Control Systems Questions and Answers – Observer Systems

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

1. A control system in which the control action is somehow dependent on the output is known as
a) Closed loop system
b) Semi closed loop system
c) Open system
d) Non feedback control system
View Answer

Answer: a
Explanation: Closed system is a control system in which the feedback is present that can be positive or negative and in which the control action is somewhat dependent on the output.

2. In closed loop control system, with positive value of feedback gain the overall gain of the system will
a) Decrease
b) Increase
c) Be unaffected
d) Exponentially increase
View Answer

Answer: b
Explanation: Closed loop control system, can be both positive and negative and with positive value of feedback gain where the overall gain of the system will increase and also the oscillations.

3. Which of the following is an open loop control system?
a) Field controlled D.C. motor
b) Ward Leonard control
c) Metadyne
d) Stroboscope
View Answer

Answer: a
Explanation: Open loop control systems are the systems which have no feedback and cannot be used to obtain the desired response and field controlled system is an open loop control system.
advertisement
advertisement

4. Which of the following statements is not necessarily correct for open control system?
a) Input command is the sole factor responsible for providing the control action
b) Presence of non-linearities causes malfunctioning
c) Less expensive
d) Generally free from problems of non-linearities
View Answer

Answer: b
Explanation: Open loop control system are the systems which have no feedback and cannot be used to obtain the desired response and non-linearities does not cause malfunctioning.

5. In open loop system
a) The control action depends on the size of the system
b) The control action depends on system variables
c) The control action depends on the input signal
d) The control action is independent of the output
View Answer

Answer: d
Explanation: In open loop system the output cannot be used to obtain the desired response and the control action is independent of the output.
Sanfoundry Certification Contest of the Month is Live. 100+ Subjects. Participate Now!

6. ___________has tendency to oscillate.
a) Open loop system
b) Closed loop system
c) Open and closed loop systems have tendency to oscillate
d) No Systems have tendency to oscillate
View Answer

Answer: a
Explanation: Open loop control systems are the systems where the output cannot be the desired output and no feedback is used and gain of the system is very high due to this damping is very less and hence system has tendency to oscillate.

7. A good control system has all the following features except
a) Good stability
b) Slow response
c) Good accuracy
d) Sufficient power handling capacity
View Answer

Answer: b
Explanation: A good control system is mainly negative feedback closed loop control system where the gain of system is not very high and damping is present and no oscillations are present and has fast output response.
advertisement

8. A car is running at a constant speed of 50 km/h, which of the following is the feedback element for the driver?
a) Clutch
b) Eyes
c) Needle of the speedometer
d) Steering wheel
View Answer

Answer: c
Explanation: For car as control system steering wheel is the feedback element for the driver as for driver to maintain constant speed or desired speed steering wheel is the important element and error detector.

9. The initial response when the output is not equal to input is called
a) Transient response
b) Error response
c) Dynamic response
d) All of the mentioned
View Answer

Answer: a
Explanation: Transient response in the response at any time instant other than final response and this response is at any instant which is mainly dependent on the maximum peak overshoot and settling time.
advertisement

10. A control system working under unknown random actions is called
a) Computer control system
b) Digital data system
c) Stochastic control system
d) Adaptive control system
View Answer

Answer: c
Explanation: A control system is the system which is having feedback and can be both positive and negative and working under unknown random actions is called stochastic control system.

Sanfoundry Global Education & Learning Series – Control Systems.
To practice all areas of Control Systems, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.