Why interpoles are tapered in a DC machine?(a) Simpler design(b) Reduction in the weight(c) Increase in acceleration of commutation(d) Cannot be determinedThis question was posed to me in an interview for internship.Question is taken from Commutation Process topic in portion Commutation Process & Excitation Methods of DC Machines

Why interpoles are tapered in a DC machine?(a) Simpler design(b) Reduc

1.	Why interpoles are tapered in a DC machine?(a) Simpler design(b) Reduction in the weight(c) Increase in acceleration of commutation(d) Cannot be determinedThis question was posed to me in an interview for internship.Question is taken from Commutation Process topic in portion Commutation Process & Excitation Methods of DC Machines
Answer» CORRECT choice is (c) Increase in acceleration of commutation To explain: To speed up the commutation process, the reactance VOLTAGE must be neutralized by injecting a SUITABLE polarity dynamical (speed) voltage into the commutating coil. In order that this injection is restricted to commutating coils, narrow interpoles are provided in the INTERPOLAR region.

Discussion

No Comment Found

Related InterviewSolutions

Vt= Ea– Ia(Ra+ Rse) is the equation for _______________(a) Short shunt compound motoring mode(b) Short shunt compound generating mode(c) long shunt compound motoring mode(d) Cannot be determinedI had been asked this question in an online quiz.I want to ask this question from Methods of Excitation in section Commutation Process & Excitation Methods of DC Machines
Which winding in compound excitation is responsible for change in air gap flux per pole?(a) Series(b) Parallel(c) Interconnected(d) No coil is responsibleI have been asked this question in an online quiz.This intriguing question originated from Methods of Excitation in portion Commutation Process & Excitation Methods of DC Machines
If a DC compound machine connected as a motor is about to use as a generator, we reverse the series field connections.(a) True(b) FalseI have been asked this question in an online interview.Question is from Methods of Excitation topic in portion Commutation Process & Excitation Methods of DC Machines
How short shunt and long shunt compound winding is selected?(a) Mechanical considerations(b) Switch reversal(c) Performance(d) Mechanical considerations and switch reversalI have been asked this question at a job interview.Question is from Methods of Excitation topic in chapter Commutation Process & Excitation Methods of DC Machines
In differential compound excited machine, what is the variation in air gap flux per pole with respect to armature current?(a) Increases(b) Decreases(c) Remains constant(d) Always variesI had been asked this question in an interview for job.This interesting question is from Methods of Excitation in chapter Commutation Process & Excitation Methods of DC Machines
Which is more practical method used in control of series field?(a) Diverter(b) Tappings(c) Switch relay(d) Cannot be determinedThe question was posed to me during an internship interview.My doubt stems from Methods of Excitation topic in chapter Commutation Process & Excitation Methods of DC Machines
In compound excitation, which winding/s is/are excited?(a) Shunt(b) Series(c) Both(d) Cannot be determinedThis question was addressed to me by my college director while I was bunking the class.Question is from Methods of Excitation in portion Commutation Process & Excitation Methods of DC Machines
Which winding have higher resistance?(a) Shunt field(b) Series field(c) Both have same number of turns(d) Depends on requirementThis question was addressed to me in final exam.Question is from Methods of Excitation topic in chapter Commutation Process & Excitation Methods of DC Machines
Which winding contains wire with higher thickness?(a) Shunt field(b) Series field(c) Both have same number of turns(d) Depends on requirementThe question was asked during an online interview.I'd like to ask this question from Methods of Excitation topic in portion Commutation Process & Excitation Methods of DC Machines
Which winding has large number of turns?(a) Shunt field(b) Series field(c) Both have same number of turns(d) Depends on requirementI got this question in an online quiz.My question is based upon Methods of Excitation topic in portion Commutation Process & Excitation Methods of DC Machines

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment