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Control Systems

Control Systems
For a unity feedback control system open loop transfer function then position error constant is

 20.
 infinity.
 0.
 40.

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Control Systems
The phase margin of a system having the loop transfer function G(s)H(s) = 2√3/s(s+1) is

 45°
 60°
 80°
 30°

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

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Control Systems
Which of the following are the disadvantages of a closed loop control system?

All of these
 Complex and costly.
 Reduces the overall gain.
 Oscillatory response.

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Control Systems
The transfer function of the control system depends on

 nature of the output.
 nature of the input.
 the system parameters alone.
 initial conditions of input and output.

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Control Systems
The open loop transfer function for unity feedback system is given by 5(1+0.1s) / (s(1+5s)(1+20s)) Find the steady state error for a step input of magnitude 10 is equal to

 infinite.
 5.
 zero.
 2.

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