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Control Systems

Control Systems
Find the Laplace transform for sinωt?

 s/(s²+ω²)
 1/s
 ω/(s²+ω²)
 1/s²

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Control Systems
If the magnitude of G(jω)H(jω) at phase crossover frequency is 0.5. Find the gain margin of the given system?

 2
 1
 4
 0.5

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Control Systems
Which of the following is the electrical analogous element for displacement in force-voltage analogy?

 Charge.
 Current.
 Voltage.
 Flux.

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Control Systems
A function y (t) satisfies the following differential equation : Where, δ (t) is the delta function. Assuming zero initial condition and denoting the unit step function by u(t), y(t) can be formed as

 e-tu(t).
 e-t.
 etu(t).
 et.

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Control Systems
Find the relation of damped natural frequency (ωd)

 (ωn) √(1-4ζ²)
 (ωn) √(1-2ζ²)
 (ωn) √(1-1/ζ²)
 (ωn) √(1-ζ²)

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Control Systems
Which system is also known as automatic control system?

 Closed loop control system
 Either 1 or 2
 Nether 1 nor 2
 Open loop control system

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