Exercise: Communication Systems

Questions for: Communication Systems

In FM, as the modulating frequency decreases and the modulating voltage amplitude
A:
increases, the modulation index increases
B:
decrease, the modulation index increases
C:
remains constant, the modulation index increases
D:
remains constant, the modulation index decreases
Answer: C
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If e = 10 cos (2p x 108t + 20 cos 2p 103t). The bandwidth is
A:
108 Hz
B:
42 kHz
C:
21 kHz
D:
108 ± 103 Hz
Answer: B
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The function of duplexer in a RADAR is
A:
to permit the use of same antenna for transmission and reception
B:
to provide gain to the transmitted power
C:
to amplify the received signal
D:
both (b) and (c)
Answer: A
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Which of the following stage is not present in AM receiver as compared to FM receiver?
A:
AM amplifier
B:
Demodulator
C:
Amplitude limiter
D:
AF amplitude
Answer: C
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LCD uses
A:
nematic crystals
B:
sematic crystals
C:
cholesteric crystals
D:
twisted nematic crystal
Answer: D
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