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Stability Theory – 1 – 2

6. The characteristic equation 1 + G(s) R(s) = 0 of a system is given by

     Mcq series

  For the system to remain stable, the value of gain K should be :

(a) zero
(b) greater than zero but less than 10
(c) greater than 10 but less than 20
(d) greater than 20 but less than 30

Answer
Answer : (b)

Explanation
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7. The transfer function of a control system is given as

    Mcq series
  where k is the gain of the system in radians/amp. For this system to be critically damped, the value of k should be :

(a) 1
(b) 2
(c) 3
(d) 4

Answer
Answer : (b)

Explanation
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8. The advantages of Nyquist stability test is/are :

(a) it guides in stabilising an unstable system
(b) it enables to predict closed loop stability from open loop results
(c) is is applicable to experimental results of frequency response of open loop system
(d) all of the above

Answer
Answer : (d)

Explanation
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9. The effect of adding poles and zeros can be determined quickly by :

(a) nicholas chart
(b) nyquist plot
(c) bode plot
(d) root locus

Answer
Answer : (b)

Explanation
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10. The root locus is a :

(a) time-domain
(b) frequency domain approach
(c) combination of both
(d) none of these

Answer
Answer : (a)

Explanation
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