Consider the sequence x [n] = [-4 - j5   1 + j2    4]                                                      ↑ The conjugate anti-symmetric part of the sequence is

1.  [ -4 - j2.5      j2           4 - j2.5]

2.  [-j2.5    1     j2.5]

3.  [- j5     j2       0]

4.  [ -4       1          4]

View Answer  
4
Correct Answer :

[ -4 - j2.5      j2           4 - j2.5]


Explanation :
No Explanation available for this question

A casual LTI system is described by the difference equation 2y[n] = αy [n - 2] - 2x [n] + βx [n - 1] The system is stable only if

1.  | α | = 2, | β | < 2

2.  | α | > 2, | β | > 2

3.  | α | < 2, any value of β

4.  | β | < 2, any value of α

View Answer  
4
Correct Answer :

| α | < 2, any value of β


Explanation :
No Explanation available for this question

A causal system having  the  transfer  function H  (s) = 1/(s + 2)  is excited with 10u(t). The time at which the output reaches 99% of its steady state value is

1.  2.7 sec

2.  2.5 sec

3.  2.4 sec

4.  2.1 sec

View Answer  
4
Correct Answer :

2.4 sec


Explanation :
No Explanation available for this question

A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is

1.  -90°

2.   0°

3.  90°

4.  -180°

View Answer  
4
Correct Answer :

0°


Explanation :
No Explanation available for this question

The open-loop  transfer of a unity  feedback system  is G(s) = K/(s(s2 + s + 2)(s + 3)) The range of K for which the system is stable is

1.  (21/44) > K > 0

2.  13 > K > 0

3.  (21/4) < K < ∞

4.  -6 < K < ∞

View Answer  
4
Correct Answer :

(21/44) > K > 0


Explanation :
No Explanation available for this question

For the polynomial P(s) = s5 + s4 + 2s3 + 2s2 + 3s + 15,  the number of roots which  lie  in the right halt of the s-plane is

1.  4

2.  2

3.  3

4.  1

View Answer  
4
Correct Answer :

2


Explanation :
No Explanation available for this question

The state variable equation of a system are : 1.  x1 = -3x1 - x2 + u 2.  x2 = 2x1        y = x1 + u The system is

1.  controllable but not observable

2.  observable but not controllable

3.  neither controllable nor observable

4.  controllable and observable

View Answer  
4
Correct Answer :

controllable and observable


Explanation :
No Explanation available for this question

A 1 mW video signal having a bandwidth of 100 MHz is transmitted to a receiver through acable that has 40 dB loss. If the effective one-sided noise spectral density at the receiver is 10-20 Watt/Hz, then the signal to noise ratio at the receiver is

1.  50 db

2.  30 db

3.  40 db

4.  60 db

View Answer  
4
Correct Answer :

50 db


Explanation :
No Explanation available for this question

Two  sinusoidal  signals  of  same  amplitude  and  frequencies  10  kHz  and  10.1  kHz  are added  together. The combined signal  is given  to an  ideal  frequency detector. The output of the detector is

1.  0.1 kHz sinusoid

2.  20.1 kHz sinusoid

3.   a linear function of time

4.  a constant

View Answer  
4
Correct Answer :

20.1 kHz sinusoid


Explanation :
No Explanation available for this question

Consider  a  binary  digital  communication  system  with  equally  likely  0's  and  1's.  When binary 0 is transmitted the voltage at the detector input can lie between the levels -0.25 V and  +0.25  V  with  equal  probability:  when  binary  1  is  transmitted,  the  voltage  at  the detector can have any value between 0 and 1 V with equal probability. If the detector has a threshold of 2.0 V (i.e., if the received signal is greater than 0.2 V, the bit is taken as 1), the average bit error probability is

1.  0.15

2.  0.2

3.  0.05

4.  0.5

View Answer  
4
Correct Answer :

0.15


Explanation :
No Explanation available for this question
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