Pid controller mcq answers
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This document contains 31 multiple choice questions related to control systems and controllers. The questions cover topics such as: - The relationship between steady-state error, gain, and oscillations for proportional controllers. - Design criteria for PID controllers including quarter-amplitude decay ratio and Zeigler-Nichols method. - Phenomena related to switching between manual and automatic modes. - Definitions of proportional band, proportional gain, reset control, and integral control. - Applications and effects of P, PI, PD, and PID controllers. - Characteristics and uses of proportional, integral, and derivative controllers. The document concludes by providing the solutions to each multiple choice question.
Pid controller mcq answers
- 1. Assistant Prof. Dr. Khalaf S Gaeid Electrical Engineering Department/Tikrit University khalafgaeid@tu.edu.iq gaeidkhalaf@gmail.com +9647703057076 April 2018
- 2. 1. What is the relationship between the steady-state error, gain and the tendency of oscillations when the controller is supposed to be under the proportional action? a) Steady-state error increases with an increase in gain and oscillation tendency b) Steady-state error decreases with the decrease in gain and oscillation tendency c) Steady-state error decreases with an increase in gain and oscillation tendency d) Steady-state error increases with the decrease in gain and oscillation tendency
- 3. 2. The quarter-amplitude decay ratio is basically a design criteria specified by Zeigler-Nichols method implies that the amplitude of an oscillation must be reduced by a factor of __________ a) four over a whole period b) four over an half period c) four over a quarter period d) four over a quarter and a half period
- 4. 3. Which phenomenon occurs due to coincidence of two output signals generated manually as well as by control algorithm at the time of switching in manual mode ? a) Bumped Data Transfer b) Bumpless Transfer c) Coincidence Data Transfer d) None of the above
- 5. 4. Proportional band of a controller is defined as the range of: a)Measured variable to the set variable b)Air output as the measured variable varies from maximum to minimum c) Measured variables through which the air output varies from maximum to minimum d) None of the above
- 6. 5. Proportional band of the controller is expressed as: a) Gain b) Ratio c) Percentage d) Range of control variables
- 7. 6. The term reset control refers to: a) Proportional b) Integral c) Derivative d) None of the above
- 8. 7. The integral control: a) Increases the steady state error b) Decreases the steady state error c) Increases the noise and stability d) Decreases the damping coefficient
- 9. 8. proportional gain for PID controller is more than the PI control. a) Leads to destabilizing effect b) Leads to stabilizing effect c) No action is taken d) All the above.
- 10. 9. For PI control use a lower proportional gain because the pressure of the integral control mode introduces additional _____ in all the frequencies. a)Phase lead b) Phase lag c) Both (a) & (c) d) None of the above
- 11. 10. The presence of the derivative control mode introduces ______ with strong ______ in the closed loop response. a) Phase lag and destabilizing effect b) Phase lead and stabilizing effect c) Phase lag and stabilizing effect d) Phase lead and destabilizing effect
- 12. 11. Ziegler Nichols method is also called as _______ a) Open loop transient response method b) Frequency response method c) Damped oscillation method d) Ultimate cycling method 12. For proportional control the steady state error (offset) tends to Zero when Kp is: a) Infinity b) Zero c) One d) 0.5
- 13. 13. Use of I-control along with P-control facilitates a) elimination of offset b) reduction of offset c) reduction of stability time d) none of these. 14.Reset rate is the another term used for __________ time. a) Dead b) Integral c) Derivative d) none of these 15. Proportional + integral is used to have _______ of the process a) Slow response b) Fast response c) Low peak overshoot d) Reduced oscillation
- 14. 16. Which type of controller increases the stability of the system by keeping it at a consistent setting? a) Derivative b) Proportional c) ON OFF controller d) Integral 17.PID controller is also known as a)two term controller b)three term controller c)four term controller d)proportional controller
- 15. 18-The control system design specification for a chemical process is described as short settling time, improved damping and zero steady state error. What control do we choose? a) P b) PI c) ID d) PID 19. Which of the following controllers has the least maximum deviation ? a) P-I controller b) P-D controller c) P-controller d) P-I-D controller
- 16. 20. Which of the following controllers has maximum offset ? a) P-controller b) P-I controller c) P-I-D controller d) P-D controller 21.Proportional (P) Controller is Used a)Load Changes are small b) Offset can be tolerated c) Permit a narrow proportional band d)Reduce the amount of the offset e) All above 22.Integral (I) Controller is Used: a) offset must be eliminated b) Integral saturation due to sustained deviation is not objectionable c) Reduce overshoot d) All above
- 17. 23. Proportional and Integral action is employed when a) System changes is small b) Offset must be eliminated c)No objection on the recovery duration d) All above 24. PD action is employed when a) When the system changes are small b) Improve the recovery time c)When system lags are high d) All above 25.PID controller is used when system requires a)System changes are small b)Offset must be eliminated c)Fast recovery time d) All above
- 18. 26.Proportional (P) Controller is Used(correct if its not) a)small change Rise time b)Decrease settling time c)Decrease overshoot d)No change in SSE e)None of the above(this is Derivative ) f)All the above 27.Derivative (D) Controller is Used(correct if its not) a)Decrease the rise time b)Increase the settling time c)Increase the overshoot d)Eliminate the SSE e)None of the above(this is integral) f)All the above
- 19. 28.Integral (I) Controller is Used(correct if its not) a)Decrease the rise time b)Small change in the settling time c)Increase the overshoot d)Decrease the SSE e)None of the above(this is proportional) f)All the above 29. Effect of PD which is (Phase Lead Compensation) are: a) Gain crossover frequency increases. b) Bandwidth decreases. c) Phase margin will be increase. d) Response will be slower before due to decreasing bandwidth, the rise time and the settling time become larger. e) None of the above
- 20. 30. Effect of Phase Lead Compensation(PD controller) a) The velocity constant Kv increases. b) The slope of the magnitude plot reduces at the gain crossover frequency so that relative stability improves and error decrease due to error is directly proportional to the slope. c) Phase margin increases. d) Response become faster. e) None of the above f)All the above 31. Addition of zeros in transfer function causes which of the following ? (a)Lead-compensation (b)Lag-compensation (c)Lead-lag compensation (d)None of the above
- 21. Solutions 1.c 2.a 3.b 4.c 5.c 6.b 7.b 8.b 9.b 10.b 11.d 12.a 13.a 14.b 15.a 16.b 17.b 18.d 19.b 20.a 21.e 22.d 23.d 24.d 25.d 26.e_(this is Derivative ) 27.e_(this is integral) 28.e_(this is proportional) 29.e 30.f 31.b
Editor's Notes
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- #6: Why is plagiarism such a big deal in the university context? Well without such policies the weight or value of a university degree would decrease. If we value degrees and place emphaisis on obtaining one than surely we have to maintain and up hold the process. University degrees are highly valued and are also an example of an ability to think critically, creatively and independently. Uni degrees have also been about a students ability to use their higher order thinking skills. This issue becomes particularly important if we see degrees as passports to professions. For those who don’t maintain academic integrity it means that they could be receiving undeserved recognition of their skills, they are not able to engage in higher level thinking and in some situations this could be dangerous.
- #23: Why is plagiarism such a big deal in the university context? Well without such policies the weight or value of a university degree would decrease. If we value degrees and place emphaisis on obtaining one than surely we have to maintain and up hold the process. University degrees are highly valued and are also an example of an ability to think critically, creatively and independently. Uni degrees have also been about a students ability to use their higher order thinking skills. This issue becomes particularly important if we see degrees as passports to professions. For those who don’t maintain academic integrity it means that they could be receiving undeserved recognition of their skills, they are not able to engage in higher level thinking and in some situations this could be dangerous.