If it is desired to approximate the efficiency of an induction motor operating at slip ‘s’, then its efficiency is given by?(a) 1-s/1+s(b) 1/1+s(c) s/s+1(d) s/1-sI have been asked this question in homework.My question is from Equivalent Circuit in section Induction Machines of Electrical Machines

If it is desired to approximate the efficiency of an induction motor o

1.	If it is desired to approximate the efficiency of an induction motor operating at slip ‘s’, then its efficiency is given by?(a) 1-s/1+s(b) 1/1+s(c) s/s+1(d) s/1-sI have been asked this question in homework.My question is from Equivalent Circuit in section Induction Machines of Electrical Machines
Answer» RIGHT choice is (a) 1-s/1+s The best I can EXPLAIN: APPROXIMATELY EFFICIENCY is given as 1-s/1+s for an IM.

Discussion

No Comment Found

Related InterviewSolutions

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
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
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
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
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
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 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
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
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
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

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment