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 9 of 13

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Q81.
For constant torque drive which of the following speed control method is preferred?

a.

Field control

b.

Armature voltage control

c.

Shunt armature control

d.

Voltage control

Discuss
Answer: (b).Armature voltage control
Q82.
When the armature of a DC motor rotates, emf induced is in machine is called as ___________

a.

Self-induced emf

b.

Mutually induced emf

c.

Back emf

d.

Cannot be determined

Discuss
Answer: (c).Back emf
Q83.
Which of the following method is used for DC motor with 12+ HP requiring frequent start, stop, speed reversal?

a.

Drum type controller is used

b.

Three-point starter is used

c.

Four-point starter is used

d.

Cannot be determined

Discuss
Answer: (a).Drum type controller is used
Q84.
Flux density distribution is distorted by armature control method.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q85.
In rheostatic series control method of armature we add ____________

a.

Variable resistor in parallel with armature

b.

Variable resistor in series with armature

c.

Fixed resistor in parallel with armature

d.

Fixed resistor in series with armature

Discuss
Answer: (b).Variable resistor in series with armature
Q86.
By series armature resistance method, we can get _________________________

a.

Speed above rated speed

b.

Speed equal to rated speed

c.

Speed below rated speed

d.

All speeds are possible

Discuss
Answer: (c).Speed below rated speed
Q87.
Consider the armature control method, where 10 Ω resistance is connected in series with armature in first case. For second case resistance value is changed 100 Ω. Then ____________

a.

Speed-torque characteristic of both will start from same point

b.

For first case speed-torque characteristic will start below to the case 2

c.

For first case speed-torque characteristic will start above to the case 2

d.

Can’t say because other parameters are unavailable

Discuss
Answer: (a).Speed-torque characteristic of both will start from same point
Q88.
Speed regulation of armature series control method is __________

a.

Very good

b.

Zero

c.

Poor

d.

Cannot comment

Discuss
Answer: (c).Poor
Q89.
In shunted rheostatic armature control method ______________

a.

Variable resistor is added in parallel with armature

b.

Variable resistor is added in series with armature

c.

Variable resistor is added in parallel with armature and another variable resistor is added in series

d.

Variable resistor is not added in whole circuit

Discuss
Answer: (c).Variable resistor is added in parallel with armature and another variable resistor is added in series
Q90.
Which of the following is correct statement?

a.

Speed regulation of rheostatic armature control method is better than that of shunted armature control

b.

Speed regulation of rheostatic armature control method is worse than that of shunted armature control

c.

Speed regulation of rheostatic armature control method is almost equal to that of shunted armature control

d.

Speed regulation of rheostatic armature control method and of shunted armature control are equally worst

Discuss
Answer: (b).Speed regulation of rheostatic armature control method is worse than that of shunted armature control
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