DC Motors — 5 | Objective Type Question Answers

#1 In a DC motor, energy conversion is possible only due to

production of opposing back e.m.f. Eb in the armature

#2 The speed of a D.C. motor, under constant load conditions, is affected by

field flux

#3 A series motor is best suited for driving

cranes and hoists

#4 While starting a differential compound motor, it is best to short the series field in order to avoid

motor starting in wrong direction

#5 In a D.C. motor constant torque is produced due to

commutator

#6 The operation of electric generators and motors depend on the interaction between magnetic field and

electric current

#7 All motors, basically, operate on the principle of either repulsion or

induction

#8 The maximum end-play of a motor is about

0.4 mm

#9 If the no-voltage release of a D.C. motor starter fails to work, on resumption of supply after a break, the motor will

get damaged

#10 A D.C. series motor, as compared to shunt and compound motors, has the highest torque at the start because of its comparatively

stronger series field

#11 The mechanical power developed by a D.C. motor is equal to

back em.f. x armature current

#12 Between Field’s test and Hopkinson’s test the main common thing is that both

need two similar mechanically coupled motors

#13 The use of armature divertor in the rheostatic method of speed control for a D.C. shunt motor makes the method

suitable for rapidly changing loads

#14 The series parallel system of speed control of D.C. series motors widely used in traction work gives a speed range of about

1 : 4

#15 If conditions for maximum power for a D.C. motor are established the efficiency of the motor will be

less than 50%

#16 In which of the following tests only one motor is required

Brake test

#17 In Field’s test for series motors, one motor drives the other machine as

separately excited generator

#18 A motor for punching machine is usually subjected to

intermittent load

#19 Which of the following is not necessarily the advantage of D.C. motors over A.C. motors ?

Low cost

#20 The armature shaft of a D.C. motor must be able to withstand

all of the above

#21 In an overloaded motor main danger arises due to

winding getting overheated

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Electrical Engineering MCQ Question Answer

 
On my blog, I have started this new section “Electrical Engineering MCQ Question Answer” on the repeated demand on my readers. I hope this section will prove helpful for electrical engineering students who are preparing for different competitive exams.

Electrical Engineering MCQ Question Answer

 
The world of today is an arena of competition. Almost in every sphere of life we have to face competition to get vertical for even horizontal mobility. Specifically, students have to pass Competitive Examinations for seeking admission to higher level education in different areas of specialisation as well as for seeking jobs in areas of their choice. Even the persons in job have to pass competitive examinations to get higher posts.
 
This MCQ section is an honest effort towards fulfilling these aspirations in fields connected with “Electrical Engineering”.
The questions have been framed in such a way that maximum important information is made available to the reader on various topics covered under the subject of “Electrical Engineering”.
Any suggestion and constructive criticism will be always wellcome for further improvement of this MCQ section.
 
Electrical engineering mcq question answer are finding favor with various examining organizations. These tests generally contain multiple choice questions in which four or five possible answers are offered and the job of an examinee is to select only the best answer. Sometimes the incorrect answers provided are partially correct. These partially true choices are inserted to force the candidate to think and establish that he knows the correct answer.

  • Hints for Identifying the Correct Answer
  • Read the item closely to see what the examiner is after.
  • Re-read if necessary.
  • Mentally reject answers that are clearly wrong.
  • Identify the most correct answer.
  • In the case of items where you are doubtful of the answer, you might be able to bring to bear the information you have gained from your previous study. This knowledge might be sufficient to indicate that some of the suggested answers are not so plausible. Eliminate such answers from further consideration.
  • Then concentrate on the remaining suggested answers. The more you eliminate in this way, the better your chances of getting the right item.
  • The pressure of time compels for speedy identification of correct answers. If you have identified the correct answer, switch over to the next question.
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