Noise with double-sided power spectral density of K over all frequencies is passed through a RC low pass filter with 3dB cut-off frequency of f. The noise power at the filter output is

1.  k

2.  K fc

3.  K πfc

4.  ∞

View Answer  
4
Correct Answer :

K πfc


Explanation :
No Explanation available for this question

Consider a Binary Symmetric Channel (BSC) with probability of error being p. To transmit abit,  say  1,  we  transmit  a  sequence  of  three  1s.  The  receiver  will  interpret the  received sequence to represent 1 if a least two bits are 1. The probability that the transmitted bit will be received in error is

1.  p3 + 3p2(1 - p)

2.  p3

3.  (1 - p)3

4.  p3 + p2(1 – p)

View Answer  
4
Correct Answer :

p3 + 3p2(1 - p)


Explanation :
No Explanation available for this question

The built in potential of the junction

1.  is 0.70V

2.  is 0.76V

3.  is 0.82V

4.  cannot be estimated from the data given

View Answer  
4
Correct Answer :

is 0.76V


Explanation :
No Explanation available for this question

Consider a Binary Symmetric Channel (BSC) with probability of error being p. To transmit abit,  say  1,  we  transmit  a  sequence  of  three  1s.  The  receiver  will  interpret the  received sequence to represent 1 if a least two bits are 1. The probability that the transmitted bit will be received in error is

1.  p3 + 3p2(1 - p)

2.  p3

3.  (1 - p)3

4.  p3 + p2(1 - p)

View Answer  
4
Correct Answer :

p3 + p2(1 - p)


Explanation :
No Explanation available for this question

Four message band  limited  to W, W, 2W and 3W respectively are  to be multiplexed using Time Division Multiplexing  (TDM).  The minimum  band width  required  for  transmission  of this TDM signal is

1.  w

2.  3W

3.  6W

4.  7W

View Answer  
4
Correct Answer :

7W


Explanation :
No Explanation available for this question

Consider the frequency modulated signal 10 cos[2π x 105t + 5sin(2π x 1500t) + 7.5sin(2π x 1000t] with carrier frequency of 105 Hz. The modulation index is

1.  12.5

2.  10

3.  7.5

4.  5

View Answer  
4
Correct Answer :

5


Explanation :
No Explanation available for this question

The peak electric field in the device is

1.  0.15 MV.cm-1, directed from p-region to n-region

2.  0.15 MV.cm-1, directed from n-region to p-region

3.  1.80 MV.cm-1, directed from p-region to n-region

4.  1.80 MV.cm-1, directed from n-region to p-region

View Answer  
4
Correct Answer :

0.15 MV.cm-1, directed from n-region to p-region


Explanation :
No Explanation available for this question

The signal cosωct – 0.5 cosωmt sinωct is

1.  FM only

2.  AM only

3.  both AM and FM

4.  neither AM nor FM

View Answer  
4
Correct Answer :

AM only


Explanation :
No Explanation available for this question

If  the bits 0 and 1 are  transmitted using bipolar pulses,  the minimum band width  required for distortion free transmission is

1.  64 kHz

2.  32 kHz

3.  8 kHz

4.  4 kHz

View Answer  
4
Correct Answer :

32 kHz


Explanation :
No Explanation available for this question

Which of the following statements is true

1.  G(s) is an all-pass filter

2.  G(s) has a zero in the right-half plane

3.  G(s) is the impedance of a passive network

4.  G(s) is marginally stable

View Answer  
4
Correct Answer :

G(s) is the impedance of a passive network


Explanation :
No Explanation available for this question
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