Design Considerations for Higher-Order Systems MCQ’s

This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Design Considerations for Higher-Order Systems”.

1. How does cascading an integral controller in the forward path of a control system affect the relative stability (RS) and the steady-state error of that system?
a) RS and SSE are increased
b) RS is reduced nut SSE is increased
c) RS is increased but SSE is reduced
d) RS and SSE are reduced

2. With regard to the filtering property, the lead compensator and the lag compensator are respectively :
a) Low pass and high pass filters
b) High pass and low pass filters
c) Both high pass filter
d) Both low pass filters

3. Which one of the following statements is correct?
The effects of the phase lead compensator or gain cross over frequency and the bandwidth are:
a) That both are decreased
b) That gain cross over frequency reduces but BW is increased
c) That gain cross over frequency increases but BW is decreased
d) That both are increased

4. What is the effect of phase-lag compensation on the performance of the servo system?
a) For a given relative stability, the velocity constant is increased
b) For a given relative stability, the velocity constant is decreased
c) The bandwidth of the system is increased
d) The time response is made faster

5. Which one of the following is a disadvantage of proportional controller?
a) It is destabilizes the system
b) It produces offset
c) It makes the response faster
d) It has very simple implementation

6. Consider the following statements for a PI compensator for control system.
1. It is equivalent to adding a zero at origin
2. It reduces overshoot
3. It improves the steady state error of the system
Which of the statements given above are correct?
a) 1 and 3
b) 1,2 and 3 only
c) 2 and 3
d) 1 only

7. Which one of the following is an advantage of a PD controller in terms of damping and natural frequency?
a) G remains fixed but natural frequency increases
b) G remains fixed but natural frequency decreases
c) Natural frequency fixed but G increases
d) Natural frequency fixed but G decreases

8. A process is controlled by PID controller. The sensor has high, measurement noise. How can the effect be reduced?
a) By use of bandwidth limited derivative term
b) By use of proportional and derivative terms in the forward path
c) By use of high proportional band
d) By use of low integral gain

9. The input to a controller is :
a) Sensed signal
b) Error signal
c) Desired variable value
d) Signal of fixed amplitude not dependent on desired value

10. What is the characteristic of a good control system?
a) Sensitive to parameter variation
b) Insensitive to the input command
c) Neither sensitive to parameter variations not sensitive to input commands
d) Insensitive to the parameter variation but sensitive to the input commands

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