Which of the following points is NOT on the root locus of a system with the open-loop transfer function G(s)H(s)=K/ s(s + 1)(s + 3)

1.  s = -j√3,

2.  s =- 1.5

3.   s=- 3

4.  s=-∞

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4
Correct Answer :

s =- 1.5


Explanation :
No Explanation available for this question

The characteristic equation Of a feedback control system is given by s3 + 5s2 + (K +6) s + K = 0 where K > 0 is a scaler variable parameter. In the root-loci diagram ,of the: system, the, asymptotes of the root-locus four large values of K meet at a point in the s-plane, whose coordinates are

1.  (-3, 0)

2.  (- 2, 0)

3.  (- 1, 0)

4.  (2, 0)

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4
Correct Answer :

(- 2, 0)


Explanation :
No Explanation available for this question

A unity feedback System has an open-loop transfer ,function of the form KG(s)=K(s+a)/s2(s+b);b>a Which of the loci shown in the figure can be valid -loci for the system

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

A unity feedback system has an open loop transfer function, G(s) = K/s2 The root locus plot is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

For a gain constant K, the phase-lead compensator

1.  reduces the slope of the magnitude curve in the entire range of frequency domain

2.  decreases the gain cross-over frequency

3.  reduce the phase margin

4.  reduce the resonance peak Mp.

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4
Correct Answer :

reduces the slope of the magnitude curve in the entire range of frequency domain


Explanation :
No Explanation available for this question

Consider the following statements Lead compensator 1. increases the margin of stability 2. speeds up transient response 3. does not affect the system error constant Of these statements

1.  2 and 3 are correct

2.  1 and 2 are correct

3.  1 and 3 are correct

4.  1, 2 and 3 are correct

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4
Correct Answer :

1 and 2 are correct


Explanation :
No Explanation available for this question

The maximum phase shift that can be provided by lead compensator with transfer function G(s)=1+6s/1+2s is

1.  15o

2.  30o

3.  45o

4.  60o

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4
Correct Answer :

30o


Explanation :
No Explanation available for this question

The transfer function of a compensating network is of the form (1+αTs)/(1+Ts).If this is a phase-lag network, the value of α should be

1.  exactly equal to 1

2.  between 0 and 1

3.  exactly equal to 1

4.  greater than 1

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4
Correct Answer :

between 0 and 1


Explanation :
No Explanation available for this question

It x is the system reactance and r is its resistance, the power transferred is maximum when

1.  x =r

2.  x =√2 r

3.  x=√3r

4.   x = 2r

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4
Correct Answer :

x=√3r


Explanation :
No Explanation available for this question

A phase-lag compensation will

1.  improve relative stability

2.  increase the speed of response

3.  increase bandwidth

4.  increase overshoot

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4
Correct Answer :

increase overshoot


Explanation :
No Explanation available for this question
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