Electronics and Communication Engineering - Automatic Control Systems

1. 

Lag compensation increases bandwidth of the system.

A. True
B. False

Answer: Option B

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.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. R is correct but A is wrong

Answer: Option C

Explanation:

System in A is overdamped.


3. 

The polar plot of the given figure is for the term

A. (jω)2
B. 1 + (jω)2
C.
D.

Answer: Option C

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

A.
B.
C.
D.

Answer: Option A

Explanation:

.


5. 

The effect of negative feedback on distortion and bandwidth because

A. both are decreased
B. both are increased
C. distortion is reduced and bandwidth is increased
D. distortion is increased and bandwidth is decreased

Answer: Option C

Explanation:

Negative feedback increase bandwidth and reduces distortion.


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