The  transfer  function  of  a  plant  is T(s)  =  5/((s  +  5)(s2  +  s  +  1)).  The  second-order approximation of T(s) using dominant pole concept is

1.  1/((s + 5)(s + 1))

2.  5/((s + 5)(s + 1))

3.  5/(s2 + s + 1)

4.  1/(s2 + s + 1)

View Answer  
4
Correct Answer :

5/(s2 + s + 1)


Explanation :
No Explanation available for this question

The  open-loop  transfer  function  of  a  plant  is  given as G(s)  =  1/(s2  -  1).  If  the  plant  is operated  in a unity  feedback configuration,  then  the  lead compensator  that can stabilize this control system is

1.  (10(s - 1))/(s + 2)

2.  (10(s + 4))/(s + 2)

3.  (10(s + 2))/(s + 10)

4.   (1(s + 2))/(s + 10)

View Answer  
4
Correct Answer :

(10(s - 1))/(s + 2)


Explanation :
No Explanation available for this question

A unity  feedback control system has an open-loop  transfer  function G(s) = K/(s(s2 + 7s +12)). The gain K for which  s = -1 + j1 will lie on the root locus of this system is

1.  4

2.  5.5

3.  6.5

4.  10

View Answer  
4
Correct Answer :

10


Explanation :
No Explanation available for this question

The  asymptotic  Bode  plot  of  a  transfer  function  is  as  shown  in  the  figure.  The  transfer function G(s) corresponding to this Bode plot is

1.  1/((s + 1)(s + 20))

2.  1/(s(s + 1)(s + 20))

3.  100/(s(s + 1)(s + 20))

4.   100/(s(s + 1)(1 + 0.05s))

View Answer  
4
Correct Answer :

100/(s(s + 1)(1 + 0.05s))


Explanation :
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The state space representation of a separately excited DC servo motor dynamics is given As where ω  is  the  speed  of  the motor,  i a  is  the  armature  current  and  u  is  the  armature voltage. The transfer function (ω(s))/(U(s)) of the motor is

1.  10/(s2 + 11s + 11)

2.  1/(s2 + 11s + 11)

3.   (10s + 10)/(s2 + 11s + 11)

4.   1/(s2 + s + 1)

View Answer  
4
Correct Answer :

10/(s2 + 11s + 11)


Explanation :
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In delta modulation, the slope overload distortion can be reduced by

1.  decreasing the step size

2.  decreasing the granular noise

3.   decreasing the sampling rate

4.  increasing the step size

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4
Correct Answer :

increasing the step size


Explanation :
No Explanation available for this question

The raised cosine pulse p(t) is used for zero ISI in digital communications. The expression for p(t) with unity roll-off factor is given by p(t) = (sin 4π Wt)/(4πWt(1 - 16 W2t2)).The value of p(t) at t = (1/4W) is

1.  -0.5

2.  0

3.  0.5

4.  ∞

View Answer  
4
Correct Answer :

0.5


Explanation :
No Explanation available for this question

In the following scheme, if the spectrum M(f) of m(t) is as shown, then the spectrum Y(f) of y(t) will be  

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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During  transmission  over  a  certain  binary  communication  channel,  bit  errors  occur independently with probability p. The probability of AT MOST one bit in error in a block of n bits is given by

1.  pn

2.  1 - pn

3.  np(1 - p)n - 1 + (1 - p)n

4.  1 - (1 - p)n

View Answer  
4
Correct Answer :

np(1 - p)n - 1 + (1 - p)n


Explanation :
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In  a GSM  system,  8  channels  can  co-exist  in  200  kHz  bandwidth  using  TDMA. A GSM based cellular operator is allocated 5 MHz bandwidth. Assuming a frequency reuse factor of    (1/5),  i.e.  a  five-cell  repeat  pattern,  the maximum  number  of  simultaneous  channels that can exist in one cell is

1.  200

2.  40

3.  25

4.  5

View Answer  
4
Correct Answer :

40


Explanation :
No Explanation available for this question
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