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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 24
36.
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as
2E
3E
4E
6E
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
In TV systems, equalising pulses are sent during
horizontal blanking
vertical blanking
serrations
horizontal retrace
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
A carrier A cos ωct is modulated by a signal mt A cos ω1t + m2 A cos ω2t + m3 A cos ω3t. The total modulated power is
A2(1 + 0.5 m12 + 0.5 m22 + 0.5 m32)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is
16
15
8
1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
The main function of a balanced modulator is to
produce balanced modulation of a carrier wave
produce 100% modulation
suppress carrier signal in order to create a single-sideband or double sideband
limit noise picked by a receiver
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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