An electromechanical closed-loop control system has the following characterstic equation: s3+6Ks2+(K+2)s+8=0 where K is the forward gain of the system. The condition for closed loop stability is

1.  K=0.528

2.  K=2

3.  K=0

4.   K=-2.58

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4
Correct Answer :

K=0.528


Explanation :
No Explanation available for this question

None of the poles of a linear control system lie in the right half of s-plane. For a bounded input, the output of this system

1.  is always bounded

2.  could be unbounded

3.  always tends to zero

4.   none of these

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4
Correct Answer :

could be unbounded


Explanation :
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which of the following function is the transfer of a system having the Nyquist plot in the figure

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

The system shown in the figure remains stable when

1.  K

2.  -1

3.  1

4.   K>3

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4
Correct Answer :

K>3


Explanation :
No Explanation available for this question

The system with the open loop transfer function G(s)H(s)=has a gain margin of

1.  -6db

2.  0db

3.  3.5db

4.   6 db

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4
Correct Answer :

0db


Explanation :
No Explanation available for this question

The feedback control system shown in the figure is stable

1.  for all K≥0

2.  only if K≥1

3.  only if 0≤K

4.   only if 0≤K≤1

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4
Correct Answer :

only if 0≤K<1


Explanation :
No Explanation available for this question

Consider a unity feedback system whose open-loop transfer function is G(s)=The Nyquist plot for this system is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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For the certain unity feedback system G(s)=The Nyquist plot is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

The Nyquist plot of a system is shown in figure The open-loop transfer function is G(s)H(s)=The number of poles of closed loop system in are

1.  0

2.  1

3.  2

4.  4

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4
Correct Answer :

2


Explanation :
No Explanation available for this question

In the bode-plot of a unity feedback control system, the value of phase of G(jω) at the gain cross over frequency is -1250. The phase margin of the system is

1.  -1250

2.  -550

3.  550

4.  1250

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4
Correct Answer :

550


Explanation :
No Explanation available for this question
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