Electronics and Communication Engineering - Exam Questions Papers

1. 

The resolution of a DAC depends on which of the following?

A. The number of bits
B. Monotonicity
C. Reference voltage
D. The values of resistance

Answer: Option A

Explanation:

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2. 

When number of quantization levels are two; then the average transmission power in NRZ polar signaling is __________ that of NRZ unipolar signaling

A. 1/2
B. 1/4
C. 1/8
D. none of these

Answer: Option B

Explanation:

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3. 

X(t) is a stationary process with the power spectral density Sx(f) > 0 for all f. The process is passed through a system shown below.

Let Sy, (f) be the power spectral density Y(t). Which one of the following statements is correct?

A. Sy(f) > 0 for all f
B. Sy(f) = 0 for |f| > 1kHz
C. Sy(f) = 0 for f = nf0, f0 = 2kHz, n any integer
D. Sy(f) = 0 for f = (2n + 1)f0 = 1 kHz, n any integer

Answer: Option D

Explanation:

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4. 

In the following astable multivibrator circuit, which properties of v0(t) depends on R2?

A. Only the frequency
B. Only the amplitude
C. Both the amplitude
D. Neither the amplitude nor the frequency

Answer: Option A

Explanation:

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5. 

If x(t) = 0 for t < 0 and x(t) contains no impulse or higher order singularities at t = 0. then

A.
B.
C.
D.

Answer: Option A

Explanation:

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