Characteristics of DC Motors MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Characteristics of 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 Characteristics of 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 Characteristics of DC Motors mcq questions that explore various aspects of Characteristics of DC Motors problems. Each MCQ is crafted to challenge your understanding of Characteristics 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 Characteristics of DC Motors MCQs are your pathway to success in mastering this essential DC Machines topic.

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Characteristics of DC Motors MCQs | Page 1 of 6

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Q1.
For machine tools, which DC motor can be used?

a.

DC Series motor

b.

DC Shunt motor

c.

DC cumulative compound motor

d.

DC differential compound motor

Discuss
Answer: (b).DC Shunt motor
Q2.
In a DC shunt motor, speed is related to armature current as _____________

a.

Directly proportional to the armature current

b.

Proportional to the square of the current

c.

Independent of armature current

d.

Inversely proportional to the armature current

Discuss
Answer: (d).Inversely proportional to the armature current
Q3.
In a DC shunt motor for zero armature current we get speed ______

a.

Non-zero and minimum

b.

Zero

c.

Non-zero and maximum

d.

Doesn’t depend on armature current

Discuss
Answer: (c).Non-zero and maximum
Q4.
What will be the effect of opening of field of a DC shunt motor while motor is running?

a.

The speed of motor will be reduced

b.

The armature current will reduce

c.

The motor will attain dangerously high speed

d.

The motor will continue to constant speed

Discuss
Answer: (c).The motor will attain dangerously high speed
Q5.
What will be the effect of reducing load on DC shunt motor?

a.

Speed will increase abruptly

b.

Speed will increase in proportion to reduction in load

c.

Speed will remain almost constant

d.

Speed will reduce

Discuss
Answer: (c).Speed will remain almost constant
Q6.
How speed of the DC shunt motor can be increased?

a.

Decreasing the field current

b.

Increasing the field current

c.

Decreasing the load current

d.

Increasing the armature current

Discuss
Answer: (b).Increasing the field current
Q7.
Practical reason behind speed of DC shunt motor is proportional to back emf only is ____________

a.

Back emf is equal to armature drop

b.

Flux is proportional to field current

c.

Flux is proportional to armature current

d.

Flux is practically constant in DC shunt motors

Discuss
Answer: (d).Flux is practically constant in DC shunt motors
Q8.
In a DC shunt motor, what will be the armature current at maximum load?

a.

Almost negligible

b.

Rated full-load current

c.

Less than full-load current

d.

More than full-load current

Discuss
Answer: (d).More than full-load current
Q9.
In which of the following motor, ratio of starting torque to full-load torque will be least?

a.

DC series motors

b.

DC shunt motors

c.

DC compound motors

d.

Synchronous motors

Discuss
Answer: (b).DC shunt motors
Q10.
As the load is increased the speed of DC shunt motor will ___________

a.

Reduce slightly

b.

Increase slightly

c.

Increase proportionately

d.

Reduce rapidly

Discuss
Answer: (a).Reduce slightly
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