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Control Systems

Control Systems
Open loop transfer function,

 band stop filter.
 all pass filter.
None of these
 band reject filter.

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Control Systems
A unity feedback control system has forward loop transfer function as e-Ts/s(s+1). Its phase value will be zero at frequency ω1. Which of the following equations should be satisfied by ω1?

 Tω1 = tan(ω1)
 Tω1 = cot(ω1)
 ω1 = cot(Tω1)
 ω1 = tan(Tω1)

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Control Systems
Time response for a second order control system depends on value of ξ. If ξ>1 then the system is called as

 critically damped system.
 under damped system.
 undamped system .
 over damped system.

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Control Systems
To achieve the optimum transient response, the indicating instruments are so designed as to

 provide damping which is slightly less than the critical value.
 be undamped.
 provide damping which is slightly more than the critical value.
 be critically damped.

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Control Systems
The error of a system to a ramp input is 1/5, if the type of the system is decreased by one, then the error of unit step input is

 6/5
 0.167
 0.2
 5

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Control Systems
Given the Laplace transform of f(t) = F(s), the Laplace transform of (f(t)e-at) is equal to

 F(s+a)
 e-as*F(s)
 eas*F(s)
 F(s)/(s+a)

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