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Control Systems

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

 4/13
 13/4
 4/9
 9/4

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Control Systems
The output of the system has an effect upon the input quantity, then the system is a

 open loop control system.
 closed loop control system.
 either 1 or 2.
None of these

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Control Systems
What will be the type of the system, if the steady state performance of control system yields a non zero finite value of the velocity error constant?

 type - 2
 type - 1
 type - 0
 type - 3

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

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

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Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If the gain k is increased to infinity, then damping ratio will tend to become

 0.707
 unity
 zero
 infinite

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Control Systems
In polar plots if the critical point '-1+j0' is enclosed then the system is --------

 stable
 unstable
 marginally stable
 critical stable

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