DC Motors MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on DC Motors, a fundamental topic in the field of DC Machines. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our DC Motors MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of DC Motors mcq questions that explore various aspects of DC Motors problems. Each MCQ is crafted to challenge your understanding of DC Motors principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace DC Machines tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our DC Motors MCQs are your pathway to success in mastering this essential DC Machines topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of DC Motors. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your DC Motors knowledge to the test? Let's get started with our carefully curated MCQs!

DC Motors MCQs | Page 2 of 13

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Q11.
In which of the following case we will get maximum power?

a.

Eₐ = 2 x supply voltage

b.

Eₐ = supply voltage

c.

Supply voltage = 2 x Eₐ

d.

supply voltage = 4 x Eₐ

Discuss
Answer: (c).Supply voltage = 2 x Eₐ
Q12.
Sometimes motor has to be de-rated.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q13.
The armature shaft of a DC motor must be able to withstand ______________

a.

Bending moment due to weight of the armature.

b.

Any unbalanced magnetic pull on the armature core.

c.

Twisting stains due to transmission of torque.

d.

Bending moment, unbalanced magnetic pull and twisting stains

Discuss
Answer: (d).Bending moment, unbalanced magnetic pull and twisting stains
Q14.
In DC machines the residual magnetism is present. The order of residual magnetism is ___________

a.

2 to 3 per cent

b.

10 to 15 per cent

c.

20 to 25 per cent

d.

50 to 75 per cent

Discuss
Answer: (a).2 to 3 per cent
Q15.
Sparking is discouraged in a DC motor.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q16.
Which of the following motor is used where high starting torque and wide speed range control is required?

a.

All motors

b.

Induction motor

c.

Synchronous motor

d.

DC motor

Discuss
Answer: (d).DC motor
Q17.
The armature voltage control of DC motor will provide ___________

a.

Constant power drive

b.

Constant voltage drive

c.

Constant current drive

d.

Constant torque drive

Discuss
Answer: (d).Constant torque drive
Q18.
As there is no back emf at the instant of starting a DC motor, in order to prevent a heavy armature current from flowing though the armature circuit ___________

a.

Series resistance is connected with armature

b.

Parallel resistance is connected to the armature

c.

armature is temporarily open circuited

d.

a high value resistor is connected across the field winding

Discuss
Answer: (a).Series resistance is connected with armature
Q19.
What will happen to torque if back emf and speed of the DC motor is doubled?

a.

Remain unchanged

b.

Reduce to one-fourth value

c.

Increase four folds

d.

Be doubled

Discuss
Answer: (a).Remain unchanged
Q20.
At the instant of starting, when a DC motor is put on supply, it will behave like ______________

a.

Highly resistive circuit

b.

Low resistance circuit

c.

Capacitive circuit

d.

Inductive circuit

Discuss
Answer: (b).Low resistance circuit
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