Automatic Control Systems - ECE Questions and Answers

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Assertion (A): The time response of the system with will not have any overshoot for unit step input.

Reason (R): A critically damped system does not have any overshoot to a unit step input.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

R is correct but A is wrong

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The polar plot of the given figure is for the term

(jω)²

1 + (jω)²

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For the unity feed back system of the given figure, the closed loop transfer function is

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The effect of negative feedback on distortion and bandwidth because

both are decreased

both are increased

distortion is reduced and bandwidth is increased

distortion is increased and bandwidth is decreased

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Which of the following rotors are used in two phase ac servomotor?

Solid iron rotor
Squirrel cage rotor
Drag cup rotor

Of the above the correct ones are

1, 2, 3

1, 2

2, 3

1, 3

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For the system of given figure the closed loop transfer function

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Given figure shows a unity feedback system. The ratio of time constants for open loop and closed loop response are

1 : 1

2 : 1

3 : 2

2 : 3

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For a second order system damping factor is 0.1. If ω_d is frequency of damped oscillations and ω_n is natural frequency, then

ω_d ≈ ω_n

ω_n ≈ ω_n

ω_d ≈ (ω_n)²

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For the block diagram of in the given figure, the transfer function C(s)/R(s) is