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Control Systems

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

 45°
 80°
 30°
 60°

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Control Systems
Which of the following statements is/are true?

 nether 1 nor 2
 Centroid may be a part of root locus
 both 1 and 2
 Centroid may not be a part of root locus

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Control Systems
The characteristic equation of a control system is given by What are the angles of asymptotes of the root loci for k ≥ 0?

 120°, 180°, 240°
 0°, 120°, 240°
 0°, 180°, 300°
 60°, 180°, 300°

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Control Systems
Number of sign changes in the entries in 1st column of Routh array denotes the no. of

 roots of characteristic polynomial in RHP.
 zeroes of system in RHP.
 open loop poles in RHP.
 open loop zeroes in RHP.

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Control Systems
The magnitude condition for root locus is ..................

 |G(s)H(s)| = ∞
 |G(s)H(s)| = 1
 |G(s)H(s)| = 2
 |G(s)H(s)| = 0

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Control Systems
Slope of asymptote in Bode plot of 2nd order system is _____________________ per octave.

 3 dB
 18 dB
 12 dB
 6 dB

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