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Control Systems

Control Systems
Resonant peak of a marginally stable system is

 0
 infinite
 finite value
 any of the above

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Control Systems
Certain control system has input u(t) and output c(t). If the input is first passed through a block having transfer function e-s and unit gain is applied to the applied to the system. The modified output will be

 c(t).u(t-1)
 c(t-1).u(t)
 c(t)u(t)
 c(t-1).u(t-1)

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Control Systems
The input-output relationship of a linear time invariant continuous time system is given by r(t) = d²c(t)/dt² + 3 dc(t)/dt + 2 c(t) Where r(t) and c(t) are input and output respectively. What is the transfer function of the system equal to?

 1/(s² + s + 2)
 2/(s² + 3s + 2)
 2/(s² + s + 2)
 1/(s² + 3s + 2)

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Control Systems
Which of the following is the correct expression for the transfer function of an electrical RC phase lag compensating network?

 C/(1+RCS)
 1/(1+RCS)
 RCS/(1+RCS)
 RC/(1+RCS)

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Control Systems
The Laplace transformation of f(t) is F(S) given the final value of f(t) is

 Infinite.
 One.
 Zero.
 None of them.

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Control Systems
A proportional plus derivative controller

 has high sensitivity
 improves the steady state accuracy
 increases the stability of the system
 both 1 and 2

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