Free Control Systems MCQs with Answers
72 Control Systems MCQs from Electrical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Root locus
- B. Bode plot
- C. Nyquist plot
- D. None of the above
Explanation: Root locus shows how the closed-loop poles move as gain changes, so it directly indicates stability and gives transient-response…
Correct answer: Root locus- A. no pole
- B. net pole
- C. simple pole
- D. two poles
- E. none of the above
Explanation: A type 0 system has no pole at the origin because its open-loop transfer function contains no integrator.
Correct answer: no pole- A. Frequency response
- B. Absolute stability
- C. Relative stability
- D. Time response
Explanation: Phase margin measures how close a system is to the condition of instability, so it indicates relative stability.
Correct answer: Relative stability- A. Nyquist Criterion
- B. Quasi linearization
- C. Functional analysis
- D. Phase-plane representation
Explanation: The Nyquist criterion is a frequency-domain stability method developed for linear systems.
Correct answer: Nyquist Criterion- A. Control valve
- B. Potentiometer
- C. Electropneumatic converter
- D. Servomotor
Explanation: A final control element applies the controller output to the process, as a valve, servomotor, or electropneumatic converter does.
Correct answer: Potentiometer- A. oscillatory
- B. critically damped
- C. overdamped
- D. underdamped
- E. none of the above
Explanation: For the usual second-order feedback system, increasing gain beyond the critical value reduces the damping ratio below one.
Correct answer: underdamped- A. Root locus
- B. Bode
- C. Nyquist
- D. Nichols
Explanation: The root-locus technique rapidly relates gain to closed-loop pole locations, allowing both stability and transient characteristics to be…
Correct answer: Root locus- A. system stability
- B. system gain
- C. system stability and gain
- D. none of the above
Explanation: Negative feedback reduces the overall closed-loop gain, approximately to the forward gain divided by one plus loop gain.
Correct answer: system gain- A. small bandwidth
- B. negative time constant
- C. large negative transfer function pole
- D. none of the above
Explanation: A well-designed first-order system has its pole on the negative real axis, and a pole farther to the left gives a faster response.
Correct answer: large negative transfer function pole- A. Bode-Nyquist stability methods
- B. Transfer functions
- C. Root locus design
- D. State model representatives
Explanation: State-space models use state equations that can include time-dependent coefficients, so they apply to time-varying systems.
Correct answer: State model representatives11. In pneumatic control systems the control valve used as final control element converts____________?
- A. pressure signal to electric signal
- B. pressure signal to position change
- C. electric signal to pressure signal
- D. position change to pressure signal
- E. none of the above
Explanation: In a pneumatic control system, the valve actuator receives a pneumatic pressure signal and converts it into mechanical stem or plug…
Correct answer: pressure signal to position change- A. is independent of frequency
- B. is inverseh'proportional to frequency
- C. increases linearly with frequency
- D. decreases linearly with frequency
Explanation: A transportation delay of T seconds has transfer function e^(-sT), whose phase is -ωT radians.
Correct answer: increases linearly with frequency- A. not necessarily stable
- B. stable
- C. unstable
- D. always unstable
- E. any of the above
Explanation: A bounded response to one step input does not by itself prove overall stability, because other inputs or unobserved system modes may still…
Correct answer: not necessarily stable- A. parabolic
- B. ramp
- C. impulse
- D. step
Explanation: A unit ramp input has a constant rate of change, so its steady-state tracking error is governed by the velocity error constant.
Correct answer: ramp- A. no net pole
- B. net pole
- C. simple pole
- D. two poles
Explanation: System type is the number of net poles at the origin in the open-loop transfer function.
Correct answer: two poles- A. acceleration
- B. velocity
- C. position
- D. all of the above
Explanation: Static error coefficients quantify steady-state performance for position, velocity, and acceleration inputs.
Correct answer: all of the above- A. capacitance
- B. reciprocal of capacitance
- C. current
- D. resistance
Explanation: In the force-voltage analogy, force corresponds to voltage and velocity to current.
Correct answer: reciprocal of capacitance- A. Laplace Transform and Fourier Integral
- B. Laplace Transform
- C. Fourier Integral
- D. Either B. or C.
Explanation: The Laplace transform provides the general time-domain to complex-frequency-domain relation, while the Fourier integral gives the direct…
Correct answer: Laplace Transform and Fourier Integral- A. no pole
- B. net pole
- C. simple pole
- D. two poles
Explanation: A type 1 system has one net pole at the origin. A single pole at the origin is called a simple pole.
Correct answer: simple pole- A. smaller damping ratio
- B. larger damping ratio
- C. constant damping ratio
- D. none of the above
Explanation: Increasing loop gain commonly moves the dominant closed-loop poles toward lower damping, producing more overshoot and oscillation.
Correct answer: smaller damping ratioControl Systems MCQs: common questions
Are these Control Systems MCQs free?
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How many Control Systems MCQs are on this page?
There are 72 Control Systems MCQs in the Electrical Engineering bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Control Systems MCQ have an explanation?
Yes. Each Control Systems question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
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