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Control Systems

Control Systems
What is the type of closed loop system for the plant transfer function G(s) = k/s²(1+Ts) and with unity feedback?

 2
 0
 3
 1

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Control Systems
When the system gain is doubled the gain margin becomes?

None of these
 Remains unaffected
 2 times
 1/2 times

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Control Systems
Transfer function of a control system depends on

 nature of input.
 nature of output.
 initial conditions of input and output.
 system parameters alone.

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Control Systems
A linear time invariant system, initially at rest when subjected to a unit step input gave response c(t) = te-t (t ≥ 0). The transfer function of the system is

 1/s(s+1)2
 (s+1)2/s
 s/(s+1)
 s/(s+1)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?

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

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Control Systems
Which of the following are the disadvantages of a closed loop control system?

All of these
 Complex and costly.
 Oscillatory response.
 Reduces the overall gain.

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