Design of Electrical Machines Mock Test 1

10%

Question 1 of 10

1. How many classifications of magnetic materials are present?

Question 1 of 10

Question 2 of 10

2. High resistivity material used in making the filaments of incandescent lamps.

true

false

Question 2 of 10

Question 3 of 10

3. What is the main objective of power ratings of machines?

helps in classifying the machines into different types

helps in building a suitable physical model of machines

helps in building a suitable thermal model of machines

helps to improve the machine efficiency

Question 3 of 10

Question 4 of 10

4. What is the unit of reluctance in magnetic materials?

Ampere-turns/m

Henry/m

Ampere-turns/Weber

Weber/m²

Question 4 of 10

Question 5 of 10

5. Which among the following is the example of Class B?

Wood

Hard fiber

Inorganic material with adhesives

Impregnated oil

Question 5 of 10

Question 6 of 10

6. What is the formula for calculating the minimum number of coils?

Cmin = Voltage/15

Cmin = Voltage/5

Cmin = Voltage

Cmin = Voltage/10

Question 6 of 10

Question 7 of 10

7. How should the properties of strength and dielectric strength in insulating materials?

Low strength, low Dielectric strength

High strength, low Dielectric strength

High strength, high Dielectric strength

Low strength, high Dielectric strength

Question 7 of 10

Question 8 of 10

8. If the power ratings are crossed, machine breakdown occurs.

True

False

Question 8 of 10

Question 9 of 10

9. What is the ideal condition for thermal dissipation?

Heat generated > Heat Dissipated

Heat generated = Heat Dissipated

Heat generated < Heat Dissipated

Heat generated = 0

Question 9 of 10

Question 10 of 10

10. Which material is commonly used in brushes?

copper

silicon

steel

carbon

Question 10 of 10