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Control Systems

Control Systems
For the polynomial , find the number of roots which lie on the right half of s-plane?

 4
 0
 2
 1

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Control Systems
The open loop transfer function of non unity negative feedback system is , then the number of root locus branches equal to

 0.
 1.
 3.
 2.

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Control Systems
The phase margin of a system having the loop transfer function G(s)H(s) = 2√3/s(s+1) is

 30°
 60°
 80°
 45°

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Control Systems
Error constants of a system are a measure of

 steady state response.
 transient state response.
 relative stability.
 steady state response as well as transient state response.

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Control Systems
The maximum phase lag occurs at the ------------------- of the two corner frequencies?

 either 1 or 2
 arithmetic mean
 geometric mean
None of these

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Control Systems
A proportional plus integral controller

 it increases rise time
 increases the stability of the system
 has high sensitivity
 both 2 and 3

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