DC Machines Basics MCQs

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

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DC Machines Basics MCQs | Page 4 of 6

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Q31.
What are the number of the brushes in the lap winding?

a.

Double the number of poles

b.

Same as the number of poles

c.

Half the number of poles

d.

Two

Discuss
Answer: (b).Same as the number of poles
Q32.
When Copper brushes are used in DC machine?

a.

Where low voltage and high currents are involved

b.

Where high voltage and small currents are involved

c.

Cannot be determined

d.

Where low voltage and low currents are involved

Discuss
Answer: (a).Where low voltage and high currents are involved
Q33.
In DC generators, current is fed up to the external circuit from armature through _______

a.

Commutator

b.

Direct wire

c.

Slip rings

d.

Cannot be determined

Discuss
Answer: (a).Commutator
Q34.
What are the number of the brushes in the wave winding?

a.

Same or more than the number of poles

b.

Same or less than the number of poles

c.

Exactly half the number of poles

d.

Depends on other parameters

Discuss
Answer: (a).Same or more than the number of poles
Q35.
Which conductors are in point of contact with brushes?

a.

Lie under south pole

b.

Lie under north pole

c.

Lie in inter polar region

d.

Are farthest from the poles

Discuss
Answer: (c).Lie in inter polar region
Q36.
In case of DC machine winding, number of commutator segments is equal to ______

a.

Number of armature coils

b.

Number of armature coil sides

c.

Number of armature conductors

d.

Number of armature turns

Discuss
Answer: (a).Number of armature coils
Q37.
How total number of brushes in a commutator are determined in a given DC machine?

a.

Speed of armature

b.

Type of winding

c.

Voltage

d.

Amount of current to be collected

Discuss
Answer: (d).Amount of current to be collected
Q38.
In a DC generator the ripples in the direct emf generated can be reduced by________

a.

Using conductor of annealed copper

b.

Using commutator with large number of segments

c.

Using carbon brushes of superior quality

d.

Using equalizer rings

Discuss
Answer: (c).Using carbon brushes of superior quality
Q39.
The drop in the voltage for which of the following types of brush can be expected to be least?

a.

Graphite brushes

b.

Carbon brushes

c.

Metal graphite brushes

d.

Cannot be determined

Discuss
Answer: (c).Metal graphite brushes
Q40.
What is the requirement of the good commutation?

a.

Brushes should be of proper grade, size and material

b.

Brushes should smoothly run in the holders

c.

Smooth, concentric commutator properly undercut

d.

Brushes should be of proper grade, size, material, run smoothly in the holders and concentric commutator properly undercut

Discuss
Answer: (d).Brushes should be of proper grade, size, material, run smoothly in the holders and concentric commutator properly undercut
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