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 12 of 13

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Q111.
Which of the following is the plugging method of braking?

a.

Reversal of field connections

b.

Reversal of armature connections

c.

Addition of equal and opposite field

d.

Removal of field circuit from current machine circuit

Discuss
Answer: (b).Reversal of armature connections
Q112.
Which of the following is correct formula for braking torque in plugging?

a.

n (ka²/Rb)

b.

n² (ka²/Rb)

c.

n⁻¹ (ka²/Rb)

d.

(ka²/Rb)

Discuss
Answer: (a).n (ka²/Rb)
Q113.
Electrical braking of any variety becomes less effective as ________________

a.

Speed increases

b.

Speed decreases

c.

Independent of speed

d.

Depends on supply voltage

Discuss
Answer: (b).Speed decreases
Q114.
Plugging is applied in a motor, if we don’t make the switch OFF what will happen?

a.

Motor will come to rest as a result of plugging

b.

Motor will come to rest and will start rotating in another direction

c.

Motor will burn

d.

Nothing will happen

Discuss
Answer: (b).Motor will come to rest and will start rotating in another direction
Q115.
Plugging is used in ____________

a.

Small motors only

b.

Small and medium powered

c.

Only in large heavy machines

d.

Everywhere

Discuss
Answer: (a).Small motors only
Q116.
Which of the following is dynamic braking?

a.

Reversal of field connections

b.

Reversal of armature connections

c.

Addition of equal and opposite field

d.

Removal of armature circuit from current machine circuit

Discuss
Answer: (d).Removal of armature circuit from current machine circuit
Q117.
Braking time in the dynamic braking is the function of _____________

a.

System inertia

b.

Load torque

c.

Motor rating

d.

All- system inertia, load torque and motor rating

Discuss
Answer: (d).All- system inertia, load torque and motor rating
Q118.
In dynamic braking, when braking is applied system acts as ___________

a.

Freely running machine

b.

Motor with slow speed

c.

Generator

d.

Motor with same speed in opposite direction

Discuss
Answer: (c).Generator
Q119.
In which of the following electrical braking method, energy is supplied back to the supply?

a.

Plugging

b.

Dynamic braking

c.

Regenerative braking

d.

In all electrical braking

Discuss
Answer: (c).Regenerative braking
Q120.
Regenerative braking is used when duty cycle ____________

a.

Requires braking of machine

b.

Requires accelerating of machine

c.

Requires constancy of machine

d.

Cannot comment on duty cycle

Discuss
Answer: (a).Requires braking of machine
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