Related InterviewSolutions

• If an emf at slip frequency is injected at an angle α with existing rotor induced emf, then the ___________(a) power factor only improves(b) speed changes(c) power factor improves and speed changes(d) power factor worsens and speed changesI have been asked this question at a job interview.This question is from Starting of Polyphase Induction Motors-II topic in portion Starting of Induction Motors of Electrical Machines
• If a 3-phase induction motor is fed from the rotor short circuiting the stator terminals, frequency of the current flowing in the short-circuited stator is?(a) slip frequency(b) supply frequency(c) zero(d) frequency corresponding to the rotor speedThis question was posed to me by my school teacher while I was bunking the class.My enquiry is from Starting of Polyphase Induction Motors-II topic in section Starting of Induction Motors of Electrical Machines
• A constant torque variable power drive of induction machine has ___________(a) constant air gap flux.(b) constant slip(c) variable air gap flux, constant slip(d) constant slip, constant air gap fluxThis question was addressed to me in examination.Question is taken from Starting of Polyphase Induction Motors-II topic in section Starting of Induction Motors of Electrical Machines
• Torque-slip characteristic of an induction motor is linear in the smaller slip values, because ___________(a) effective rotor resistance is very large compared to reactance(b) rotor resistance is equal to stator resistance(c) rotor resistance is equal to rotor reactance(d) rotor reactance almost equal to stator reactanceThis question was addressed to me in an interview for internship.My enquiry is from Starting of Polyphase Induction Motors-II topic in section Starting of Induction Motors of Electrical Machines
• For 3-phase induction motor, as load increases from no load towards the full load, torque _______ slip.(a) increases in proportion to(b) decreases in proportion to(c) remains constant to(d) increases hyperbolically toThe question was asked during an interview.My enquiry is from Starting of Polyphase Induction Motors-II topic in division Starting of Induction Motors of Electrical Machines
• For 3-phase induction motor, as load increases from no load towards the full load then the ___________(a) power factor improves(b) power factor remains same(c) power factor varies linearly(d) power factor increases till 40% load and then decreasesThe question was asked in homework.This intriguing question originated from Starting of Polyphase Induction Motors-II topic in portion Starting of Induction Motors of Electrical Machines
• Due to the line to ground fault, phase ‘a’ in the induction motor phase supply gets cut, then machine ___________(a) continues to run with excessive supply current(b) continues to run with reduced slip(c) stalls(d) all of the mentionedThis question was addressed to me during an online exam.I need to ask this question from Starting of Polyphase Induction Motors-II topic in section Starting of Induction Motors of Electrical Machines
• If one of the supply fuses blows off and gets open circuited, then for the connected induction machine continues to run with increased slip.(a) True(b) FalseI got this question in exam.I would like to ask this question from Starting of Polyphase Induction Motors-II topic in section Starting of Induction Motors of Electrical Machines
• Choose from the below which can be obtained by the equivalent circuit of an electrical machine?(a) Complete performance characteristics of the machine(b) Temperature coefficients of the machine components(c) Type of protection to be used in the machine(d) Design parameters of the windingsI had been asked this question in a job interview.Question is from Starting of Polyphase Induction Motors-II in section Starting of Induction Motors of Electrical Machines
• A 3-phase induction motor is fed at the stator at a frequency f. If the rotor speed is Nr and synchronous speed is Ns, then the absolute speed of the resultant flux in space is?(a) Ns(b) (Ns+Nr) if the flux rotates in the same same direction as the rotor(c) (Ns-Nr) if the flux rotates in the same same direction as the rotor(d) NrI had been asked this question by my college director while I was bunking the class.Enquiry is from Starting of Polyphase Induction Motors-II topic in chapter Starting of Induction Motors of Electrical Machines