1.

Which of the following is NOT the reason behind selecting marble for making 'formers' for inductance coils?1. It is comparatively cheap.2. It is a non-magnetic material.3. It can be easily machined. 4. It has a very small co-efficient of thermal expansion.

Answer» Correct Answer - Option 4 : It has a very small co-efficient of thermal expansion.

Criteria for selecting marble for making 'formers' for inductance coils:

  • It is a non-magnetic material.
  • It is comparatively cheap.
  • It can be easily machined. 
  • Increased mechanical resistance
  • Higher resistance for high temperatures
  • Better electrical isolation

 

'It has a very small co-efficient of thermal expansion' is NOT the reason behind selecting marble for making 'formers' for inductance coils.



Discussion

No Comment Found

Related InterviewSolutions