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Heating and Welding - Interview Questions and Answers

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41. When a body reflects entire radiation incident on it, then it is known as
A. white body
B. grey body
C. black body
D. transparent body
Explanation:
42. The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earth's atmosphere is known as
A. ablation
B. radiation
C. viscous dissipation
D. irradiation
Explanation:
43. ________ has the highest value of thermal conductivity.
A. Copper
B. Aluminium
C. Brass
D. Steel
Explanation:
44. Which of the following insulating materials was suitable for low temperature applications ?
A. Asbestos paper
B. Diatomaceous earth
C. 80 percent magnesia
D. Cork
Explanation:
45. By which of the following methods the temperature inside arc nace can be varied ?
A. By disconnecting some of the heating elements
B. By varying the operating voltage
C. By varying the current through heating elements
D. By any of the above method
Explanation:
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