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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 10
26.
In FDM systems used for telephone, which modulation scheme is adopted?
AM
DSB-SC
SSB-SC
FM
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
In the above case if another sine wave corresponding to 40% modulation is transmitted simultaneously, the total radiated power will be
9.9 kW
10.15 kW
10.84 kW
18.4 kW
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
A pre-emphasis circuit
boosts base frequencies
pre amplifies the complete audio band
amplifies higher audio frequencies
converts FM into phase modulation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
In orthogonal BFSK, the energy of information bearing term is
the same as total transmitted energy
one-half of total transmitted energy
one-fourth of total transmitted energy
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
In a tape recorder
both record and erase heads have high permeability core
the record head has high permeability core but the erase head has low permeability core
the record head has low permeability core but the erase head has high permeability core
both record and erase heads have low permeability core
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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