Which of the following material has highest value of thermal diffusivity?
A) Steel
B) Concrete
C) Lead
D) Mineral wool
E) Wood
Correct Answer:
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Q21: The material preferred for the fabrication of
Q22: Gases have poor
A)Absorptivity
B)Transmissivity
C)Reflectivity
D)Reflectivity + absorptivity
E)Absorptivity + transmissivity
Q23: Which is not the assumption in Fourier's
Q24: Unsteady state of heat flow occurs in
A)Flow
Q25: Which of the following has higher thermal
Q27: The quantity of heat required to change
Q28: For temperature below -40°C which one of
Q29: The conditions under which three phases of
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Q31: A thermistor is a
A)Miniature resistance
B)Thermo-couple
C)Thermometer
D)Thermal insulation
E)Thermal resistance
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