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Heating and Welding - Interview Questions and Answers

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11. In induction heating ______ is abnormally high.
A. phase angle
B. frequency
C. current
D. voltage
Explanation:
12. The material of the heating element for a furnace should have
A. lower melting point
B. higher temperature coefficient
C. high specific resistance
D. all of the above
Explanation:
13. Which of the following has the highest value of thermal conductivity ?
A. Water
B. Steam
C. Solid ice
D. Melting ice
Explanation:
14. Induction furnaces are employed for which of the following ?
A. Heat treatment of castings
B. Heating of insulators
C. Melting aluminium
D. None of the above
Explanation:
15. Induction heating process is based on which of the following principles ?
A. Thermal ion release principle
B. Nucleate heating principle
C. Resistance heating principle
D. Electro-magnetic induction princi�ple
Explanation: