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Control Systems

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

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

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

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Control Systems
If the bandwidth of the system is very large, the system response is

None of these
 independent of bandwidth
 faster
 slower

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

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

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Control Systems
Which of the following are the disadvantages of a closed loop control system?

 Oscillatory response.
 Reduces the overall gain.
 Complex and costly.
All of these

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Control Systems
Find the corner frequency for the following transfer function? G(s) = 1/(s+2)

 2 rad/s
 1/4 rad/s
 4 rad/s
 1/2 rad/s

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