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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 16
41.
In FSK no synchronous carrier is needed at the receiver
true
false
depend on distance
none
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
The constellation diagram of a modem has four states as shown in the figure given below. What is the bit rate of this modem?
Two times its band rate
Four times its band rate
Same as band rate
Sufficient information is not given to give the answer
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant. The modulation system is
FM
AM
phase modulation
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
Vividh Bharti programme is transmitted in
short wave
medium frequency
all of the above
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
In a Vidicon camera tube, the beam current is controlled by
grid G1
grid G2
grids G1, G2, G3
grid G2, G3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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