In induction heating ___________ is abnormally high?
In induction heating ___________ is abnormally high?
A. phase angle
B. frequency
C. current
D. voltage
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The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as_______________?
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. irradiationA non-dimensional number generally associated with natural convection heat transfer is____________?
A non-dimensional number generally associated with natural convection heat transfer is____________?A. Prandtl number
B. Grashoff number
C. Pecelet number
D. Nusselt numberWhen a body reflects entire radiation incident on it, then it is known as____________?
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 bodyWhich of the following methods is used to control temperature in resistance furnaces ?
Which of the following methods is used to control temperature in resistance furnaces ?A. Variation of resistance
B. Variation of voltage
C. Periodical switching on and off of the supply
D. All of the above methodsWhich of the following insulating materials was suitable for low temperature applications ?
Which of the following insulating materials was suitable for low temperature applications ?A. Asbestos paper
B. Diatomaceous earth
C. 80 percent magnesia
D. CorkWhich of the following methods of heating is not dependent on the frequency of supply ?
Which of the following methods of heating is not dependent on the frequency of supply ?A. Induction heating
B. Dielectric heating
C. Electric resistance heating
D. All of the above