InterviewSolution

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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.

1.	The mechanism of control of body temperature is non feedback system?(a) True(b) FalseThis question was addressed to me during an online interview.My question is from Feedback and Non-feedback Systems in division Feedback Characteristics of Control Systems of Control Systems
Answer» Correct ANSWER is (b) False Easiest EXPLANATION: It is feedback system as the temperature of our body is regulated periodically and being WARM blooded we REGULATE our body temperature w.r.t. to the climate.

2.	Which of the following are the characteristics ofregenerative feedback:(a) Zero damping(b) Stable(c) Least sensitive to parameter variations(d) None of the mentionedI had been asked this question during an interview.My question comes from Linearizing Effect and Regenerative Feedback in chapter Feedback Characteristics of Control Systems of Control Systems
Answer» Correct OPTION is (a) Zero damping To explain: OUTPUT response is SLOW and SLUGGISH and TRANSIENT time is more due to the oscillations.

3.	Loop gain provided by the regenerative feedback makes the closed loop transfer function insensitive to G(s).(a) True(b) FalseThe question was asked in a national level competition.My question is from Linearizing Effect and Regenerative Feedback topic in chapter Feedback Characteristics of Control Systems of Control Systems
Answer» The correct choice is (a) True Best EXPLANATION: As if the positive feedback LOOP GAIN is nearly considered to be unity then transfer FUNCTION becomes insensitive to G(s).

4.	Regenerative feedback is also called as_________________(a) Negative feedback(b) Positive feedback(c) No feedback(d) Negative and Positive FeedbackThis question was addressed to me by my school principal while I was bunking the class.I'd like to ask this question from Linearizing Effect and Regenerative Feedback topic in portion Feedback Characteristics of Control Systems of Control Systems
Answer» CORRECT ANSWER is (B) Positive feedback The explanation is: As the name implies that is REGENERATES the oscillations hence by name it can be positive.

5.	Multiple signals as input can be used in which systems:(a) Feedback systems(b) Non feedback systems(c) Feedforward systems(d) None of the mentionedThis question was addressed to me in an interview.I'd like to ask this question from Feedback and Non-feedback Systems in portion Feedback Characteristics of Control Systems of Control Systems
Answer» The correct choice is (a) Feedback systems For explanation: As in feedback SYSTEM OUTPUT can be obtained for more than one input as output can be GENERATED for both the REFERENCE input and also for the disturbance input.

6.	Benefits of feedback:(a) Performance of system is greater.(b) Need for system much larger path gain and system instability.(c) Controlled variable accurately follows the desired value(d) Affected by parameter variationsI got this question in an interview.The origin of the question is Feedback and Non-feedback Systems topic in portion Feedback Characteristics of Control Systems of Control Systems
Answer» Correct answer is (d) Affected by parameter variations The best explanation: Closed LOOP system is the system with the FEEDBACK and this can be POSITIVE or negative feedback andhaving feedback have LESS dependence on parameter VARIATION.

7.	Regenerative feedback implies feedback with(a) Oscillations(b) Step input(c) Negative sign(d) Positive signI have been asked this question by my college director while I was bunking the class.My query is from Control of the Effects of Disturbance Signals by Use of Feedback in portion Feedback Characteristics of Control Systems of Control Systems
Answer» The CORRECT OPTION is (d) POSITIVE sign The EXPLANATION: Regenerative feedback that is the positive feedback implies feedback with Positive sign and for complementary root LOCUS is for the regenerative feedback.

8.	Effect of feedback on sensitivity is minimum in:(a) Open loop control system(b) Closed loop control system(c) None of the mentioned(d) Both of the mentionedThe question was posed to me in an online interview.My enquiry is from Feedback and Non-feedback Systems topic in portion Feedback Characteristics of Control Systems of Control Systems
Answer» The correct option is (b) Closed loop CONTROL system To elaborate: Sensitivity is defined as the change in output with respect to change in parameter or input and for a GOOD control system the sensitivity MUST be less and in closed loop control system it gets REDUCED by the FACTOR of 1/(1+GH).

9.	Feedback can always reduce the effects of noise and disturbance on system performance?(a) True(b) FalseI have been asked this question by my school teacher while I was bunking the class.My question is based upon Feedback and Non-feedback Systems in section Feedback Characteristics of Control Systems of Control Systems
Answer» Right ANSWER is (a) True To ELABORATE: Feedback has many advantages as it can reduces the effects of NOISE and disturbance on system performance by increasing speed of RESPONSE.

10.	Assertion (A): Practical systems must be closed loop system.Reason (R): This is due to the fact that closed loop systems are least affected by parameter variations, stable, higher bandwidth, linear and more speed of response.(a) Both A and R are true and R is the correct explanation of A.(b) Both A and R are true but R is not the correct explanation of A.(c) A is true but R is false.(d) A is false but R is true.This question was addressed to me during an internship interview.I need to ask this question from Linearizing Effect and Regenerative Feedback in chapter Feedback Characteristics of Control Systems of Control Systems
Answer» The correct option is (a) Both A and R are true and R is the correct explanation of A. The explanation: PRACTICALLY systems USED must be LINEAR to avoid error, ease of calibration and also to get accurate RESULTS but the systems used are non-linear to avoid the error due to the linearity they are approximated.

11.	Transfer function of a system is used to calculate which of the following?(a) The order of the system(b) The time constant(c) The output for any given input(d) The steady state gainI had been asked this question at a job interview.I'm obligated to ask this question of Control of the Effects of Disturbance Signals by Use of Feedback topic in division Feedback Characteristics of Control Systems of Control Systems
Answer»

12.	The effect of adding feedback makes the system__________(a) Linear(b) Non-linear(c) Time variant(d) Time invariantThis question was posed to me in exam.Question is taken from Linearizing Effect and Regenerative Feedback topic in section Feedback Characteristics of Control Systems of Control Systems
Answer» Correct choice is (a) Linear Easy explanation: Consider the single loop system with FORWARD path TRANSFER function as the square function then the RESPONSE GENERATED is nonlinear if system is OPEN loop but will be approximately linear if closed loop.

13.	The relation between output response and input signal in closed loop system is :(a) Exponential(b) Parabolic(c) Linear(d) NonlinearI have been asked this question by my school teacher while I was bunking the class.Question is from Linearizing Effect and Regenerative Feedback in section Feedback Characteristics of Control Systems of Control Systems
Answer» The correct choice is (C) LINEAR To ELABORATE: Due to the linearizing effect of the FEEDBACK the relation between output response and the INPUT signal in closed loop system is linear.

14.	A control system with excessive noise, is likely to suffer from(a) Saturation in amplifying stages(b) Loss of gain(c) Vibrations(d) OscillationsI got this question during an internship interview.The origin of the question is Control of the Effects of Disturbance Signals by Use of Feedback in chapter Feedback Characteristics of Control Systems of Control Systems
Answer» Correct CHOICE is (a) SATURATION in amplifying stages Easiest explanation: Noise is defined as the unwnated output due to the input and this is due to the excessive BANDWIDTH and control SYSTEM with excessive noise is likely to suufer from saturation in amplifying stages.

15.	Which of the following are true:(a) Sensitivity of regenerative feedback is more than negative feedback but less than non-feedback system(b) Sensitivity of regenerative feedback is more non-feedback system but less than negative feedback system(c) Sensitivity of regenerative feedback is less than both(d) Sensitivity of regenerative feedback is more than bothI had been asked this question by my college director while I was bunking the class.I want to ask this question from Linearizing Effect and Regenerative Feedback topic in division Feedback Characteristics of Control Systems of Control Systems
Answer» Correct CHOICE is (C) Sensitivity of REGENERATIVE feedback is LESS than both The explanation is: Sensitivity of the positive feedback system is even more than non-feedback system and it is more by a FACTOR of 1/1-GH.

16.	Feedback control systems are:(a) Insensitive to both forward and feedback path parameter changes(b) Less sensitive to feedback path parameter changes than to forward path parameter changes(c) Less sensitive to forward path parameter changes that to feedback path parameter changes(d) Equally sensitive to forward feedback path parameter changesI had been asked this question in an internship interview.This intriguing question originated from Feedback and Non-feedback Systems topic in section Feedback Characteristics of Control Systems of Control Systems
Answer» CORRECT option is (c) Less sensitive to forward path parameter changes that to feedback path parameter changes The best explanation: Feedback control SYSTEM can be positive and negative but positive feedback SYSTEMS less WIDELY used as the positive feedback systems are more sensitive to parameter variations but negative feedback are less sensitive to change in G than change in H.

17.	Feedback always increases the gain?(a) True(b) FalseI got this question in homework.I'd like to ask this question from Feedback and Non-feedback Systems in chapter Feedback Characteristics of Control Systems of Control Systems
Answer» Right option is (B) False For explanation I would say: It cannot always increase gain it can also reduce the gain as gain of OPEN LOOP control system is more as COMPARED to it.

18.	Zero initial condition for a system means(a) Input reference signal is zero(b) Zero stored energy(c) Initial movement of moving parts(d) System is at rest and no energy is stored in any of its componentsThe question was asked in an international level competition.Question is taken from Control of the Effects of Disturbance Signals by Use of Feedback in division Feedback Characteristics of Control Systems of Control Systems
Answer» Right ANSWER is (d) SYSTEM is at rest and no energy is STORED in any of its components The EXPLANATION: Zero initial condition means that the system is at rest and no energy is stored in any of its component.

19.	The closed system has higher ________ than open loop control system, this implies increased speed of response.(a) Gain(b) Bandwidth(c) Frequency(d) SpeedThe question was posed to me by my college director while I was bunking the class.This intriguing question comes from Feedback and Non-feedback Systems topic in division Feedback Characteristics of Control Systems of Control Systems
Answer» Right answer is (b) Bandwidth The explanation: As transient RESPONSE of the system is IMPROVED by the use of feedback and it causes the settling time to reduce and closed loop system has higher bandwidth than OPEN loop systems and this implies increase in speed of response.