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Heating and Welding - Interview Questions and Answers

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31. For heating element high resistivity material is chosen to
A. reduce the length of heating element
B. increase the life of the heating element
C. reduce the effect of oxidation
D. produce large amount of heat
Explanation:
32. Radiations from a black body are proportional to
A. T1
B. T2
C. T3
D. T*
Explanation:
33. Resistance variation method of temperature control is done by connecting resistance elements in
A. series
B. parallel
C. series-parallel connections
D. star-delta connections
Explanation:
34. Which of the following will happen if the thickness of refractory wall of furnace is increased ?
A. Heat loss through furnace wall will increase
B. Temperature inside the furnace will fall
C. Temperature on the outer surface of furnace walls will drop
D. Energy consumption will increase
Explanation:
35. Due to which of the following reasons it is desirable to have short arc length ?
A. To achieve better heating
B. To increase the life of roof refractory
C. To have better stirring action
D. To reduce problem of oxidation
Explanation:
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