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Electronics and Communication Engineering - Automatic Control Systems

Exercise : Automatic Control Systems - Section 3
1.
Lag compensation increases bandwidth of the system.
True
False
Answer: Option
Explanation:

Lag compensation improves steady state behaviour.

2.

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
Answer: Option
Explanation:

System in A is overdamped.

3.
The polar plot of the given figure is for the term
(jω)2
1 + (jω)2
Answer: Option
Explanation:

For the term , magnitude is 0 at ω = ∞ and infinite at ω = 0. Moreover phase angle is -180°.

4.
For the unity feed back system of the given figure, the closed loop transfer function is
Answer: Option
Explanation:

.

5.
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
Answer: Option
Explanation:

Negative feedback increase bandwidth and reduces distortion.

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