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CONTROL SYSTEMS

Control Systems
Resonant peak of a marginally stable system is

 0
 any of the above
 finite value
 infinite

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Control Systems
When the system gain is doubled the gain margin becomes?

 Remains unaffected
None of these
 2 times
 1/2 times

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Control Systems
A open loop transfer function is given as G(s) = (s+2)/(s+1)(s-1). Find the number of encirclements about '-1+j0'?

 0
 2
 3
 1

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Control Systems
Find the stability for the following transfer function G(s) = 50/s(s+5) ?

 Critically stable
 Unstable
 Marginally stable
 Stable

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

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

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