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 2 of 6

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Q11.
The armature torque of the DC shunt motor is proportional to

a.

Field flux only

b.

Armature current only

c.

Field flux and armature current

d.

Field current

Discuss
Answer: (b).Armature current only
Q12.
If a DC shunt motor is working at full load and if shunt field circuit suddenly opens _____________________

a.

Will make armature to take heavy current, possibly burning it

b.

Will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses

c.

Nothing will happen to motor

d.

Motor will come to stop

Discuss
Answer: (a).Will make armature to take heavy current, possibly burning it
Q13.
Speed of DC shunt motor is directly proportional to___________

a.

Flux

b.

Back emf

c.

Terminal voltage

d.

Armature resistance drop

Discuss
Answer: (b).Back emf
Q14.
Speed torque characteristic of DC shunt motor is _______________

a.

Starting from origin

b.

Starting from speed axis and increasing

c.

Starting from speed axis and decreasing

d.

Starting from speed axis and constant

Discuss
Answer: (c).Starting from speed axis and decreasing
Q15.
For some percentage increase in the torque, which DC motor will have the least percentage increase of input current?

a.

Series motor

b.

Shunt motor

c.

Cumulative compound motor

d.

Separately exited motor

Discuss
Answer: (a).Series motor
Q16.
DC Shunt Motor has a disadvantage __________

a.

Constant speed

b.

Less expensive

c.

Not suitable for rapidly changing loads

d.

Cannot be determined

Discuss
Answer: (c).Not suitable for rapidly changing loads
Q17.
DC series motors are used _______________

a.

Where load is constant

b.

Where load changes frequently

c.

Where constant operating speed is needed

d.

High starting speed

Discuss
Answer: (d).High starting speed
Q18.
Where compensating winding is provided in case of conductively compensated DC series motor?

a.

As separately wound unit

b.

In series with armature winding

c.

In parallel with armature winding

d.

In parallel with field winding

Discuss
Answer: (b).In series with armature winding
Q19.
No-load speed of which of the following DC motor will be highest?

a.

Shunt motor

b.

Series motor

c.

Cumulative compound motor

d.

Differentiate compound motor

Discuss
Answer: (b).Series motor
Q20.
The direction of rotation of a DC series motor shaft can be changed by _____________

a.

Interchanging supply terminals

b.

Interchanging field terminals

c.

Not possible

d.

Cannot be determined

Discuss
Answer: (b).Interchanging field terminals
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