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Control Systems

Control Systems
The value of 'a' in to give phase margin = 45o will be

 0.707.
 1.414.
 0.9.
 1.18.

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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

 zero
 unity
 0.707
 infinite

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Control Systems
Adding a pole to a system transfer function in terms of compensator represents a --------------- compensator ?

 lag
 lead
 lead-lag
 lag-lead

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Control Systems
The following transfer function represents a phase-lead compensator?

 1/s
 (s+4)/(3s+6)
 (s+4)/(s+6)
 (4s+2)/(6s+1)

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Control Systems
Find the Laplace transform for sinωt?

 s/(s²+ω²)
 1/s
 ω/(s²+ω²)
 1/s²

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Control Systems
The closed loop transfer function of a unity feedback control system is 9/(s² + 3s + 9), then the type of the system is

 1
 3
 0
 2

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