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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 22
21.
One of the advantages of base modulation over collector modulation of a transistor class C amplifier is
improved efficiency
better linearity
high power output per transistor
the lower modulating power requirement
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
If carrier modulated by a digital bit stream had one of the possible phases of 0°, 90°, 180°, 270°, then the modulation is called.
BPSK
QPSK
QAM
MSK
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
In FM, when the bandwidth is doubled, the signal to noise ratio improves by a factor of
2 dB
4 dB
6 dB
8 dB
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Pilot-carrier transmission is one in which
only one sideband is transmitted
one sideband and carrier are transmitted
only two sidebands are transmitted
two sidebands as well as a trace of carrier are transmitted
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
AM-SC stands for
Amplitude Modulated-Suppressed Carrier
Amplitude Modulated-Single Carrier
Amplitude Modulated-Synchronous Carrier
Amplitude Modulated-Self Carrier
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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