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 1 of 13

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Q1.
What will happen if DC shunt motor is connected across AC supply?

a.

Will run at normal speed

b.

Will not run

c.

Will Run at lower speed

d.

Burn due to heat produced in the field winding

Discuss
Answer: (d).Burn due to heat produced in the field winding
Q2.
What will happen if the back emf of a DC motor vanishes suddenly?

a.

The motor will stop

b.

The motor will continue to run

c.

The armature may burn

d.

The motor will run noisy

Discuss
Answer: (c).The armature may burn
Q3.
What will happen, with the increase in speed of a DC motor?

a.

Back emf increase but line current falls.

b.

Back emf falls and line current increase.

c.

Both back emf as well as line current increase.

d.

Both back emf as well as line current fall.

Discuss
Answer: (a).Back emf increase but line current falls.
Q4.
Which part will surely tell that given motor is DC motor and not an AC type?

a.

Winding

b.

Shaft

c.

Commutator

d.

Stator

Discuss
Answer: (c).Commutator
Q5.
In DC motor, which of the following part can sustain the maximum temperature rise?

a.

Field winding

b.

Commutator

c.

Slip rings

d.

Armature winding

Discuss
Answer: (a).Field winding
Q6.
Direction of rotation of motor is determined by ____________

a.

Faraday’s law

b.

Lenz’s law

c.

Coulomb’s law

d.

Fleming’s left-hand rule

Discuss
Answer: (d).Fleming’s left-hand rule
Q7.
The current drawn by the armature of DC motor is directly proportional to ________________

a.

Torque

b.

Speed

c.

The voltage across the terminals

d.

Cannot be determined

Discuss
Answer: (a).Torque
Q8.
Which power is mentioned on a name plate of a motor?

a.

Gross power

b.

Power drawn in kVA

c.

Power drawn in kW

d.

Output power available at the shaft

Discuss
Answer: (d).Output power available at the shaft
Q9.
An electric motor is having constant output power. So, motor will have a torque speed characteristic _______________________

a.

Circle about the origin.

b.

Straight line parallel to the speed axis.

c.

Straight line through the origin.

d.

Rectangular hyperbola

Discuss
Answer: (d).Rectangular hyperbola
Q10.
Which of the following quantity will decrease if supply voltage is increased?

a.

Starting torque

b.

Operating speed

c.

Full-load current

d.

Cannot be determined

Discuss
Answer: (c).Full-load current
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