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Control Systems

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

 1/2 times
 2 times
 Remains unaffected
None of these

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Control Systems
A open loop transfer function is given as G(s) = (s+2)/(s+1)(s-1). Find the number of encirclements about '-1+j0'?

 2
 1
 3
 0

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Control Systems
For type 1 system with parabolic input, the steady state error is

 indeterminate.
 zero.
 finite constant.
 infinite.

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Control Systems
A property of phase lead compensation is that the

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

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

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Control Systems
In force-current analogy, electrical analogous quantity for displacement (x) is

 capacitance.
 flux.
 inductance.
 voltage.

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