Thermal conductivity of a material may be defined as the

A)
quantity of heat flowing in one second through one cm of material when opposite faces are maintained at a temperature difference of 1° C
B)
quantity of heat flowing in one second through a slab of the material of area 1 cm2 and thickness 1 cm when its faces differ in temperature by 1° C
C)
heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
D)
All of the above

Correct Answer : Option (D) :   All of the above

Recently Updated in Heat Transfer, Refrigeration and Air Conditioning Questions
The value of the wave length for maximum emissive power is given by
A)
Wein's law
B)
Stefan's law
C)
Planck's law
D)
Kirchhoff's law

Correct Answer :   Wein's law

Emissivity of a body will be equal to its absorptivity at all temperatures.
A)
Yes
B)
No
C)
Can Not Say
D)
None of the above

Correct Answer :   Yes

During dehumidification process, __________ remains constant.
A)
specific humidity
B)
dry bulb temperature
C)
relative humidity
D)
wet bulb temperature

Correct Answer :   dry bulb temperature

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