In a DC machine fractional pitch winding is used to _______________(a) To improve cooling(b) To reduce sparking(c) To reduce copper losses(d) To increase generated EMFThe question was posed to me by my college director while I was bunking the class.My query is from Construction in portion DC Machines of DC Machines

In a DC machine fractional pitch winding is used to _______________(a)

1.	In a DC machine fractional pitch winding is used to _______________(a) To improve cooling(b) To reduce sparking(c) To reduce copper losses(d) To increase generated EMFThe question was posed to me by my college director while I was bunking the class.My query is from Construction in portion DC Machines of DC Machines
Answer» The correct choice is (B) To reduce sparking Best EXPLANATION: Due to poor performance of brush, poor UNDERCUTTING of commutator, incorrect spring pressure sparking at brush faces happen. To OVERCOME this sparking fractional pitch winding is used.

Discussion

No Comment Found

Related InterviewSolutions

The armature of DC motor is laminated to ____________(a) To reduce mass(b) To reduce hysteresis loss(c) To reduce eddy current loss(d) To reduce inductanceI have been asked this question by my college director while I was bunking the class.I want to ask this question from Construction in portion DC Machines of DC Machines
If a DC motor is connected to AC supply what will happen then?(a) Not run(b) Burn(c) Run at normal speed(d) Run at extremely low speedThe question was asked in semester exam.Query is from Construction in division DC Machines of DC Machines
In a DC machine, rectification process is carried out in order to get unidirectional output (DC). This rectification process is carried out by ______________(a) Half wave rectifier(b) Full wave rectifier(c) Mechanical rectification(d) Centre tapped rectifierI had been asked this question in a job interview.My question is taken from Construction in portion DC Machines of DC Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is _________(a) Field winding(b) Interpole Winding(c) Interpole and compensating winding together(d) Armature windingThe question was asked during an interview.My question comes from Construction topic in portion DC Machines of DC Machines
The angle (electrical) made by brushes with axes of adjoining filed poles is ______________(a) 450(b) 1800(c) 900(d) 300I got this question during an online interview.The above asked question is from Construction topic in division DC Machines of DC Machines
Where is field winding mounted in a DC machine?(a) Stator(b) Rotor(c) Absent(d) Anywhere on stator or rotorThis question was addressed to me in an interview for job.This intriguing question comes from Construction in division DC Machines of DC Machines
In a DC machine fractional pitch winding is used to _______________(a) To improve cooling(b) To reduce sparking(c) To reduce copper losses(d) To increase generated EMFThe question was posed to me by my college director while I was bunking the class.My query is from Construction in portion DC Machines of DC Machines
What are the materials used for brushes in dc machines?(a) Iron(b) Carbon(c) Aluminum(d) SteelI had been asked this question by my school principal while I was bunking the class.This key question is from Construction in section DC Machines of DC Machines
Which of the following part is used in construction of DC machine but not in AC machine?(a) Armature Winding(b) Field winding(c) Commutator(d) ShaftThis question was posed to me in quiz.Asked question is from Construction topic in section DC Machines of DC Machines
Function of yoke is to provide the return path for magnetic flux.(a) True(b) falseI had been asked this question in an international level competition.My question comes from Construction in chapter DC Machines of DC Machines

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment