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 4 of 13

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Q31.
For which motors DOL starter can be used?

a.

Up to 5 H.P

b.

Up to 10 H.P

c.

Up to 15 H.P

d.

Up to 20 H.P

Discuss
Answer: (a).Up to 5 H.P
Q32.
A three-point starter is used for _________

a.

Shunt motors

b.

Shunt as well as compound motors

c.

Shunt, compound and series motors

d.

Not for DC motors

Discuss
Answer: (b).Shunt as well as compound motors
Q33.
The starting resistance of a DC shunt motor is generally ______

a.

low

b.

Around 0.5 kΩ

c.

Around 5 kΩ

d.

Infinitely large

Discuss
Answer: (a).low
Q34.
In a manual shunt motor starter relay positions are ________________________

a.

Over load relay is connected in series and no volt relay in parallel with the load

b.

Over load relay is connected in parallel and no volt relay in series with the load

c.

Over load relay and no volt relay are both connected in series with the load

d.

Over load relay and no volt relay are both connected in parallel with the load

Discuss
Answer: (a).Over load relay is connected in series and no volt relay in parallel with the load
Q35.
What will happen if DC motor is used without starter?

a.

Heavy sparking at brushes

b.

It’ll start smoothly

c.

Will not start at all

d.

Depends on load

Discuss
Answer: (a).Heavy sparking at brushes
Q36.
Motor will start quickly when used without starter.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q37.
In shunt and compound motor starting the shunt field should be made on with full starting resistance in ____________

a.

Series with field

b.

Parallel with field

c.

Series with armature

d.

Parallel with armature

Discuss
Answer: (c).Series with armature
Q38.
A starter is required for a 220-V shunt motor. The maximum allowable current is 55 A and the minimum current is about 35 A. The armature resistance of the motor is 0.4 Ω. What will be the number of sections of starter resistance required?

a.

5

b.

4

c.

6

d.

8

Discuss
Answer: (c).6
Q39.
γ is given as 1.585. Resistance at maximum allowable current is given equal to 4 Ω, what is the 5th step resistance?

a.

0.235

b.

0.370

c.

1.476

d.

2

Discuss
Answer: (a).0.235
Q40.
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 anywhere

Discuss
Answer: (c).Motor field current is varied over wide range
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