Q1:

In flat top sampling a hold circuit is sometimes required. This hold circuit can be designed as a sample followed by

Q2:

Match the list – I with List – II and select the correct answer using the code given below the lists.

LIST – I	LIST -II
a. Pilot carrier	1. Delta modulation
b. Tuned circuit	2. Frequency modulation
c. Slope overload	3.  PCM
d. A to D converter	4. Single sideband AM.

 

Q3:

PCM system has a range of $\pm 4$V and in to be encoded with 3 bits. The step size is

Q4:

In delta modulation, the slope overload distortion can be reduced by

Q5:

The Nyquist sampling interval, for the signal Sinc (700 t) + Sinc (500t) is :-

Q6:

If the number of bits per sample in a PCM system is increased from 5 to 6. The improvement in signal to quantization noise ratio will be

Q7:

The process of converting the analog sample into discrete form is called

Q8:

The expression for bandwidth BW of a PCM system, where n is the number of bits per sample and f_m is the modulating frequency, is given by

Q9:

In Delta modulation,

Q10:

In digital transmission, the modulation technique that requires minimum bandwidth is

Q11:

The digital modulation technique in which the step size is varied according to the variation in the slope of the input is called

Q12:

A signal as shown in the figure is applied to a matched filter. Which of the following does represents the output of the matched filter?

Q13:

Consider the signal x(t) shown in Fig. Let h(t) denote the impulse response of the filter matched to x(t), with h(t) being non-zero only in the interval 0 to 4 sec. The slope of h(t) in the interval 3 < t < 4 sec is

Q14:

The input to a linear delta modulator having a step-size $\Delta$= 0.628 is a sine wave with frequency f_m and peak amplitude E_m. If the sampling frequency f_x = 40 kHz, the combination of the sine-wave frequency and the peak amplitude, where slope overload will take place is

Q15:

Consider the following statements comparing delta modulation with PCM system : delta modulation requires:-

1. A lower sampling rate

2. A higher sampling rate

3. Small bandwidth