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Control Systems

Control Systems
The characteristic equation for closed loop system is given as . The value of k for which the system becomes just stable is

 4
 8
 6
 2

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

 unstable
 critically stable
 stable
 oscillatory

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Control Systems
The transfer function of a system is 10/(1 + S) when operated as a unity feedback system, the steady state error to a unit step input will be

 Zero.
 10.
 1/11.
 ¾.

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Control Systems
Consider the following statements for phase lead compensation:

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

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

 20.
 40.
 infinity.
 0.

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Control Systems
What is the open loop DC gain of a unity feedback control system having closed loop transfer function as

 13/4
 9/4
 4/13
 4/9

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