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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 22
6.
In PCM, bit duration is defined as
sampling period x total no. of bits
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.

Assertion (A): If frequency is high, the distance between transmitter and antenna may be an appreciable fraction of wavelength

Reason (R): Wavelength is inversely proportional to frequency.

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:
No answer description is available. Let's discuss.
8.
Speeds of sound and radio waves are equal.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
When Pc is the unmodulated carrier power and Pt is the total power in the modulated wave, then the maximum power in AM wave is
Pt = 1.5 Pc
Pt = 2.5 Pc
Pt = 2
Pt = 22 Pc
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
Thermal noise is passed through an ideal low pass filter having cut off at fc = ω Hz. The auto-correlation value of the noise at the output of the filter is given as
a delta function at t = 0
gaussian over the range -∞ ≤ t ≤ ∞
sin c function over the range -∞ ≤ t ≤ ∞
triangular function over the range
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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