Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

51.	Proportional controller(a) Decreases steady state error and improves stability(b) Rise time decreases(c) Transient response becomes poorer(d) Increases steady state errorThis question was posed to me in an online interview.The query is from Cascade Compensation in Time Domain in division Design of Control Systems
Answer» CORRECT option is (d) Increases STEADY STATE error Explanation: PROPORTIONAL controller is the controller that is used in the system so that the output follows the input and increases steady state error.

52.	Feedback control system is basically(a) High pass filter(b) Low pass filter(c) Band pass filter(d) Band stop filterI have been asked this question in class test.Query is from Feedback Compensation in section Design of Control Systems
Answer» The correct option is (B) Low pass filter The EXPLANATION is: Low pass filter is mainly as integral controller and it is used as the controller in the system so as to increase the accuracy by reducing or proper ELIMINATING the STEADY state error of the control system.

53.	Lead compensator increases bandwidth(a) True(b) FalseI have been asked this question in homework.Enquiry is from Cascade Compensation in Time Domain topic in section Design of Control Systems
Answer» The CORRECT option is (a) True The explanation: Lead compensator is similar to high PASS filter and CAUSES lead in the system and increases the speed of RESPONSE of the system and HENCE increases Bandwidth.

54.	Operations performed by pneumatic controllers:(a) Flexible operations(b) High torque high speed operations(c) Fire and explosion proof operation(d) All of the mentionedThis question was posed to me by my college professor while I was bunking the class.My question is taken from Realization of Basic Compensators topic in division Design of Control Systems
Answer» The correct option is (c) Fire and explosion proof OPERATION The explanation: Pneumatic controllers are the controllers that perform the control ACTION to control the MOTION RELATED to AIR and they always perform fire and explosion proof operation.

55.	In time domain the measure of relative stability is:(a) Damping factor(b) Maximum peak overshoot(c) Damping factor and Maximum peak overshoot(d) Speed of responseThis question was addressed to me in unit test.My doubt stems from Preliminary Considerations of Classical Design in portion Design of Control Systems
Answer» The CORRECT answer is (C) DAMPING factor and Maximum peak overshoot For explanation I would say: Relative stability is the measure of stability of a particular control system with respect to some reference and is MEASURED both in time and frequency domain as in time domain it is the measure of damping factor and maximum peak overshoot.

56.	Lag compensation leads to:(a) Increases bandwidth(b) Attenuation(c) Increases damping factor(d) Second orderThe question was asked during an internship interview.This intriguing question comes from Tuning of PID Controllers in portion Design of Control Systems
Answer» Correct OPTION is (b) ATTENUATION To ELABORATE: Phase compensation can be lead, lag or lead lag compensation and integral compensation is also KNOWN as lag compensation and leads to attenuation which has least effect on the speed but the accuracy is increased.

57.	Phase lag controller:(a) Improvement in transient response(b) Reduction in steady state error(c) Reduction is settling time(d) Increase in damping constantI had been asked this question in examination.This is a very interesting question from Tuning of PID Controllers topic in chapter Design of Control Systems
Answer» The correct choice is (b) Reduction in STEADY state error To elaborate: PHASE lag CONTROLLER is the integral controller that creates the phase lag and does not affect the value of the damping factor and that TRIES to reduce the steady state error.

58.	PD controller is used to compensate system. Compared to the uncompensated system, the compensated system has:(a) A higher type number(b) Reduced damping(c) Higher noise amplification(d) Large transient overshootI got this question by my college director while I was bunking the class.I'm obligated to ask this question of Cascade Compensation in Frequency Domain in portion Design of Control Systems
Answer» The correct OPTION is (c) Higher noise amplification To explain I would say: Proportional Derivative CONTROLLER is used to increase the BANDWIDTH and also increases the signal to noise RATIO by REDUCING the noise and increasing the signal.

59.	Steady state error is usually specified in terms of :(a) Error constants(b) Damping factor(c) Speed of response(d) BandwidthThe question was posed to me in a national level competition.I'm obligated to ask this question of Preliminary Considerations of Classical Design in chapter Design of Control Systems
Answer» CORRECT OPTION is (a) Error constants To elaborate: STEADY state error is the error that is specified as the time approaches infinite and value approaches the final value and specified mainly in TERMS of error constants that are mainly POSITION, velocity and acceleration error constants.

60.	Controllers play the following role in control system:(a) They amplify the signals going to the actuator(b) They act on the error signal coming out of the summing junction and output a suitable to the actuator(c) They try to reduce steady state error optimizes overshoot.(d) All of the mentionedThis question was posed to me during an interview.I would like to ask this question from Cascade Compensation in Frequency Domain in chapter Design of Control Systems
Answer» Right CHOICE is (a) They amplify the signals GOING to the actuator The best I can explain: CONTROLLER amplify the signals going to the actuator and they are of many TYPES as proportional, integral, derivative some combinational controller as combination of TWO controllers and combination of all the controllers.

61.	In frequency domain the speed of response is measured in terms of:(a) Resonant frequency(b) Bandwidth(c) Resonant peak and bandwidth(d) Maximum peak overshootThis question was posed to me in an online interview.The origin of the question is Preliminary Considerations of Classical Design in section Design of Control Systems
Answer» Right OPTION is (C) Resonant peak and bandwidth To elaborate: The SPEED of RESPONSE is the time to get the final response and in frequency domain it depends UPON the resonant frequency the frequency at which the resonant peak is obtained and bandwidth.

62.	Into which energy signal does the position sensor convert the measured position of servomotor in servomechanisms?(a) Mechanical(b) Electrical(c) Thermal(d) LightI had been asked this question in quiz.Origin of the question is The Design Problem topic in division Design of Control Systems
Answer» The correct choice is (a) Mechanical To explain I would say: In mechanical system the sensors are used in which the mechanical MOTION is CONVERTED into electrical ENERGY and generally in mechanical system position SENSOR CONVERT the measured position of servomotor in servomechanism.

63.	In frequency domain the measure of relative stability is:(a) Resonant peak(b) Phase margin(c) Resonant peak and phase margin(d) Maximum peak overshootI had been asked this question in an online quiz.Origin of the question is Preliminary Considerations of Classical Design topic in portion Design of Control Systems
Answer» Correct option is (c) Resonant PEAK and phase margin Explanation: Relative stability is the measure of stability of a particular control system with respect to some reference and is MEASURED both in time and FREQUENCY domain as in frequency domain it is the measure of both resonant peak and phase margin.