Efficiency and Testing MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Efficiency and Testing, 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 Efficiency and Testing 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 Efficiency and Testing mcq questions that explore various aspects of Efficiency and Testing problems. Each MCQ is crafted to challenge your understanding of Efficiency and Testing 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 Efficiency and Testing 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 Efficiency and Testing. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

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Efficiency and Testing MCQs | Page 1 of 4

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Q1.
The efficiency of the DC motor at maximum power will be ___________________

a.

100%

b.

Around 90%

c.

Anywhere between 75% and 90%

d.

Less than 50%

Discuss
Answer: (d).Less than 50%
Q2.
The hysteresis loss in a DC machine least depends on _____________

a.

Frequency of magnetic reversals

b.

Maximum value of flux density

c.

Volume and grade of iron

d.

Rate of flow of ventilating air

Discuss
Answer: (d).Rate of flow of ventilating air
Q3.
Which of the following is not the effect of iron loss?

a.

Loss of efficiency

b.

Excessive heating of core

c.

Increase in terminal voltage

d.

Rise in temperature of ventilating air

Discuss
Answer: (c).Increase in terminal voltage
Q4.
Which of the following loss is likely to have highest proportion at rated load of the DC generator?

a.

Hysteresis loss

b.

Field copper loss

c.

Armature copper loss

d.

Eddy current loss

Discuss
Answer: (c).Armature copper loss
Q5.
Which of the following loss in a DC generator varies significantly with the load current?

a.

Field copper loss

b.

Windage loss

c.

Armature copper loss

d.

Cannot be determined

Discuss
Answer: (c).Armature copper loss
Q6.
Which of the following methods is likely to result in reduction of hysteresis loss in a DC generator?

a.

Providing laminations in armature core

b.

Providing laminations in stator

c.

Using non-magnetic material for frame

d.

Using material of low hysteresis co-efficient for armature core material

Discuss
Answer: (d).Using material of low hysteresis co-efficient for armature core material
Q7.
Which of the following loss/losses in a DC generator is dissipated in the form of heat?

a.

Mechanical loss

b.

Core loss

c.

Copper loss

d.

Mechanical, Copper and Core

Discuss
Answer: (d).Mechanical, Copper and Core
Q8.
Which of the following losses are significantly reduced by laminating the core of a DC generator?

a.

Hysteresis losses

b.

Eddy current losses

c.

Copper losses

d.

Windage losses

Discuss
Answer: (b).Eddy current losses
Q9.
The total losses in a well-designed DC generator of 10 kW will be nearly equal to ________

a.

100 W

b.

500 W

c.

1000 W

d.

1500 W

Discuss
Answer: (b).500 W
Q10.
The condition for maximum efficiency for a DC generator is __________

a.

Eddy current losses = stray losses

b.

Hysteresis losses = eddy current losses

c.

Copper losses = 0

d.

Variable losses = constant losses

Discuss
Answer: (d).Variable losses = constant losses
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