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25.

The open-loop transfer function of a unity feedback control system is given by
G(s) = Ke^-Ts
where K and T are constants and these are greater than zero. The stability of closed-loop system depends on which of the following?
(a) K only
(b) Both K and T
(c) T only
(d) Neither on K nor on T

asked in Electrical Paper-1, 2007

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26.

Which one of the following is the correct statement?
The rotor resistance to reactance ratio and the moment of inertia of an AC servomotor in comparison to an ordinary 2H induction motor of similar rating are, respectively,
(a) lower and lower
(b) lower and higher
(c) higher and higher
(d) higher and lower

asked in Electrical Paper-1, 2007

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27.

Consider the following statements regarding Routh-Hurwitz criterion for stability
1. Routh-Hurwitz criterion is a necessary and sufficient condition for stability.
2. The relative stability is dictated by the location of the roots of the characteristic equation.
3. A stable system is a dynamic system with a bounded response to a bounded input.
Which of the statements given above are correct?
(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3

asked in Electrical Paper-1, 2007

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28.

For a unity feedback control system with forward path transfer function G(s) = K/(s+5), what is error transfer function ω_e(s) used for determination of error coefficients?
a. K/(s+5)
b. K/(s+K+5)
c. (s+5)/(s+K+5)
d. K(s+5)/(s+K+5)

asked in Electrical Paper-1, 2007

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29.

Output rate control is used to improve the damping of the system given in the figure. If the closed-loop system is required to have a damping factor of 0.5, what is the value of K_o?

(a) 4
(b) 1
(c) 1/4
(d) 6

asked in Electrical Paper-1, 2007

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30.

Which one of the following is the correct statement?
For the minimum phase system to be stable,
(a) phase margin should be negative and gain margin positive
(b) phase margin should be positive and gain margin negative
(c) both gain margin and phase margin should be positive
(d) both gain margin and phase margin should be negative

asked in Electrical Paper-1, 2007

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