216. In ‘plasma’ state a gas:

1. 1. loses electrical conductivity

   
   
   

   2. attracts moisture

   
   
   

   3. becomes perfect dielectric medium

   
   
   

   4. conducts electricity

   
   
   

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1. View Hint View Answer Discuss in Forum

   In ‘plasma’ state a gas conducts electricity.

   Correct Option: D

   In ‘plasma’ state a gas conducts electricity.

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217. Optical absorption and infrared absorption refer to:

1. 1. dielectric losses

   
   
   

   2. anti-ferroelectric behaviour

   
   
   

   3. properties of non-polar molecules

   
   
   

   4. relaxation time when a. c. field is switched-on

   
   
   

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1. View Hint View Answer Discuss in Forum

   Optical absorption and infrared absorption refer to dielectric losses.

   Correct Option: A

   Optical absorption and infrared absorption refer to dielectric losses.

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218. Silicon steel is widely used in:

1. 1. cutting tools

   
   
   

   2. dies and punches

   
   
   

   3. electrical industry

   
   
   

   4. chemical industry

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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219. Polarization in polyatomic gases is the sum of (notations carry their usual meaning):

1. 1. P_e + P_o + P_i + P_s

   
   
   

   2. P_e only

   
   
   

   3. P_e + P_i

   
   
   

   4. P_e + P_o + P_i

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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220. Insulating materials that can withstand a temperature above 180°C is of:

1. 1. class A type

   
   
   

   2. class B type

   
   
   

   3. class C type

   
   
   

   4. class H type

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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