulation index increases
decrease, the modulation index increases
remains constant, the modulation index increases
remains constant, the modulation index decreases
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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