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Control Systems

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

 0
 3
 2
 1

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Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If gain k is increased to infinity, then damping ratio will tend to become

 0.707
 unity
 zero
 infinite

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Control Systems
With regard to filtering property, the lead compensator is

 high pass filter
 band reject filter
 low pass filter
 bandpass filter

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Control Systems
A transfer function has a zero at s = -1 and poles at s = -1 ± j1. The multiplier being unity, if the input is step function, the steady state response is given by

 0.5∠0°
 0.5∠10°
 1∠0°
 2∠90°

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Control Systems
what is the Laplace transform of a function δ(t-2)?

 2
 0
 2s
 e-2s

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

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

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