Electronics and Communication Engineering - Communication Systems

46.
The modulation index of an AM wave is changed from 0 to 1. The transmitted power is
unchanged
halved
increased by 50%
quadrupled
Answer: Option
Explanation:
No answer description is available. Let's discuss.

47.
In a radio receiver the input from local oscillator is fed to
RF amplifier
mixer
IF amplifier
detector
Answer: Option
Explanation:
No answer description is available. Let's discuss.

48.
A shadow zone does not receive any space wave
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.

49.
A radio frequency signal contains the following three frequencies :
850 kHz; 865 kHz and 875 kHz
In order to amplify this signal, which of the following amplifier should be selected?
Push pull amplifier
Wideband amplifier
Audio frequency amplifier
Tuned voltage amplifier
Answer: Option
Explanation:
No answer description is available. Let's discuss.

50.
Which of the following pulse-time modulation is least used?
PDM
PPM
PWM
PAM
Answer: Option
Explanation:
No answer description is available. Let's discuss.