# In a DM (Delta modulation) system, the granular (idling) noise occurs when

1.  modulation signal increases rapidly

2.   pulse rate decreases

3.  modulating signal remains constant

4.  pulse amplitude decreases

4

modulation signal increases rapidly

Explanation :
No Explanation available for this question

# PAM signs. can be demodulated by using a

1.  low pass filter (LPF) alone

2.  Schmitt trigger followed by a LPF

3.  differentiator followed by a LPF

4.   clipper circuit followed by a LPF

4

differentiator followed by a LPF

Explanation :
No Explanation available for this question

# For 10-bit PCM system, the signal to quantisation noise ratio is 62 dB. If number of bits is increased by 2, then signal to quantisation noise will

1.  increase by 6 dB

2.   increase by 12 dB

3.   decrease by 6 dB

4.  decrease by 12 dB

4

decrease by 12 dB

Explanation :
No Explanation available for this question

# In a PCM system, if number of quantization levels are 16 and maximum signal frequency .4kHz then bit transmission rate is

1.  64 k bits/sec

2.  16 k bits/sec

3.  32 k bits/sec

4.  32 bits/sec

4

16 k bits/sec

Explanation :
No Explanation available for this question

# The signal to quantisation noise ratio in a PCM system depends upon

1.  sampling rate

2.  number of quantisation levels

3.  message signal bandwidth

4.  none of these

4

message signal bandwidth

Explanation :
No Explanation available for this question

# Bandwidth of a N bit binary coded PCM signal for modulating a signal having bandwidth of ‘f’ Hz is

1.  f/N Hz

2.   f/N2

3.   NfHz

4.  N2f Hz

4

NfHz

Explanation :
No Explanation available for this question

# In PCM system, if quantization levels are increased form 2 to 8, then relative bandwidth requirement will

1.  remain same

2.  become double

3.  become triple

4.  become four times

4

become triple

Explanation :
No Explanation available for this question

# PCM systems require regenerative repeaters over long distances. The correct sequence of ,the operations which such a repeater performs, is

1.  timing, equalization and decision making

2.  equalization, timing and decision making

3.  timing, thresholding(decision)and equalization

4.  none of these

4

equalization, timing and decision making

Explanation :
No Explanation available for this question

# Four voice signals, each limited to 4 kHz and sampled at Nyquist rate, are converted into binary pcm signal using 256 quantisation levels. The bit transmission rate for the time-division multiplexed signal will be

1.  8 kbps

2.   64 kbps

3.  256 kbps

4.  512 kbps

4

256 kbps

Explanation :
No Explanation available for this question

1.  5 kHz

2.  35 kHz

3.  70 kHz

4.   85 MHz

4