Important Electric Heating Multiple Choice Questions and Answers

11.  It is desirable to operates the arc furnaces at power factor of

   A. Zero

   B. 0.707 lagging

   C. Unity

   D. 0.707 leading

12.  Induction heating process is based on which of the following principles ?

   A. Thermal ion release principal

   B. Nucleate heating principal

   C. Resistance heating principal

   D. Electromagnetic induction principle

13.  Which of the following has the highest value of thermal conductivity ?

   A. Water

   B. Steam

   C. Solid ice

   D. Melting ice

14.  In an electric press mica is used

   A. As an insulator

   B. As a device for power sector improvement

   C. For dielectric heating

   D. For induction heating

15.  The temperature inside a furnace is usually measured by which of the following ?

   A. Optical Pyrometer

   B. Mercury thermometer

   C. Alcohol thermometer

   D. Any of the above

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