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Control Systems

Control Systems
The closed loop transfer function of a system is 25/(s² + 25). The settling time of the system is

 1 sec
 25 sec
 ∞ sec
 5 sec

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Control Systems
A unity feedback control system has forward loop transfer function as e-Ts/s(s+1). Its phase value will be zero at frequency ω1. Which of the following equations should be satisfied by ω1?

 ω1 = cot(Tω1)
 Tω1 = cot(ω1)
 Tω1 = tan(ω1)
 ω1 = tan(Tω1)

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

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Control Systems
A transfer function has its zero in the right half of the s-plane. The function

 is positive real
 is minimum phase
 will give stable impulse response
 is non-minimum phase

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Control Systems
Which of the following is/are represents the lead compensator?

 (s+5)/(s+6)
 (s+2)/(s+5)
 both 2 and 3
 (s+2)/(s+1)

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Control Systems
The impulse response of the system described by the differential equation will be

 e-3t u(t).
 (1/3) × (1-e-3t).
 1/3.
 e6t.

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