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Heating and Welding - Interview Questions and Answers

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16. In resistance heating highest working temperature is obtained from heating elements made of
A. nickel copper
B. nichrome
C. silicon carbide
D. silver
Explanation:
17. Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons ?
A. To avoid initial rush of current
B. To avoid change in kW rating with temperature
C. Both (a) and (b)
D. Either (a) or (b)
Explanation:
18. In heating the ferromagnetic material by induction heating, heat is produced due to
A. induced current flow through the charge
B. hysteresis loss taking place below curie temperature
C. due to hysteresis loss as well as eddy current loss takingplace in the charge
D. none of the above factors
Explanation:
19. Which of the following methods is used to control temperature in resistance furnaces ?
A. Variation of resistance
B. Variation of voltage
C. Periodical switching on and off of the supply
D. All of the above methods
Explanation:
20. For radiant heating around 2250�C, the heating elements are made of
A. copper alloy
B. carbon
C. tungsten alloy
D. stainless steel alloy
Explanation:
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