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Heating and Welding - Interview Questions and Answers

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21. Hysteresis loss and eddy current loss are used in
A. induction heating of steel
B. dielectric heating
C. induction heating of brass
D. resistance heating
Explanation:
22. In the indirect resistance heating method, maximum heat-transfer takes place by
A. radiation
B. convection
C. conduction
D. any of the above
Explanation:
23. 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
Explanation:
24. In arc furnace the function of choke is
A. to stabilize the arc
B. to imprpve, power factor
C. to reduce severity of the surge
D. none of the above
Explanation:
25. It is desirable to operate the arc furnaces at power factor of
A. zero
B. 0.707 lagging
C. unity
D. 0.707 leading
Explanation:
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