# Cascade Compensation in Frequency Domain MCQ’s

This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Cascade Compensation in Frequency Domain”.

1. PD controller is used to compensate system. Compared to the uncompensated system, the compensated system has:

a) A higher type number

b) Reduced damping

c) Higher noise amplification

d) Large transient overshoot

2. P+D controller:

a) Introduces offset

b) Increases bandwidth

c) Increases margin of stability

d) Reduces velocity constant

3. A phase lead compensation leads to:

a) Increase in overshoot

b) Reduction in bandwidth of closed loop system

c) Reduction in rise time of closed loop system

d) Reduction in gain margin

4. Proportional controller:

a) Introduces offset

b) Increases bandwidth

c) Increases margin of stability

d) Reduces velocity constant

5. Controllers play the following role in control system:

a) They amplify the signals going to the actuator

b) They act on the error signal coming out of the summing junction and output a suitable to the actuator

c) They try to reduce steady state error optimizes overshoot.

d) All of the mentioned

6. Response to error is very fast for integral controller.

a) True

b) False

7. The transfer function of a lead controller is 1+20s/1+5s. The high frequency magnitude of the lead controller to dB is ___________

a) 1

b) 2

c) 3

d) 4

8. The transfer function of the compensator is s+4/s+16. The maximum phase lead frequency and the corresponding phase is :

a) 6 rad/sec, 36.87°

b) 8 rad/sec, 36.87°

c) 6 rad/sec, -36.87°

d) 8 rad/sec, -36.87°

9. Consider the following statements:

1. Integral controller improves steady state response

2. By use of proportional controller, maximum peak overshoot decreases

3. Type and order of system reduces by one for derivative controller

4. Integral controller makes the system less stable in transient state due to oscillations

Select the correct answer using the codes given below:

a) 1,3 and 4

b) 1,2 and 3

c) 2.3 and 4

d) 1,2 and 4

10. Rate mode controller is also known as ______________ controller mode.

a) Anticpatory

b) Delay

c) Integral

d) Derivative