Four-point starter is used when ______________(a) Motor field current is varied in narrow range(b) Motor speed is varied in small range(c) Motor field current is varied over wide range(d) Can be used anywhereI had been asked this question in an interview.Query is from Starting of DC Motors in portion DC Motors of DC Machines

Four-point starter is used when ______________(a) Motor field current

1.	Four-point starter is used when ______________(a) Motor field current is varied in narrow range(b) Motor speed is varied in small range(c) Motor field current is varied over wide range(d) Can be used anywhereI had been asked this question in an interview.Query is from Starting of DC Motors in portion DC Motors of DC Machines
Answer» Correct option is (c) MOTOR field current is varied over wide range The best I can explain: Three-point STARTER is EMPLOYED where motor field current can be varied in a narrow range and so does the motor SPEED while four-point starter is USED when motor field current can vary over a wide range and so does the motor speed.

Discussion

No Comment Found

Related InterviewSolutions

For which of the following motor dynamic braking is very effective?(a) Shunt motors(b) Separately excited motors(c) Series motors(d) Differential compound motorsThe question was asked by my college professor while I was bunking the class.Question is taken from Braking of DC Motors topic in portion DC Motors of DC Machines
When is the dynamic braking is employed?(a) Non-reversing drive(b) Reversing drive(c) Both Reversing and Non-reversing(d) Cannot tellI had been asked this question in an internship interview.My query is from Braking of DC Motors topic in division DC Motors of DC Machines
Which method of braking is generally used in elevators?(a) Plugging(b) Regenerative braking(c) Rheostatic braking(d) Mechanical brakingI had been asked this question during an internship interview.Question is taken from Braking of DC Motors in section DC Motors of DC Machines
Where dynamic braking is used?(a) Shunt motors(b) Series motors(c) Compound motors(d) All DC motorsI have been asked this question during an online interview.My enquiry is from Braking of DC Motors in portion DC Motors of DC Machines
Regenerative method of braking is based on ___________(a) Back emf is less than the applied voltage(b) Back emf is equal to the applied voltage(c) Back emf of rotor is more than the applied voltage(d) Cannot be determinedI have been asked this question during an interview.My question is taken from Braking of DC Motors topic in section DC Motors of DC Machines
During regenerative braking of DC motors ____________(a) Motor will run as a generator(b) Motor will reverse in direction(c) Motor will run at reduced speed(d) Motor will run as free rotating shaftI had been asked this question in a national level competition.My doubt stems from Braking of DC Motors in section DC Motors of DC Machines
The plugging braking gives the _____________(a) Zero torque braking(b) Smallest torque braking(c) Highest torque braking(d) Variable torque brakingI have been asked this question in an online quiz.Question is taken from Braking of DC Motors topic in division DC Motors of DC Machines
If the terminals of armature of DC motor are interchanged, this action will offer following kind of electrical braking ______________(a) Regenerative(b) Plugging(c) Dynamic braking(d) Depends on other parametersThe question was posed to me in my homework.This is a very interesting question from Braking of DC Motors topic in division DC Motors of DC Machines
Which of the following method is not used for regeneration?(a) Increasing field current(b) Increasing armature speed(c) Increasing supply voltage(d) Reducing supply voltageI have been asked this question in exam.My query is from Braking of DC Motors in chapter DC Motors of DC Machines
Regeneration is not easily possible for ____________(a) DC shunt motor(b) Separately excited motor(c) Compounding motor with weak series compounding(d) DC series motorThe question was asked in examination.My question is taken from Braking of DC Motors topic in division DC Motors of DC Machines

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment