# Performance Indices MCQ’s

This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Performance Indices”.

1. The compensator Gc(s) =5(1+0.3s)/(1+0.1s) would provide a maximum phase shift of:
a) 20°
b) 45°
c) 30°
d) 60°

2. The industrial controller having the best steady-state accuracy is:
a) A derivative controller
b) An integral controller
c) A rate feedback controller
d) A proportional controller

3. If the performance index of a phase lead compensator is (s+a)/ (s+b) and that of a lag compensator is (s+p)/(s+q), then which one of the following sets of conditions must be satisfied?
a) a>b and p<q
b) a>b and p<q
c) a<b and p<q
d) a<b and p>q

4. Assertion (A): An on-off controller gives rise to self-sustained oscillation in output.
Reason (R): Location of a pair of poles on the imaginary axis gives to self-sustained oscillation is output.
a) Both A and R true and R is correct explanation of A
b) Both A and R are true but R is not correct explanation of A
c) A is true and R is False
d) A is False and R is True

5. Which one of the following compensation is required for improving the transient response of the system?
b) Phase lag compensation
c) Gain compensation
d) Both phase lag compensation and gain compensation

6. Hydraulic controller :
a) Flexible operation
b) High torque high speed operation
c) Fire and explosion proof operation
d) No leakage

7. Consider the following statement:
A proportional plus derivative controller
1. Has high sensitivity
2. Increases the stability of the system
3. Improves the steady state accuracy

Which of these statements are correct?
a) 1,2 and 3
b) 1 and 2
c) 2 and 3
d) 1 and 3

8. Pneumatic controller are :
a) Flexible operation
b) High torque high speed operation
c) Fire and explosion proof operation
d) No leakage

9. Electronic Controller :
a) Flexible operation
b) High torque high speed operation
c) Fire and explosion proof operation
d) No leakage

10. A plant controlled by a proportional controller. If a time delay element is introduced in the loop its :
a) Phase margin remains the same
b) Phase margin increases
c) Phase margin decreases
d) Gain margin increases