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.Management Sciences
Category: Heating and Welding
Ajax Wyatt furnace is started when____________?
A. it is filled below core level
B. it is filled above core level
C. it is fully empty
D. none of the above
In a domestic cake baking oven the temperature is controlled by________________?
A. voltage variation
B. thermostat
C. auto-transformer
D. series-parallel operation
Which of the following heating methods has maximum power factor ?
A. Arc heating
B. Dielectric heating
C. Induction heating
D. Resistance heating
A perfect black body is one that_____________?
A. transmits all incident radiations
B. absorbs all incident radiations
C. reflects all incident radiations
D. absorbs, reflects and transmits all incident radiations
In an electric press mica is used_____________?
A. as an insulator
B. as a device for power factor improvement
C. for dielectric heating
D. for induction heating
For radiant heating around 2250°C, the heating elements are made of____________?
A. copper alloy
B. carbon
C. tungsten alloy
D. stainless steel alloy
In the indirect resistance heating method, maximum heat-transfer takes place by____________?
A. radiation
B. convection
C. conduction
D. any of the above
By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?
A. Coreless transformers
B. Current transformers
C. Motor-generator set
D. Multi-phase transformer
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
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