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Heating and Welding - Interview Questions and Answers

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26. In direct arc furnace, which of the following has high value ?
A. Current
B. Voltage
C. Power factor
D. All of the above
Explanation:
27. Which of the following is an advantage of eddy current heating ?
A. The amount of heat generated can be controlled accurately
B. Heat at very high rate can be gene-rated
C. The area of the surface over which heat is produced can be accurately controlled
D. All of the above
Explanation:
28. Radiant heating is used for which of the following ?
A. Annealing of metals
B. Melting of ferrous metals
C. Heating of liquids in electric kettle
D. Drying of paints and varnishes
Explanation:
29. The electrode of a direct arc furnace is made of
A. tungsten
B. graphite
C. silver
D. copper
Explanation:
30. Direct arc furnaces have which of the following power factors ?
A. Unity
B. Low, lagging
C. Low, leading
D. Any of the above
Explanation:
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