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
Answer: Option B
Related Questions on Heating and Welding
A. To avoid initial rush of current
B. To avoid change in kW rating with temperature
C. Both (A) and (B)
D. Either (A) or (B)
The material of the heating element for a furnace should have
A. Lower melting point
B. Higher temperature coefficient
C. High specific resistance
D. All of the above
In induction heating __________ is abnormally high.
A. Phase angle
B. Frequency
C. Current
D. Voltage
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