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Control Systems

Control Systems
Advantages of open loop control system is/are

All of these
 simple and economical.
 accurate.
 reliable.

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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
 lead-lag

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Control Systems
The transfer function of a plant is T(s) = 5/(s+5)(s² + 5 + 1). The second order approximation of T(s) using dominant pole concept is

 5/(s+1)(s+5)
 1/(s² + 5 + 1)
 5/(s² + 5 + 1)
 1/(s+1)(s+5)

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Control Systems
A second order control system is defined by the following equation: 4 d²c(t)/dt² + 8 dc(t)/dt + 16 c(t) = 16 u(t) The damping ratio and natural frequency for this system are respectively

 0.25 and 4 rad/s
 0.25 and 2 rad/s
 0.50 and 4 rad/s
 0.50 and 2 rad/s

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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?

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

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Control Systems
Consider a point S = -3 + j4 in the s-plane. Then for a system with the open loop transfer function ?

 S is on root locus
None of these
 S is not on root locus
 either 1 or 2

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