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MCQs 1: By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?

Coreless transformers Current transformers Motor-generator set Multi-phase transformer
Answer Explanation

MCQs 2: The temperature inside a furnace is usually measured by which of the following ?

Optical pyrometer Mercury thermometer Alcohol thermometer Any of the above
Answer Explanation

MCQs 3: Which of the following insulating materials was suitable for low temperature applications ?

Asbestos paper Diatomaceous earth 80 percent magnesia Cork
Answer Explanation

MCQs 4: The material of the heating element for a furnace should have___________?

lower melting point higher temperature coefficient high specific resistance all of the above
Answer Explanation

MCQs 5: In an electric room heat convector the method of heating used is______________?

arc heating resistance heating induction heating dielectric heating
Answer Explanation

MCQs 6: Induction furnaces are employed for which of the following ?

Heat treatment of castings Heating of insulators Melting aluminium None of the above
Answer Explanation

MCQs 7: Which of the following will happen if the thickness of refractory wall of furnace is increased ?

Heat loss through furnace wall will increase Temperature inside the furnace will fall Temperature on the outer surface of furnace walls will drop Energy consumption will increase
Answer Explanation

MCQs 8: A non-dimensional number generally associated with natural convection heat transfer is____________?

Prandtl number Grashoff number Pecelet number Nusselt number
Answer Explanation

MCQs 9: Induction heating process is based on which of the following principles ?

Thermal ion release principle Nucleate heating principle Resistance heating principle Electro-magnetic induction princi¬ple
Answer Explanation

MCQs 10: The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as_______________?

ablation radiation viscous dissipation irradiation
Answer Explanation

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