Bandwidths of FM and PM respectively are

1.  204 kHz, 44 kHz

2.  202kHz, 22 kHz

3.   402 kHz, 42 kHz

4.  None of these

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4
Correct Answer :

202kHz, 22 kHz


Explanation :
No Explanation available for this question

Figure of merit when a signal tone modulating signal  f(t)=Em cos ωmt, will be

1.  1/4mf2

2.   1/2mf2

3.  1/3 mf2

4.   1/5 mf2

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4
Correct Answer :

1/2mf2


Explanation :
No Explanation available for this question

In an FM system with m(t)=cos31000t, kf=471000 carrier amplitude at receiver input 1/3 and channel noise PSD, Sn(ω)=N/2=10-8, frequency deviation is

1.  70kHZ

2.  80kHZ

3.  75kHZ

4.  85kHz

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4
Correct Answer :

75kHZ


Explanation :
No Explanation available for this question

In an FM system with white channel noise of PSD Sn(ω)=10-9 and base band signal m(T) with a BW as 15kHZ, output SNR=31 dB, output noise power(N0) will be Given m2/m2p=2/9, β=2; Demadulator constant, α=10-4

1.  0.0325

2.  0.0525

3.  0.0425

4.  0.0625

View Answer  
4
Correct Answer :

0.0625


Explanation :
No Explanation available for this question

Four signals each band-limited to 5kHZ are sampled at twice the Nyquist rate. The resulting PAM samples are transmitted over a single channel  after time division multiplexing. Theoretical minimum transmissions bandwidth of the channel should be equal to

1.  5kHZ

2.  20kHZ

3.  40kHZ

4.  80kHZ

View Answer  
4
Correct Answer :

80kHZ


Explanation :
No Explanation available for this question

In a PCM system, each quantization level is encoded into 8 bits. The signal to quantization noise is equal

1.  1/12(1/256)2

2.   48 dB

3.  64 dB

4.  256 db

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4
Correct Answer :

48 dB


Explanation :
No Explanation available for this question

A band-pass signal has significant frequency components in the range of 1.5MHz to 2MHz. If signal is to be reconstructed from its sample, then minimum sampling frequency will be

1.  1MHZ

2.  2MHz

3.  3.5MHz

4.  4MHz

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4
Correct Answer :

1MHZ


Explanation :
No Explanation available for this question

A television signal is sampled at a rate of 20% above the Nyquist rate. The signal has a bandwidth of 6 MHz. The samples are quantized into 1024 levels. The minimum bandwidth required to transmit this sign. would be

1.  72 M bits/sec

2.  144 M bits/sec

3.  72 k bits/sec

4.  144 k bits/sec

View Answer  
4
Correct Answer :

144 M bits/sec


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

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4
Correct Answer :

256 kbps


Explanation :
No Explanation available for this question

In a carrier  telephone system, a group occupies

1.  36 to 98 kHz

2.  60 to 108 kHz

3.   92 to 140 kHz

4.  140 to 172 kHz

View Answer  
4
Correct Answer :

36 to 98 kHz


Explanation :
No Explanation available for this question
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