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Control Systems

Control Systems
The steady state error due to ramp input for a type two system is equal to

 zero.
 infinite.
 non zero number.
 constant.

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

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Control Systems
Advantages of open loop control system is/are

 accurate.
All of these
 reliable.
 simple and economical.

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Control Systems
Time response for a second order system depends on value of ξ. If ξ = 1 then the system is called as

 undamped system.
 critically damped system.
 under damped system.
 over damped system.

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Control Systems
Consider the following statements for phase lead compensation:

 nether 1 nor 2
 both 1 and 2
 Phase lead compensation shifts the gain crossover frequency to the right
 The maximum phase lag occurs at the arithmetic mean of the two corner frequencies.

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Control Systems
The impulse response of a system is c(t) = -te-t + 2 e-t (t>0). Its open loop transfer function is

 (2s+2)/s²
 (2s+1)/s²
 (2s+2)/(s+1)²
 (2s+1)/(s+1)²

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