1.

In electrical machines, insulating maternal of Class 'B' has maximum temperature withstand capacity of1. 160°C2. 130°C3. 200°C4. 105°C

Answer» Correct Answer - Option 2 : 130°C

Concept:

There are 7 class of insulating materials, each suitable for different application:

The permissible temperature limit at which the insulators may be worked safely without deterioration depends upon the type and class of the insulation as detailed below.

Class

Maximum temperature in °C

Class Y

Maximum temperature 90°C

Class A

Maximum temperature 105°C

Class E

Maximum temperature 120°C

Class B

Maximum temperature 130°C

Class F

Maximum temperature 155°C

Class H

Maximum temperature 180°C

Class C

Maximum temperature above 180°C (limited stability up to 225°C)

 


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