36. Silicon steel used for electrical purposes has silicon percentage of:

1. 1. 0.5%

   
   
   

   2. 25%

   
   
   

   3. 3.4%

   
   
   

   4. 12.5%

   
   
   

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   NA

   Correct Option: A

   NA

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37. Silicon steel is widely used in:

1. 1. cutting tools

   
   
   

   2. dies and punches

   
   
   

   3. electrical industry

   
   
   

   4. chemical industry

   
   
   

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   Silicon steel is widely used in electrical industry.

   Correct Option: C

   Silicon steel is widely used in electrical industry.

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38. Bakelite is a:

1. 1. acrylate

   
   
   

   2. silicon varnish

   
   
   

   3. thermoplastic synthetic resin

   
   
   

   4. phenol formaldehyde resin

   
   
   

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   Bakelite is a phenol formaldehyde resin.

   Correct Option: D

   Bakelite is a phenol formaldehyde resin.

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39. Thermoplastic and thermoset polymers differ in:

1. 1. Glass transition temperature

   
   
   

   2. Thermal behaviour

   
   
   

   3. Mechanical behaviour

   
   
   

   4. All of the above

   
   
   

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   Thermoplastic and thermoset polymers differ in Thermal behaviour.

   Correct Option: B

   Thermoplastic and thermoset polymers differ in Thermal behaviour.

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40. The permeability and permittivity of a medium are:

1. 1. independent to each other

   
   
   

   2. related by the velocity of EM waves

   
   
   

   3. related by the Boltzman constant

   
   
   

   4. All of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   The permeability and permittivity of a medium are related by the velocity of EM waves.

   Correct Option: B

   The permeability and permittivity of a medium are related by the velocity of EM waves.

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