256. The principle employed in strain gauge working is:

1. 1. piezoelectric

   
   
   

   2. capacitive

   
   
   

   3. resistive

   
   
   

   4. All of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   The principle employed in strain gauge working is piezoelectric.

   Correct Option: A

   The principle employed in strain gauge working is piezoelectric.

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257. Heating in microwave oven is due to:

1. 1. magnetostriction

   
   
   

   2. electrostriction

   
   
   

   3. eddy current

   
   
   

   4. Spontaneous polarization

   
   
   

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1. View Hint View Answer Discuss in Forum

   Heating in microwave oven is due to eddy current.

   Correct Option: C

   Heating in microwave oven is due to eddy current.

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258. Line insulators are made of:

1. 1. porcelain

   
   
   

   2. mica

   
   
   

   3. marble

   
   
   

   4. PVC

   
   
   

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1. View Hint View Answer Discuss in Forum

   Line insulators are made of porcelain.

   Correct Option: A

   Line insulators are made of porcelain.

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259. Capacitors to be used at high frequencies require a material whose loss angle is:

1. 1. low

   
   
   

   2. high

   
   
   

   3. uniform

   
   
   

   4. one

   
   
   

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1. View Hint View Answer Discuss in Forum

   Capacitors to be used at high frequencies require a material whose loss angle is low.

   Correct Option: A

   Capacitors to be used at high frequencies require a material whose loss angle is low.

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260. Dielectric loss is of the order of:

1. 1. 10⁴

   
   
   

   2. 10⁷

   
   
   

   3. 10^–4 to 10^–2

   
   
   

   4. 10⁰

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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