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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 14
11.
In an AM system, doubling of modulation index doubles the antenna current. The system is
single side band full carrier
vestigial side band
single side band suppressed carrier
double side band full carrier
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
A frequency multiplier stage should operate as
class A
class AB
class C
either of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
UHF range is
30 MHz to 300 MHz
300 MHz to 3000 MHz
3000 MHz to 30, 000 MHz
above 30, 000 MHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
A carrier signal at frequency 100 MHz is frequency modulated with modulation index 2 by a signal at 2 kHz. At what frequencies are the sidebands produced?
102 MHz and 98 Mhz
100 MHz + 2 kHz, 100 MHz - 2 kHz
100 MHz ± Δfd where fd is frequency deviation
100 MHz ± 3n kHz, where n is 1, 2, ... S integer
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Which is not purpose of modulation?
Effective radiation
Multiplexing
Narrow band
Increase in signal power
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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