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Control Systems

Control Systems
The unit step error coefficient of a system with unity feedback is

 0.
 infinity.
 1.
 1/6.

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Control Systems
The unit step response of the system is 1 - e-t(1+t). Which is the system?

 critically stable
 oscillatory
 unstable
 stable

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Control Systems
The initial slope of Bode plot for a transfer function having no poles at the origin is

 +10dB/decade.
 -20dB/decade.
 -10dB/decade.
 0 dB/decade

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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?

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

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Control Systems
Poles and zeros are arranged alternatively on negative real axis, then type of network is/are

 RC network.
 RL network.
 Both 2 and 3.
 LC network.

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Control Systems
Which of the following statements is/are true?

 nether 1 nor 2
 Centroid may not be a part of root locus
 both 1 and 2
 Centroid may be a part of root locus

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