Why is the stator core built up of laminations?(a) to reduce core loss(b) to reduce copper loss(c) to reduce iron loss(d) to reduce eddy current lossI had been asked this question during an interview for a job.My doubt is from Construction of Hydro-Generators in portion Design of Synchronous Machines of Design of Electrical Machines

Why is the stator core built up of laminations?(a) to reduce core loss

1.	Why is the stator core built up of laminations?(a) to reduce core loss(b) to reduce copper loss(c) to reduce iron loss(d) to reduce eddy current lossI had been asked this question during an interview for a job.My doubt is from Construction of Hydro-Generators in portion Design of Synchronous Machines of Design of Electrical Machines
Answer» The correct answer is (d) to reduce eddy current LOSS Easiest EXPLANATION: The stator CORE is built up of laminations in ORDER to reduce the eddy current loss. The loss in the laminated core is usually the single largest loss and hence the choice of type and grade of steel is of utmost importance.

Discussion

No Comment Found

Related InterviewSolutions

What is the formula for the depth of armature core?(a) depth of armature core = flux / length of the iron core * flux density(b) depth of armature core = flux * length of the iron core * flux density(c) depth of armature core = flux / 2 * length of the iron core * flux density(d) depth of armature core = flux * 2 * length of the iron core * flux densityThe question was posed to me during an interview for a job.The origin of the question is Slot Dimensions in portion Design of Synchronous Machines of Design of Electrical Machines
What is the formula for the outer diameter of the stator?(a) outer diameter = inner diameter + depth of the slots + depth of armature core(b) outer diameter = inner diameter + 2*depth of the slots + depth of armature core(c) outer diameter = inner diameter + 2*(depth of the slots + depth of armature core)(d) outer diameter = inner diameter + depth of the slots + 2*depth of armature coreThe question was asked in semester exam.I want to ask this question from Slot Dimensions topic in portion Design of Synchronous Machines of Design of Electrical Machines
The flux density in the armature core of salient pole machines lies between 1-1.2 Wb per m^2.(a) true(b) falseThis question was posed to me in unit test.Question is taken from Slot Dimensions in section Design of Synchronous Machines of Design of Electrical Machines
What is the formula for the height of length of mean turn of armature?(a) length of mean turn = 2*length + 2.5*pole pitch + 0.06 kV + 0.2(b) length of mean turn = 2*length + 2*pole pitch + 0.06 kV + 0.2(c) length of mean turn = 2*length + 2.5*pole pitch – 0.06 kV – 0.2(d) length of mean turn = 2*length – 2.5*pole pitch – 0.06 kV – 0.2I had been asked this question in semester exam.This interesting question is from Slot Dimensions topic in division Design of Synchronous Machines of Design of Electrical Machines
By how much should the depth of slot not exceed the width?(a) two times(b) three times(c) four times(d) six timesThis question was addressed to me during an interview for a job.This is a very interesting question from Slot Dimensions in division Design of Synchronous Machines of Design of Electrical Machines
Why are slot made deeper in the machine?(a) to increase the short circuit current(b) to reduce the short circuit current(c) to increase the open circuit current(d) to reduce the open circuit currentThis question was posed to me by my college director while I was bunking the class.My question is based upon Slot Dimensions in portion Design of Synchronous Machines of Design of Electrical Machines
What is the formula for the maximum permissible width of slot?(a) maximum permissible width = slot pitch * minimum width of the teeth(b) maximum permissible width = slot pitch + minimum width of the teeth(c) maximum permissible width = slot pitch / minimum width of the teeth(d) maximum permissible width = slot pitch – minimum width of the teethI have been asked this question in an online interview.My question comes from Slot Dimensions topic in section Design of Synchronous Machines of Design of Electrical Machines
Name the slots that are commonly used.(a) parallel sided(b) square sided(c) rectangular(d) circularI have been asked this question by my school principal while I was bunking the class.Origin of the question is Slot Dimensions topic in division Design of Synchronous Machines of Design of Electrical Machines
How is the teeth and the minimum width designed in the machines?(a) teeth is tapered and minimum width is across the medium(b) teeth is sharpened and minimum width occurs across the air gap(c) teeth is widened and minimum width occurs across the air gap(d) teeth is reduced and minimum width occurs across the mediumThe question was posed to me in final exam.Question is from Slot Dimensions topic in chapter Design of Synchronous Machines of Design of Electrical Machines
What is the formula for the minimum width of the tooth?(a) minimum width of tooth = flux * pole proportion * (number of stator slots / number of poles) * length * 1.8(b) minimum width of tooth = flux / pole proportion * (number of stator slots / number of poles) * length * 1.8(c) minimum width of tooth = flux * pole proportion / (number of stator slots / number of poles) * length * 1.8(d) minimum width of tooth = flux * pole proportion * (number of stator slots / number of poles) * length / 1.8The question was posed to me in an interview.I need to ask this question from Slot Dimensions in chapter Design of Synchronous Machines of Design of Electrical Machines

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment