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 8 of 13

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Q71.
In diverter resistor field control method of DC series motor, variable resistor is added ________

a.

In parallel with field

b.

In series with field

c.

In parallel with armature

d.

In parallel with load

Discuss
Answer: (a).In parallel with field
Q72.
Why it is advisable to use inductively wound diverter resistor?

a.

To make speed control on more range

b.

For long-life of machine

c.

Cost efficient

d.

To avoid oscillations in speed

Discuss
Answer: (d).To avoid oscillations in speed
Q73.
For higher diverter resistance, speed-torque characteristic will lie ____________

a.

Above speed-torque characteristic of lower resistance

b.

Below speed-torque characteristic of lower resistance

c.

On the speed-torque characteristic of lower resistance

d.

Cannot say

Discuss
Answer: (b).Below speed-torque characteristic of lower resistance
Q74.
In tapped field control method ____________

a.

A variable resistor is connected in parallel

b.

A variable resistor is connected in series

c.

Field winding is made with more out pins

d.

Another field winding is added with the previous one

Discuss
Answer: (c).Field winding is made with more out pins
Q75.
Which of the following method will not give many speed values for a DC series motor?

a.

Diverter

b.

Series-parallel

c.

Field tapped

d.

All field control methods will give many speed values

Discuss
Answer: (b).Series-parallel
Q76.
In series-parallel speed control method ______________

a.

Speed given by parallel connection is more

b.

Speed given by series connection is more

c.

Both speeds can be equal

d.

Will depend on other parameters

Discuss
Answer: (a).Speed given by parallel connection is more
Q77.
Where diverters are used?

a.

In shunt motors

b.

In series motors

c.

In both motors

d.

All other motors except shunt and series motors

Discuss
Answer: (b).In series motors
Q78.
What will happen to the speed of a series motor if the temperature of armature resistance is increased?

a.

Not change

b.

Decreases

c.

Increases

d.

Cannot be determined

Discuss
Answer: (b).Decreases
Q79.
For which speed control method we get minimum efficiency?

a.

Voltage control method

b.

Field control method

c.

Armature control method

d.

Cannot be determined

Discuss
Answer: (c).Armature control method
Q80.
The speed of a DC motor can be varied by changing ______________

a.

Field current

b.

Applied voltage

c.

Resistance in series with armature

d.

Field current, applied voltage or resistance in series with armature any method will work

Discuss
Answer: (d).Field current, applied voltage or resistance in series with armature any method will work
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