Important Electric Heating Multiple Choice Questions and Answers
6. ...........has the highest value of thermal conductivity
A. Copper
B. Aluminium
C. Brass
D. Steel
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A. Copper
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7. Which of the following heating methods has maximum power factor ?
A. Arc heating
B. Dielectric heating
C. Induction heating
D. Resistance heating
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8. For the transmission of heat from one body to another
A. Temperature of the two bodies must be different
B. Both bodies must be solids
C. Both bodies must be in contact
D.. At least one of the bodies must have some source of heating
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9. Heat transfer by condition will not occur when
A. Bodies are kept in vacuum
B. Bodies are immersed in water
C. Bodies are exposed to thermal radiations
D. Temperatures of the two bodies are identical
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10. Which of the following methods of heating is not dependent on the frequency of supply?
A. Induction heating
B. Dielectric heating
C. Electrical resistance heating
D. All of the above
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