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 6 of 13

Discover more Topics under DC Machines

Q51.
Which of the following starter can sufficiently start the DC series motor?

a.

3-point starter

b.

4-point starter

c.

2-point starter

d.

Cannot be determined

Discuss
Answer: (c).2-point starter
Q52.
The speed of a DC shunt motor can be increased by ______

a.

Increasing the resistance in armature circuit

b.

Increasing the resistance in field circuit

c.

Reducing the resistance in the field circuit

d.

Reducing the resistance in the armature circuit

Discuss
Answer: (b).Increasing the resistance in field circuit
Q53.
What will happen if excitation of DC shunt motor is changed?

a.

Torque will remain constant

b.

Torque and power both will change

c.

Torque will change but power will remain constant

d.

Torque, power and speed, all will change

Discuss
Answer: (c).Torque will change but power will remain constant
Q54.
If the speed of a DC shunt motor is increased, the back emf of the motor will ___________

a.

Increase

b.

Decrease

c.

Remain same

d.

Become zero

Discuss
Answer: (a).Increase
Q55.
The speed of a DC shunt motor can be made more than full load speed by __________

a.

Reducing the field current

b.

Decreasing the armature current

c.

Increasing the armature current

d.

Increasing the excitation current

Discuss
Answer: (a).Reducing the field current
Q56.
Speed regulation of DC shunt motor is calculated by ratio of difference of full load speed and no-load speed with full load speed.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q57.
Which speeds can be obtained from field control of DC shunt motor?

a.

Lower than rated speeds

b.

Greater than rated speeds

c.

Lower and greater than rated speeds

d.

Neither lower nor greater than rated speeds

Discuss
Answer: (b).Greater than rated speeds
Q58.
No load speed of the DC shunt motor is 1322 rpm while full load speed is 1182 rpm. What will be the speed regulation?

a.

12.82 %

b.

11.8 %

c.

16.6 %

d.

14.2 %

Discuss
Answer: (b).11.8 %
Q59.
Speed regulation of a DC shunt motor is equal to 10%, at no load speed of 1400 rpm. What is the full load speed?

a.

1233 rpm

b.

1273 rpm

c.

1173 rpm

d.

1123 rpm

Discuss
Answer: (b).1273 rpm
Q60.
Where will speed-torque characteristics will lie when armature reaction is considered?

a.

Below the speed-torque characteristics when armature reaction is not considered

b.

Above the speed-torque characteristics when armature reaction is not considered

c.

On the speed-torque characteristics when armature reaction is not considered

d.

Can be anywhere with the speed-torque characteristics when armature reaction is not considered

Discuss
Answer: (b).Above the speed-torque characteristics when armature reaction is not considered
Page 6 of 13