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Control Systems

Control Systems
The Laplace transform of a transportation lag of 5 seconds is

 e-5s.
 1/(s+5).
 e5s.
 1/(s-5).

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Control Systems
A property of phase lead compensation is that the

 overshoot is increased.
 bandwidth of closed loop system is reduced.
 rise time of closed loop system is reduced.
 gain margin is reduced.

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Control Systems
The type of a control system is obtained from -------------- transfer function?

 none of above.
 closed loop
 open loop
 both open loop and closed loop

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Control Systems
The characteristic equation of a control system is given by What are the angles of asymptotes of the root loci for k ≥ 0?

 0°, 180°, 300°
 0°, 120°, 240°
 120°, 180°, 240°
 60°, 180°, 300°

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

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

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Control Systems
In frequency response analysis of second order system, the error at corner frequency is

 20 log2ξ
 10 logξ
 -20 log2ξ
 -10 logξ

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