Nyquist Criteria

Question 1

The criterion used for pulse shaping to avoid ISI is

a. Nyquist criterion
b. Quantization
c. Sample and hold
d. PLL

Answer 1

Nyquist criterion

Question 2

Nyquist criterion helps in

a. Transmitting the signal without ISI
b. Reduction in transmission bandwidth
c. Increase in transmission bandwidth
d. Both a and b

Answer 2

Both a and b

Question 3

The Nyquist theorem is

a. Relates the conditions in time domain and frequency domain
b. Helps in quantization
c. Limits the bandwidth requirement
d. Both a and c

Answer 3

Both a and c

Question 4

The difficulty in achieving the Nyquist criterion for system design is

a. There are abrupt transitions obtained at edges of the bands
b. Bandwidth criterion is not easily achieved
c. Filters are not available
d. None of the above

Answer 4

There are abrupt transitions obtained at edges of the bands

Question 5

Zero forced equalizers are used for

a. Reducing ISI to zero
b. Sampling
c. Quantization
d. None of the above

Answer 5

Reducing ISI to zero

Question 6

ISI may be removed by using

a. Differential coding
b. Manchester coding
c. Polar NRZ
d. None of the above

Answer 6

Differential coding

Question 7

In uniform quantization process

a. The step size remains same
b. Step size varies according to the values of the input signal
c. The quantizer has linear characteristics
d. Both a and c are correct

Answer 7

Both a and c are correct

Question 8

Roll – off factor is defined as

a. The bandwidth occupied beyond the Nyquist Bandwidth of the filter
b. The performance of the filter or device
c. Aliasing effect
d. None of the above

Answer 8

The bandwidth occupied beyond the Nyquist Bandwidth of the filter

Question 9

Define Nyquist rate.

Answer 9

Let the signal be bandlimited to „W‟ Hz. Then Nyquist rate is given as,

Nyquist rate = 2W samples/sec
Aliasing will not take place if sampling rate is greater than Nyquist rate