Electronics and Communication Engineering - Exam Questions Papers

1.
The resolution of a DAC depends on which of the following?
The number of bits
Monotonicity
Reference voltage
The values of resistance
Explanation:
No answer description is available. Let's discuss.

2.
When number of quantization levels are two; then the average transmission power in NRZ polar signaling is __________ that of NRZ unipolar signaling
1/2
1/4
1/8
none of these
Explanation:
No answer description is available. Let's discuss.

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?
Sy(f) > 0 for all f
Sy(f) = 0 for |f| > 1kHz
Sy(f) = 0 for f = nf0, f0 = 2kHz, n any integer
Sy(f) = 0 for f = (2n + 1)f0 = 1 kHz, n any integer
Explanation:
No answer description is available. Let's discuss.

4.
In the following astable multivibrator circuit, which properties of v0(t) depends on R2?
Only the frequency
Only the amplitude
Both the amplitude
Neither the amplitude nor the frequency