163 + Interview Questions in Induction Machines in Electrical Machines Page 1 InterviewSolution

1.	In the following circle diagram, what is CC’?(a) full load condition(b) no load condition(c) fixed losses(d) rated full load lossesThe question was asked in an online quiz.This intriguing question originated from Circle Diagrams of Induction Machines in division Induction Machines of Electrical Machines
Answer» CORRECT OPTION is (a) FULL LOAD CONDITION Explanation: It is full load condition.

Discussion

2.	No load power factor of the induction motor will __________ if the no load test is conducted at its rated frequency but less than the rated voltage.(a) improve(b) degrade(c) remain same(d) none of the mentionedI had been asked this question during an interview for a job.My enquiry is from Circle Diagrams of Induction Machines in portion Induction Machines of Electrical Machines
Answer» CORRECT OPTION is (a) IMPROVE The BEST I can EXPLAIN: It will improve.

Discussion

3.	Use the below circle diagram to choose the correct option.(a) CF: Rotor copper loss, FG: Stator copper loss, GE: Fixed losses.(b) FG:Rotor copper loss, CF: Stator copper loss, GE: Fixed losses.(c) GE:Rotor copper loss, FG: Stator copper loss, CF: Fixed losses.(d) FG:Rotor copper loss, CF: Stator copper loss, CF: Core losses.This question was posed to me in a job interview.My doubt is from Circle Diagrams of Induction Machines topic in division Induction Machines of Electrical Machines
Answer» The correct CHOICE is (a) CF: Rotor COPPER loss, FG: Stator copper loss, GE: Fixed losses. To explain: GE is fixed losses. From the F to top the rated rotor copper losses OCCUR.

Discussion

4.	If the no load test is conducted at its rated frequency but less than the rated voltage, then the mechanical losses will _____ and the constant losses will _________(a) constant, reduce(b) constant, rise(c) reduce, rise(d) constant, constantI had been asked this question in my homework.I'm obligated to ask this question of Circle Diagrams of Induction Machines in chapter Induction Machines of Electrical Machines
Answer» The correct choice is (a) CONSTANT, reduce For EXPLANATION: MECHANICAL losses REMAIN always constant, but the stator losses will reduce as the voltage has been decreased.

Discussion

5.	If the no load test is conducted at its rated frequency but less than the rated voltage, then the wattmeter reading will be ____________(a) reduced(b) more than previous reading(c) remain same(d) none of the mentionedI got this question by my college director while I was bunking the class.I want to ask this question from Circle Diagrams of Induction Machines topic in portion Induction Machines of Electrical Machines
Answer» RIGHT choice is (a) reduced Explanation: No LOAD losses will reduce, so the power CONSUMPTION.

Discussion

6.	Stator resistance can be measured using Kelvin’s double bridge.(a) True(b) FalseThis question was addressed to me by my college director while I was bunking the class.This question is from Circle Diagrams of Induction Machines topic in division Induction Machines of Electrical Machines
Answer» Right OPTION is (a) True For explanation: Stator has very low RESISTANCE, so it is most ACCURATELY observed by using a kelvin’s DOUBLE bridge.

Discussion

7.	In the following circle diagram of the induction motor, QN is the ____________(a) rotor current referred to stator(b) stator current(c) stator current referred to rotor(d) no load input to rotorThe question was posed to me during a job interview.Enquiry is from Circle Diagrams of Induction Machines in section Induction Machines of Electrical Machines
Answer» Right ANSWER is (a) ROTOR CURRENT REFERRED to stator Easiest EXPLANATION: It is rotor current referred to stator.

Discussion

8.	In the below circle diagram, OG represents?(a) Rated torque(b) Maximum torque(c) Rated power output(d) LossesI got this question in my homework.Asked question is from Circle Diagrams of Induction Machines in chapter Induction Machines of Electrical Machines
Answer» CORRECT OPTION is (a) RATED TORQUE Easiest EXPLANATION: OG is the rated torque.

Discussion

9.	A 10kW, 50 Hz, 3-phase induction motor develops the rated torque at 1440rpm. If the load torque is reduced to half, then the power output that can now be obtained is?(a) 5 kW(b) 5.3 KW(c) 4.6 kW(d) 8 kWI have been asked this question by my school teacher while I was bunking the class.I want to ask this question from Circle Diagrams of Induction Machines in portion Induction Machines of Electrical Machines
Answer» RIGHT option is (a) 5 kW To EXPLAIN I WOULD SAY: S2 = (1/2)0.04 = 0.02 P = (100006023.141470)/(223.141460*60) P = 5.03 kW.

Discussion

10.	Blocked rotor test is conducted to find the ____________(a) leakage impedance(b) leakage reactance(c) stator impedance(d) rotor impedanceI have been asked this question in quiz.The query is from Circle Diagrams of Induction Machines in portion Induction Machines of Electrical Machines
Answer» Correct option is (a) leakage impedance Easy explanation: Blocked ROTOR TEST DETERMINES the leakage impedance and so the CORE LOSSES.

Discussion

11.	A 10kW, 50 Hz, 3-phase induction motor develops the rated torque at 1440rpm. If the load torque is reduced to half, then the motor speed is?(a) 1470rpm(b) 1410rpm(c) 1400rpm(d) 1444rpmI got this question in a national level competition.My doubt is from Circle Diagrams of Induction Machines in section Induction Machines of Electrical Machines
Answer»

Discussion

12.	Circle diagram depicts the relation between ____________(a) stator current and the slip variation(b) rotor current and stator current(c) slip variation and the power factor(d) slip variation and the losses of the machineI have been asked this question at a job interview.I'm obligated to ask this question of Circle Diagrams of Induction Machines topic in division Induction Machines of Electrical Machines
Answer» Right OPTION is (a) stator current and the SLIP VARIATION Best explanation: Circle DIAGRAM shows extermeties of stator current and the slip variation.

Discussion

13.	Circle diagram of an induction motor is graphical representation of ____________(a) its equivalent circuit(b) its rotor equivalent(c) its stator equivalent(d) its stationary equivalent circuitThe question was asked by my college director while I was bunking the class.Question is from Circle Diagrams of Induction Machines in division Induction Machines of Electrical Machines
Answer» The CORRECT choice is (a) its equivalent circuit For EXPLANATION I would say: Circle diagram GIVES INFORMATION about the equivalent circuit of the induction MOTOR.

Discussion

14.	No load test has been conducted on an induction motor for different supply voltages and input power vs voltage plot has been drawn. The curve is extrapolated to intersect the y-axis. This point is?(a) friction and windage losses(b) core losses(c) stray losses(d) all of the mentionedI have been asked this question in a national level competition.The doubt is from Applications of Polyphase Induction Motors in section Induction Machines of Electrical Machines
Answer» RIGHT OPTION is (a) friction and windage losses To EXPLAIN I WOULD say: The extrapolated point is friction and windage losses of the induction machine.

Discussion

15.	A 3-phase induction motor taking a line current of 200 A, is started by direct switching. If an auto transformer of with 50% tapping is made to be used, the motor line current and supply line current will be respectively?(a) 100, 50(b) 50, 100(c) 50, 200(d) 50*1.73, 200I have been asked this question in an interview for job.My doubt stems from Applications of Polyphase Induction Motors in section Induction Machines of Electrical Machines
Answer» CORRECT answer is (a) 100, 50 Explanation: The motor LINE CURRENT will reduce by a FOLD of four times and the line current by half.

Discussion

16.	When the poles of a 3-phase wound rotor induction motor increased, it _________(a) will decrease maximum power factor(b) will increase maximum power factor(c) will make no change in power factor(d) can not be depictedI got this question in an interview for job.The question is from Applications of Polyphase Induction Motors in chapter Induction Machines of Electrical Machines
Answer» The correct choice is (b) will INCREASE maximum power factor The best I can explain: If number of poles INCREASES, SPEED decreases, slip increases, REACTANCE decreases, power factor angle decreases and so the power factor increases.

Discussion

17.	Reducing the poles of a 3-phase induction motor, it _________(a) will decrease maximum power factor(b) will increase maximum power factor(c) will make no change in power factor(d) can not be depictedI have been asked this question in a job interview.I'm obligated to ask this question of Applications of Polyphase Induction Motors in chapter Induction Machines of Electrical Machines
Answer» The correct option is (a) will DECREASE maximum POWER factor Easiest explanation: If number of POLES reduces, speed increases, SLIP decreases, reactance increases, power factor ANGLE increases and so the power factor decreases.

Discussion

18.	The torque in an induction motor varies as ______ and in synchronous motor as _________(a) square of voltage, proportion to voltage(b) proportion to voltage, proportion to voltage(c) proportion to voltage, square of voltage(d) square of voltage, square of voltageThe question was asked in a job interview.My doubt is from Applications of Polyphase Induction Motors in chapter Induction Machines of Electrical Machines
Answer»

Discussion

19.	Which of the following can be done using a synchronous motor but not by induction motor?(a) Power factor improvement(b) Supplying mechanical load(c) Power factor improvement and supply mechanical load(d) None of the mentionedThis question was posed to me by my college director while I was bunking the class.My doubt stems from Applications of Polyphase Induction Motors in section Induction Machines of Electrical Machines
Answer» Right choice is (a) Power FACTOR improvement Best explanation: Induction motor is a singly EXCITED MACHINE and it always needs EXCITING current to SET up the flux in the machine.

Discussion

20.	We can not operate a cage induction motor on a variable frequency load due to ___________(a) no availability of varying the speed(b) availability of variable speed(c) low starting torque(d) fixed slipThis question was posed to me in an interview for job.Enquiry is from Applications of Polyphase Induction Motors topic in portion Induction Machines of Electrical Machines
Answer» RIGHT option is (a) no AVAILABILITY of varying the speed For explanation: We can not increase or decrease the rotor RESISTANCE of a cage induction motor, hence it is not SUITABLE for a variable FREQUENCY.

Discussion

21.	Speed control is possible for _______ and not possible for __________(a) induction motor, synchronous motor(b) induction motor, differential motor(c) synchronous motor, synchronous-induction motor(d) dc motor, induction motorI have been asked this question in an online interview.I would like to ask this question from Applications of Polyphase Induction Motors in section Induction Machines of Electrical Machines
Answer» The correct option is (a) induction motor, synchronous motor The BEST explanation: SPEED can be ADJUSTED for a induction motor while it can not be ALTERED for a synchronous motor operating at normal speed.

Discussion

22.	Relatively a squirrel-cage induction motor is advantageous over wound rotor type induction motor of identical rating due to ___________(a) less conductor material used(b) larger leakage flux(c) large starting torque(d) all of the mentionedThis question was addressed to me by my college director while I was bunking the class.My question is taken from Applications of Polyphase Induction Motors topic in chapter Induction Machines of Electrical Machines
Answer» Correct option is (a) less CONDUCTOR material used To elaborate: Squirrel CAGE induction MOTOR has lesser starting torque.

Discussion

23.	Two three phase squirrel-cage induction generator are identical in all respects except the fact that the slot depths in machine B is more than that of A. Machine B as compared to machine A, will have _________(a) less pull out torque but better power factor(b) more pull out torque but poor power factor(c) less pull out torque and poor power factor(d) more pull out torque and better power factorThis question was posed to me during an online exam.This is a very interesting question from Induction Generator topic in section Induction Machines of Electrical Machines
Answer» Right OPTION is (a) less pull out torque but BETTER POWER factor Easiest explanation: As the slot depth in MACHINE B is more than that of A, B will have higher reactance as the LEAKAGE flux will be lesser.

Discussion

24.	A 3-phase induction motor has full load efficiency of 0.7 and a maximum efficiency of 0.85. It is operated at a slip of 0.6 by reduced voltage method. The efficiency of the motor at this operating point is?(a) less than 0.35(b) greater than 0.35(c) in the range of 0.8 to 0.2(d) none of the mentionedThe question was posed to me in quiz.This interesting question is from Induction Generator in chapter Induction Machines of Electrical Machines
Answer» Right answer is (a) less than 0.35 The BEST EXPLANATION: For the SLIP more than 40%, the EFFICIENCY reduces more than 50% for an induction MOTOR.

Discussion

25.	Wound rotor induction motor is most appropriate for the applications requiring ______________(a) high starting torque(b) variable starting torque(c) fixed starting torque(d) all of the mentionedThe question was asked in homework.I'm obligated to ask this question of Applications of Polyphase Induction Motors topic in portion Induction Machines of Electrical Machines
Answer» The correct option is (B) variable starting TORQUE To explain I WOULD say: A wound rotor INDUCTION motor can have variable starting torque.

Discussion

26.	Induction generator is self excited machine.(a) True(b) FalseThe question was asked during an online exam.My question is taken from Induction Generator topic in section Induction Machines of Electrical Machines
Answer» The correct ANSWER is (b) False The explanation is: No, induction machine is first run as motor and then as generator. So it NEEDS the current to SET up the flux continuously.

Discussion

27.	Which is the most acceptable application field where an induction generator can be used?(a) wind power system(b) steam power system(c) hydro power system(d) nuclear power stationThis question was posed to me in semester exam.My enquiry is from Induction Generator topic in chapter Induction Machines of Electrical Machines
Answer» Correct CHOICE is (a) wind power system Explanation: Induction generator is widely acceptable in LOW speed and low power OPERATION LIKE wind power systems.

Discussion

28.	Induction generator can only work at leading reactive power.(a) True(b) FalseI had been asked this question in class test.My question is based upon Induction Generator topic in division Induction Machines of Electrical Machines
Answer»

Discussion

29.	What is/are the shortcomings of an induction generator in real time system?(a) It needs considerable amount of reactive power(b) Efficiency is poor(c) It can work at leading power factor only(d) All of the mentionedI got this question by my college professor while I was bunking the class.This is a very interesting question from Induction Generator topic in division Induction Machines of Electrical Machines
Answer» The CORRECT ANSWER is (d) All of the mentioned To explain I WOULD say: All are the disadvantages of an INDUCTION GENERATOR.

Discussion

30.	The magnetization curve in the induction generator working in isolation has similar characteristic as ____________(a) dc shunt generator(b) dc cumulative field generator(c) synchronous generator(d) all of the mentionedThe question was posed to me in examination.The query is from Induction Generator topic in division Induction Machines of Electrical Machines
Answer» Right option is (a) dc SHUNT generator For explanation: The voltage build up PROCESS of the INDUCTION generator is similar to that of the dc shunt generator.

Discussion

31.	If the residual flux is absent in the rotor iron of the isolated induction generator ____________(a) it will not run(b) it will run as induction motor(c) it will burn the winding(d) it will not affect the characteristic of the generatorI got this question by my school teacher while I was bunking the class.The origin of the question is Induction Generator in chapter Induction Machines of Electrical Machines
Answer»

Discussion

32.	For an induction motor to work in isolation, it should have ____________(a) lagging reactive power source(b) leading reactive power source(c) leading reactive power sink(d) any of the mentionedThe question was posed to me in unit test.My question is taken from Induction Generator topic in division Induction Machines of Electrical Machines
Answer» The correct OPTION is (a) lagging REACTIVE power SOURCE Easiest explanation: It MUST be connected to capacitors which can be the source for lagging reactive power.

Discussion

33.	A self excited induction generator ____________(a) must have static capacitor bank(b) can have static capacitor bank(c) should have static capacitor bank(d) any of the mentionedThis question was posed to me during an interview.I need to ask this question from Induction Generator in portion Induction Machines of Electrical Machines
Answer» The correct ANSWER is (a) MUST have static CAPACITOR bank Explanation: To provide the lagging REACTIVE POWER, it is must that it should be have a source of lagging reactive power.

Discussion

34.	Induction generator ____________(a) can not work in isolation(b) can work in isolation(c) should work in parallel with synchronous generators(d) any of the mentionedThe question was posed to me in quiz.Enquiry is from Induction Generator topic in division Induction Machines of Electrical Machines
Answer» The correct choice is (C) should WORK in parallel with synchronous generators The explanation: INDUCTION GENERATOR NEEDS the continuous flux and it can be either provided by the bus or the synchronous generator.

Discussion

35.	A 3-phase induction motor can also be run as ______________(a) synchronous generator(b) induction generator(c) dc shunt motor(d) any of the mentionedI have been asked this question by my college director while I was bunking the class.I'm obligated to ask this question of Induction Generator topic in chapter Induction Machines of Electrical Machines
Answer»

Discussion

36.	If the induction motor connected to a power grid draws real power P and reactive power Q. If it is made to run as a generator, then P and Q will be?(a) negative, positive(b) positive, positive(c) positive, negative(d) negative, negativeThe question was asked in examination.The doubt is from Power Factor Control of Three Phase Induction Motors in division Induction Machines of Electrical Machines
Answer» The CORRECT choice is (a) NEGATIVE, positive To EXPLAIN: INDUCTION motor will always NEED reactive power as it is single excited machine.

Discussion

37.	As per the condition given, if a 3-phase squirrel-cage induction motor is operating at a slip of -0.05 then machine will?(a) draw mechanical strength and deliver electrical power to mains(b) draw electrical power from mains and deliver mechanical strength to shaft(c) draw electrical power from shaft and deliver mechanical strength through mains(d) any of the mentionedI had been asked this question in my homework.The doubt is from Power Factor Control of Three Phase Induction Motors topic in division Induction Machines of Electrical Machines
Answer» The correct choice is (a) draw mechanical STRENGTH and deliver ELECTRICAL POWER to mains The best explanation: It is in generating mode as the SLIP is negative.

Discussion

38.	A 3-phase, 400 V, 50 Hz delta connected induction motor has power factor of 0.35 when delivering 30% of its load. If it is star connected, then its?(a) p.f. increased and the stator current decreases(b) p.f. worsened and the stator current decreases(c) p.f. increased,and the stator current increases(d) p.f. does not change,and the stator current increaseI have been asked this question in homework.My enquiry is from Power Factor Control of Three Phase Induction Motors in chapter Induction Machines of Electrical Machines
Answer» Right ANSWER is (a) p.f. increased and the stator current decreases The BEST EXPLANATION: In STAR connection, resistance decrease than delta CONNECTED.

Discussion

39.	A 3-phase induction machine is operating on 3-phase fixed frequency ac mains at a per unit slip of 1.5. Then machine is operating in generating mode.(a) True(b) FalseThe question was asked in exam.The above asked question is from Power Factor Control of Three Phase Induction Motors in section Induction Machines of Electrical Machines
Answer» CORRECT OPTION is (B) False Explanation: It is BRAKING MODE.

Discussion

40.	Static capacitors are used to control power factor of slip ring induction motor only.(a) True(b) FalseThe question was asked in an online interview.I would like to ask this question from Power Factor Control of Three Phase Induction Motors topic in chapter Induction Machines of Electrical Machines
Answer» The CORRECT CHOICE is (b) False To EXPLAIN: Static CAPACITORS are also used to improve power FACTOR of the slip ring as well as wound rotor induction motors.

Discussion

41.	In double cage induction motor, inner cage has ___________(a) small resistance and large reactance(b) high resistance and high reactance(c) small resistance and small reactance(d) high resistance and small reactanceThis question was addressed to me in an interview for internship.The query is from Power Factor Control of Three Phase Induction Motors topic in division Induction Machines of Electrical Machines
Answer» CORRECT answer is (a) small RESISTANCE and large reactance Explanation: In the bottom cage, the AIR gap is less, so the LEAKAGE reluctance is less and more the leakage reactance.

Discussion

42.	Induction motor can be fed from ___________(a) either rotor or stator(b) stator(c) rotor(d) neither stator nor rotorI got this question during an online interview.The query is from Power Factor Control of Three Phase Induction Motors topic in section Induction Machines of Electrical Machines
Answer» Correct OPTION is (a) either ROTOR or stator The explanation is: It can be fed from either SIDE at one TIME.

Discussion

43.	Which of the following will not happen if one of the phases to the induction motor is not available?(a) Motor will start but operate at lower speed(b) It will hum but not start(c) It will continue to operate below 57.7% of rated load(d) External means are needed to make it run at rated speedThis question was addressed to me by my college director while I was bunking the class.Question is taken from Power Factor Control of Three Phase Induction Motors in portion Induction Machines of Electrical Machines
Answer» Correct CHOICE is (a) Motor will START but operate at LOWER speed To explain: Motor will not start if one of the PHASES is missing.

Discussion

44.	If one of the three phases of the induction motor fails due to fault. The motor will ___________(a) stop and do permanent damage if it was running overloaded(b) continue running but will draw more current if it was operating at rated load(c) will not be affect the operation if light loaded(d) any of the mentionedI have been asked this question in a job interview.I need to ask this question from Power Factor Control of Three Phase Induction Motors in division Induction Machines of Electrical Machines
Answer» RIGHT CHOICE is (d) any of the mentioned For explanation: All the possibilities can happen if one of the phase is REMOVED.

Discussion

45.	If an unbalanced supply is fed to an induction motor, it will cause excessive heating of ____________(a) rotor(b) stator(c) rotor shaft(d) all of the mentionedThe question was posed to me by my college director while I was bunking the class.I want to ask this question from Power Factor Control of Three Phase Induction Motors topic in section Induction Machines of Electrical Machines
Answer» RIGHT answer is (a) rotor To EXPLAIN I would say: Unbalanced SUPPLY will cause most heating of rotor winding than any other PART.

Discussion

46.	Choose the most appropriate option regarding the power factor control of the induction motor.(a) A: with capacitor(b) B: with capacitor(c) A: with capacitor, B: with capacitor(d) A: with no capacitor, B: with capacitorI had been asked this question in homework.Query is from Power Factor Control of Three Phase Induction Motors topic in division Induction Machines of Electrical Machines
Answer» RIGHT answer is (a) A: with capacitor For explanation I WOULD say: Leading stator current SHIFTS to the LEFT.

Discussion

47.	Number of the slip rings required for the satisfied operation of an induction motor is?(a) number of phases(b) number of poles(c) halve of number of poles(d) double the phasesThis question was posed to me during an interview.I would like to ask this question from Determination of Equivalent Circuit Parameters in portion Induction Machines of Electrical Machines
Answer» Correct CHOICE is (a) number of phases To elaborate: SLIP RINGS number is same as the phase of the SUPPLY.

Discussion

48.	If the squirrel-cage induction motor is replaced by a solid cylinder in an induction motor its slip will ____________(a) increase(b) decrease(c) be same(d) zeroThis question was addressed to me during an interview.I would like to ask this question from Determination of Equivalent Circuit Parameters in section Induction Machines of Electrical Machines
Answer» Correct OPTION is (a) INCREASE Best explanation: REACTANCE of the rotor will decrease as the leakage wil REDUCE, so the SLIP will increase.

Discussion

49.	The speed of the squirrel-cage induction motor can be changed by varying slip.(a) True(b) FalseI have been asked this question at a job interview.This key question is from Determination of Equivalent Circuit Parameters in chapter Induction Machines of Electrical Machines
Answer» CORRECT option is (b) False To elaborate: For squirrel-cage induction MOTOR, the rotor GET shorted and it can not be ALTERED.

Discussion

50.	The speed characteristic of the induction motor is analogous to ____________(a) dc shunt motor(b) synchronous motor(c) cumulative compound motor(d) stepper motorThis question was addressed to me in an online interview.My question is taken from Determination of Equivalent Circuit Parameters topic in division Induction Machines of Electrical Machines
Answer» The CORRECT choice is (a) dc SHUNT motor To ELABORATE: As the speed PRACTICALLY remains constant and lesser than than the rated speed, it is similar to dc shunt motor.

Discussion

Explore topic-wise InterviewSolutions in .

Stator resistance can be measured using Kelvin’s double bridge.(a) True(b) FalseThis question was addressed to me by my college director while I was bunking the class.This question is from Circle Diagrams of Induction Machines topic in division Induction Machines of Electrical Machines

In the below circle diagram, OG represents?(a) Rated torque(b) Maximum torque(c) Rated power output(d) LossesI got this question in my homework.Asked question is from Circle Diagrams of Induction Machines in chapter Induction Machines of Electrical Machines

Blocked rotor test is conducted to find the ____________(a) leakage impedance(b) leakage reactance(c) stator impedance(d) rotor impedanceI have been asked this question in quiz.The query is from Circle Diagrams of Induction Machines in portion Induction Machines of Electrical Machines

Induction generator is self excited machine.(a) True(b) FalseThe question was asked during an online exam.My question is taken from Induction Generator topic in section Induction Machines of Electrical Machines

Induction generator can only work at leading reactive power.(a) True(b) FalseI had been asked this question in class test.My question is based upon Induction Generator topic in division Induction Machines of Electrical Machines

Induction generator ____________(a) can not work in isolation(b) can work in isolation(c) should work in parallel with synchronous generators(d) any of the mentionedThe question was posed to me in quiz.Enquiry is from Induction Generator topic in division Induction Machines of Electrical Machines

Static capacitors are used to control power factor of slip ring induction motor only.(a) True(b) FalseThe question was asked in an online interview.I would like to ask this question from Power Factor Control of Three Phase Induction Motors topic in chapter Induction Machines of Electrical Machines

Induction motor can be fed from ___________(a) either rotor or stator(b) stator(c) rotor(d) neither stator nor rotorI got this question during an online interview.The query is from Power Factor Control of Three Phase Induction Motors topic in section Induction Machines of Electrical Machines

The speed of the squirrel-cage induction motor can be changed by varying slip.(a) True(b) FalseI have been asked this question at a job interview.This key question is from Determination of Equivalent Circuit Parameters in chapter Induction Machines of Electrical Machines