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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 23
21.
An angle modulated signal is expressed by fa(t) = cos (2 x 108 pt) + 75 sin (2 x 103 pt). The peak frequency deviation of the carrier is
1 kHz
7.5 kHz
75 kHz
100 MHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
The amplitude of a modulated RF aerial current is 6 A on the peaks of modulation and 4 A on the troughs of modulation. The value of carrier amplitude is
5
15
20
30
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
In practical commercial AM system channel bandwidth is
150 kHz
100 kHz
15 kHz
200 kHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
The currents fed to the two dipoles of turnstile antenna are
in phase
in quadrature
in phase opposition
either (a) or (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
The circuit of figure give an output which is
a frequency modulated signal
an amplitude modulated signal
a phase modulated signal
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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