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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 25
1.
Which of the following is an indirect way of generating FM?
Armstrong modulator
Varactor diode modulator
Reactance FET modulator
Reactance bipolar transistor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
When the length of antenna is a whole wavelength
the radiation at right angles is zero
the radiation at right angles is maximum
the radiation is zero in all directions
the radiation is maximum in all directions
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
Circular polarization
is useful in reducing depolarization effect on received wave
involves critical alignment of transmitting and receiving antenna
is useful in discrimination between reception of adjacent beams
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.
102.3
113
70.2
80.9
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
If S represents the carrier synchronization at the receiver and r represents the bandwidth efficiency, then the correct statement for the coherent binary PSK is
r = 0.5, S is required
r = 1.0, S is required
r = 0.5, S is not required
r = 1.0, S is not required
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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