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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 8
16.
The PSD and the power of a signal g(t) are respectively Sg(ω) and Pg, the PSD and the power of signal a.g(t) are respectively
aS2g (ω) and a2Pg
aSg2 (ω) and aPg
aSg (ω) and a2Pg
aSg (ω) and aPg
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
In a 100% amplitude modulated signal, the power in the upper sideband when carrier power is to be 100 W and modulation system SSBSC, is
100 W
66 W
50 W
25 W
Answer: Option
Explanation:

Modulation index = 100% 1

Pc = 100 W

.

18.
The simplest method of suppression of unwanted side band in AM is
filter method
phase shift method
third method
both (a) and (b)
Answer: Option
Explanation:

Unwanted frequency is removed by filtering.

19.
For attenuation of low frequencies we should use
shunt capacitance
series capacitance
shunt inductance
series inductance
Answer: Option
Explanation:

Series capacitance has high reactance for low frequencies.

20.

Assertion (A): A colour TV uses a SAW filter to give stable band pass response and high gain.

Reason (R): Devices using SAW principle are used in many systems.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Answer: Option
Explanation:

SAW means Surface Acoustic Wave. SAW filter is very commonly used in TV sets.

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