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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 20
41.
Which of the following can be used to convert PPM into PWM?
Integrator
Astable multivibrator
Bistable multivibrator
Monostable multivibrator
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
For an antenna of height ht metres, the radio horizon is equal to
4ht metres
4ht km
2.5ht km
2.5ht metres
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
If in a radio receiver, RF signal has a frequency of 800 kHz and local oscillator that of 1000 kHz, then at the output of the mixer, the frequencies found would be __________ kHz.
800 to 1000
200, 800, 1000, 1800
only 200
only 1800
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
In the stabilized reactance modulator AFC system
phase modulation is converted into amplitude modulation by the equalizer circuit
the discriminator frequency must not be too low or the system will fail
the discriminator must have a fast time constant to prevent demodulation
the higher discriminator frequency, better the oscillator frequency stability
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
In AM, the modulation envelope has a peak value double the unmodulated carrier level, when the modulation is
25%
33%
50%
100%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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