In order to neutralize armature mmf perfectly under the pole shoe, the ampere-conductors of compensating winding must be (pole arc/pole pitch=1) _______(a) Not equal to the total armature ampere conductors under the pole shoe(b) Equal to the total armature ampere conductors under the pole shoe(c) Half of the total armature ampere conductors under the pole shoe(d) Twice of the total armature ampere conductors under the pole shoeI have been asked this question during a job interview.My question comes from Ways to Reduce Effects of Armature Reaction topic in portion Armature Reaction of DC Machines

In order to neutralize armature mmf perfectly under the pole shoe, the

1.	In order to neutralize armature mmf perfectly under the pole shoe, the ampere-conductors of compensating winding must be (pole arc/pole pitch=1) _______(a) Not equal to the total armature ampere conductors under the pole shoe(b) Equal to the total armature ampere conductors under the pole shoe(c) Half of the total armature ampere conductors under the pole shoe(d) Twice of the total armature ampere conductors under the pole shoeI have been asked this question during a job interview.My question comes from Ways to Reduce Effects of Armature Reaction topic in portion Armature Reaction of DC Machines
Answer» Correct answer is (b) EQUAL to the total armature ampere conductors under the pole shoe To explain: The number of ampere-turns required for compensating winding is ATcw /pole = ATA (peak) (pole arc/pole pitch) = [IaZ/(AP2)](pole arc/pole pitch). Here, pole arc= pole pitch, is given. Thus ampere-conductors required are equal to the total armature ampere conductors under the pole shoe.

Discussion

No Comment Found

Related InterviewSolutions

Only drawback of compensating winding is _______(a) Cost(b) Unavailability of material(c) Construction(d) Not a single drawbackThe question was asked in semester exam.This is a very interesting question from Ways to Reduce Effects of Armature Reaction in chapter Armature Reaction of DC Machines
If pole arc is less than pole pitch, a compensating winding will have ampere-turns _________ (compare to peak ampere turns).(a) Less(b) Equal(c) More(d) Can’t be specifiedI have been asked this question in a job interview.Question is from Ways to Reduce Effects of Armature Reaction topic in portion Armature Reaction of DC Machines
Cross-magnetizing effect of armature reaction can be reduced by __________(a) Removing saturation in teeth and pole-shoe(b) Making smooth pole shoes(c) Chamfering the pole shoes(d) Cannot be determinedI got this question in class test.I need to ask this question from Ways to Reduce Effects of Armature Reaction topic in chapter Armature Reaction of DC Machines
Compensating winding will provide incomplete neutralization ____________(a) Under pole region(b) In interpolar region(c) Everywhere(d) Complete neutralizationThis question was addressed to me in an international level competition.My question is from Ways to Reduce Effects of Armature Reaction topic in division Armature Reaction of DC Machines
Axis undergo shifting as a result of armature reaction, can be balanced by ______(a) Increase in armature current(b) Decrease in armature current(c) Introducing interpoles(d) Removing interpolesI have been asked this question at a job interview.My question is based upon Ways to Reduce Effects of Armature Reaction topic in chapter Armature Reaction of DC Machines
Each of the following statements regarding interpoles is true except______________________(a) They are small yoke-fixed poles spaced in between the main poles(b) They are connected in parallel with the armature so that they carry part of the armature current(c) Their polarity, in the case of generators is the same as that of the main pole ahead(d) They automatically neutralize not only reactance voltage but cross-magnetisation as wellThe question was asked by my college director while I was bunking the class.I need to ask this question from Ways to Reduce Effects of Armature Reaction topic in section Armature Reaction of DC Machines
The most likely cause(s) of sparking at the brushes in a DC machine is /are ____________(a) Open coil in the armature(b) Defective interpoles(c) Incorrect brush spring pressure(d) Open coil in armature, defective interpoles and incorrect brush spring pressureI had been asked this question during an online exam.This is a very interesting question from Ways to Reduce Effects of Armature Reaction in portion Armature Reaction of DC Machines
Exact purpose of compensating winding in a DC generator is _________(a) Mainly to reduce the eddy currents by providing local short-circuits(b) To provide path for the circulation of cooling air(c) To neutralise the cross-magnetising effect of the armature reaction(d) Cannot be determinedI have been asked this question in an internship interview.I would like to ask this question from Ways to Reduce Effects of Armature Reaction topic in portion Armature Reaction of DC Machines
What is the exact location of compensating winding?(a) Across armature(b) In series with armature(c) Across armature or in series(d) Cannot be determinedThe question was asked by my college professor while I was bunking the class.Question is from Ways to Reduce Effects of Armature Reaction topic in chapter Armature Reaction of DC Machines
Inequality in brush arm currents caused due to different emf induced in different parallel paths may give rise to copper losses. These effects can be avoided by using _________(a) Compensating windings(b) Interpoles(c) Equalizer rings(d) Cannot be determinedThis question was addressed to me during an interview for a job.My doubt stems from Ways to Reduce Effects of Armature Reaction in chapter Armature Reaction of DC Machines

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment