Specifications

Part - B

Answer the following questions in one or two words (1 Mark)

1. What property should be more for the insulating material to be thinner?

2. Which classes of insulating material can withstand temp.s of 155

C and 180

respectively?

3. What is the insulation class of NOMEX material?

4. In motor winding applications, where film paper is used?

5. What is the name of the MICA splitting bonded to electrical grade paper?

6. Which is called as secondary insulation in a motor?

7. Give two examples of Thermoplastic material?

8. Give two examples of Thermosetting plastic material?

9. Which type of rubber can maintain its properties even at low temperature(eg.,0 - 5

C)?

10. Which type of varnish is mostly air drying type and more often applied by hand?

Part - C

Answer the following question briefly (4 Marks)

1. What are the areas in which insulating materials are used?

2. List the classes in which insulating materials are classified based on Temperature?

3. Give two examples of insulating materials in each of the above classes.

4. List four important characteristics of a good insulating material.

5. Classify the forms/shapes in which the insulating materials are used?

6. List some of the insulation materials in which sleeves are made?

Part - D

Answer the following question in one page level (10 Marks)

1. Discuss about the properties of any four insulating materials used in coil winding of Electric

motors.

2. What are differences between Thermoplastic and thermosetting plastics? Discuss the

properties of any two materials from each category.