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Control Systems

Control Systems
The characteristic equation has the following roots for over damped stable system?

 -2±j4
 -2,2
 -2,-4
 -2,-2

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Control Systems
Which of the following is/are represents the lead compensator?

 both 2 and 3
 (s+2)/(s+1)
 (s+5)/(s+6)
 (s+2)/(s+5)

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Control Systems
What is the open loop DC gain of a unity feedback control system having closed loop transfer function as

 4/13
 4/9
 13/4
 9/4

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Control Systems
Consider the function F(s) = ω/(s²+ω²). Where F(s) = Laplace transform of f(t). The final value of f(t) is equal to

 a value between -1 and +1
 infinite
 finite constant
 zero

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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

 2∠90°
 0.5∠10°
 0.5∠0°
 1∠0°

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Control Systems
Error constants of a system are a measure of

 transient state response.
 relative stability.
 steady state response as well as transient state response.
 steady state response.

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