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Automatic Control Systems

Answer: D

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22.

In a second order system with a unit step input, the speed of response is high if system is

Answer: D

An underdamped system with damping factor slightly less than 1 gives high speed of response.

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23.

In a second order undamped system, the poles are on

Answer: B

If poles are on imaginary axis the response is undamped and oscillatory.

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24.

For any test point s on the real axis, the sum of angular contributions of the complex conjugate poles is

Answer: D

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25.

Assertion (A): Potentiometers can not be used as error detectors in position control systems.

Reason (R): The resolution of a potentiometer places an upper limit on its accuracy

Answer: D

Potentiometers are used as error detectors.

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Answer: A

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27.

Nyquist stability criterion uses open loop frequency response characteristics.

Answer: A

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28.

Which of the following can be used as a rotating amplifier in a control system?

1.Amplidyne

2.Separately excited dc generator

3.Synchro

4.Self excited dc generator

Select the answer from the following codes:

Answer: B

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29.

If the poles lie in second quadrant, damping ratio is

Answer: B

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Answer: D

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