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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 14
16.
An FM transmitter has maximum frequency deviation of 75 kHz and reproduces audio signals up to 15 kHz. Minimum channel width required is __________ kHz.
180
120
90
60
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
A 360 W carrier is simultaneously modulated by two audio wave with modulation percentage of 55 and 65 respectively. Total sideband power radiated will be
500 W
360 W
180 W
130 W
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
In a radio detector
stabilization against signal strength variation is provided
linearity is worse than in a phase discriminator
the circuit is the same as in discriminator except that diodes are reversed
output is twice that obtainable from a similar phase discriminator
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
ISDN stands for
Integrated Services Digital Network
Inter Services Digital Network
Inter Subscriber Digital Network
integrated Subscriber Digital Network
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
Under identical conditions, for a single modulating frequency, FM and PM are indistinguishable. Now if the modulating frequency is reduced, then
phase modulation index as well as frequency modulation index decrease
phase modulation index as well as frequency modulation index increase
phase modulation index will remain constant whereas frequency modulation index will increase
phase modulation index will decrease whereas frequency modulation index will remain constant
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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