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Control Systems

Control Systems
If a body has identical properties all over, it is known as

 isotropic.
 none of them.
 homogeneous.
 elastic.

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Control Systems
Sparking between the contacts can be reduced by inserting

  a capacitor in parallel with the contacts.
 a resistor in the line.
 a reactor in the line.
 a capacitor in series with the contacts.

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Control Systems
The transfer function of a system is given as below, if a = 0.1, then the steady state error to unity ramp input will be

 0.25.
 0.49.
 0.16.
 0.35.

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

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Control Systems
The transfer function of a system is G(s) = 100/((s+1)(s+100)). For unit step input to the system the approximate settling time for 2% criterion is

 400 sec
 10 sec
 100 sec
 4 sec

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Control Systems
Find the corner frequency for the following transfer function? G(s) = 1/(s+2)

 4 rad/s
 1/2 rad/s
 2 rad/s
 1/4 rad/s

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