# Time Domain Analysis – 1 – 4

16. For a second – order critically – damped system, the poles are :

(a) Purely imaginary
(b) complex conjugate of each other
(c) real and equal
(d) real and unequal

EXPLANATION
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17. The error signal in a control system is :

(a) the difference between the measured value and the set value
(b) the sum of measured value and set value
(c) the ratio of measured value to set value
(d)
none of these

EXPLANATION
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18. The impulse response of a system is :

(a) the inverse Laplace transform of its transfer function
(b) the inverse Laplace transform of G(s)
(c) the inverse Laplace transform of G(s)H (s)
(d) none of these

EXPLANATION
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19. For a second – order critically – damped system, the poles are :

(a) Purely imaginary
(b) complex conjugate of each order
(c) real and equal
(d) real and unequal

EXPLANATION
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20. A unit – impulse signal has zero value everywhere except at t=0, where its magnitude is :

(a) unity
(b) small finite value
(c) infinity
(d) none of these

EXPLANATION
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