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Control Systems

Control Systems
The value of 'a' in to give phase margin = 45o will be

 1.414.
 0.9.
 1.18.
 0.707.

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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?

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

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Control Systems
Poles and zeros are arranged alternatively on negative real axis, then type of network is/are

 LC network.
 RL network.
 Both 2 and 3.
 RC network.

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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
 100% of the final value
 50% of the final value

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Control Systems
Force balancing equation for elastic element (K) is (where, x = displacement)

 K d2x/dt2
 K dx/dt
None of these
 K *x

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Control Systems
Which of the following transfer functions represent under damped second order systems?

 2/(s² + 2s + 2)
 1/(s² + s + 1)
All of these
 4/(s² + 2s + 4)

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