What is the value of the demagnetizing coefficient if the total number of teeth is greater than 10^7?(a) d = angle/360(b) d = angle/240(c) d = angle/540(d) d = angle/720I got this question in an interview for job.Question is taken from Design Preliminaries in section Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

What is the value of the demagnetizing coefficient if the total number

1.	What is the value of the demagnetizing coefficient if the total number of teeth is greater than 10^7?(a) d = angle/360(b) d = angle/240(c) d = angle/540(d) d = angle/720I got this question in an interview for job.Question is taken from Design Preliminaries in section Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
Answer» Correct ANSWER is (d) d = angle/720 To elaborate: If the total number of teeth is greater than 10^7 then the demagnetizing COEFFICIENT become the ratio of the angle and 720. Otherwise d is ONE half the ratio of the maximum number of teeth that can be situated WITHIN the angle to the total number of teeth.

Discussion

No Comment Found

Related InterviewSolutions

How many principle types of lubricants are available in the PMDC motor?(a) 2(b) 3(c) 5(d) 7This question was posed to me during an online interview.Enquiry is from Design Steps and Considerations in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
How many types of bearings are made use of in the PMDC motors?(a) 2(b) 3(c) 4(d) 5This question was posed to me in an interview for internship.My question is based upon Design Steps and Considerations topic in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
What type of gear is made use for the silent operation?(a) spur gears(b) helical gears(c) worm gears(d) spur gears and worm gearsI have been asked this question during an interview.Question is taken from Design Steps and Considerations topic in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
What type of gear is made use of in the high inertia motors?(a) spur gears(b) helical gears(c) worm gears(d) spur and helical gearsThis question was addressed to me in an interview for internship.My doubt is from Design Steps and Considerations in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
What type of gears are used in the small loads and low inertia motors?(a) spur gears(b) helical gears(c) worm gears(d) worm gears and helical gearsThe question was asked by my school teacher while I was bunking the class.This interesting question is from Design Steps and Considerations in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
How many types of gears are made use of in the PMDC motors?(a) 1(b) 2(c) 3(d) 4This question was addressed to me in an interview for job.I'd like to ask this question from Design Steps and Considerations topic in section Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
What is the solution to prevent the increase of resistance of motor windings?(a) higher ventilation arrangement(b) reduction in the number of poles(c) increase the coil windings(d) insulate the windingsThis question was addressed to me in exam.My doubt stems from Design Steps and Considerations in section Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
What does the inability of the motor to dissipate the heat cause?(a) causes high starting current(b) insulation failure(c) causes low starting current(d) causes high starting currentI got this question during an interview for a job.My question is from Design Steps and Considerations topic in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
What does the increase of the resistance of the motor winding cause?(a) high starting current(b) low motor torque(c) low starting current(d) high motor torqueI had been asked this question during an online interview.Origin of the question is Design Steps and Considerations in section Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
How many primary reasons are present for the thermal failure?(a) 3(b) 4(c) 2(d) 5This question was addressed to me during an internship interview.The origin of the question is Design Steps and Considerations in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment