A video transmission system transmits 625 picture frames per second. Each frame consists of a 400 X 400 pixel grid with 64 intensity levels per pixel. The date rate of the system is

1.  16 Mbps

2.  100 Mbps

3.  600 Mbps

4.  6.4 Gbps

View Answer  
4
Correct Answer :

600 Mbps


Explanation :
No Explanation available for this question

Let U and V be two independent zero mean Gaussian random variables of variances (1/4) and (1/9) respectively. The probility p(3V ≥ 2U) is

1.   4/9

2.  ½

3.  2/3

4.  5/9

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4
Correct Answer :

½


Explanation :
No Explanation available for this question

Let U and V be two independent and identified distributed random variables such that p(U=+1)=P(U=-1)=1/2. The entropy H(U+V) in bits is

1.   ¾

2.  1

3.  3/2

4.  lod23

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4
Correct Answer :

3/2


Explanation :
No Explanation available for this question

A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through

1.  An RC filter

2.  An envelope detector

3.  A PLL

4.  An ideal low-pass filter with the appropriate bandwidth

View Answer  
4
Correct Answer :

An ideal low-pass filter with the appropriate bandwidth


Explanation :
No Explanation available for this question

The bit rate of a digital communication system is R kbits/s. The modulation used is 32-QAM. The minimum bandwidth required for ISI free transmission is

1.   R/10 Hz

2.  R/10 kHz

3.  R/5 Hz

4.  R/5 kHz

View Answer  
4
Correct Answer :

R/10 kHz


Explanation :
No Explanation available for this question

A 4 GHz carrier is DSB-SC modulated by a pass message signal with maximum frequency of 2 MHz. The resultant signal is to be ideally sampled. The minimum frequency of the sampling impulse train should be

1.   4 MHz

2.  8 MHz

3.  8 GHz

4.  8.00 GHz

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4
Correct Answer :

8 MHz


Explanation :
No Explanation available for this question

In a BPSK signal defector, the local oscillator has a fixed phase error of 200. This phase error deteriorates the SNR at the output by a factor of

1.  cos 200

2.  cos2 200

3.  cos 700

4.  cos2 700

View Answer  
4
Correct Answer :

cos2 200


Explanation :
No Explanation available for this question

The Nyquist sampling interval, for the signal sinc(700t)+sinc (500t) is

1.   1/350 sec

2.  π/350 sec

3.  1/700 sec

4.  π/175 sec

View Answer  
4
Correct Answer :

1/700 sec


Explanation :
No Explanation available for this question

The Nyquist sampling rate for the signal s(t)=sin(500πt)/πt x sin(700πt)/πt is given by

1.   400 Hz

2.  600 Hz

3.  1200 Hz

4.  1400 Hz

View Answer  
4
Correct Answer :

1200 Hz


Explanation :
No Explanation available for this question

The value of the parameter α(in V-1) is

1.  1010

2.   107

3.  1.414 x 10-10

4.  2 x 10-20

View Answer  
4
Correct Answer :

107


Explanation :
No Explanation available for this question
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