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Control Systems

Control Systems
Error at corner frequency ωcf of first order control system is -------

 ±4 db
 ±3 db
 ±2 db
 ±1 db

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Control Systems
The characteristic equation of a control system is give by s(s + 4)(s² + 2s + 1) + k(s + 1) = 0. Find the angle between the asymptotes?

 180°
 120°
 60°
 360°

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Control Systems
Find the angles of asymptotes of the open loop transfer function G(s) = k(s + 1)/((s(s+2)(s+4)?

 0°, 180°
 90°,180°
 90°,270°
 60°,240°

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Control Systems
Which of the following is/are the advantages of a closed loop control system?

 nether 1 nor 2.
 The closed loop systems are less affected by noise.
 both 1 and 2.
 The closed loop systems are accurate.

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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
Time constant is defined as the time taken by the response of the system to reach ----------- ?

 63% of the final value
 70.7% of the final value
 50% of the final value
 100% of the final value

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