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mechanical engineering heat transfer refrigeration and air conditioning
1. Thermal conductivity of a material may be defined as the
(A): all of the above
(B): heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
(C): 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
(D): quantity of heat flowing in one second through one cm of material when opposite faces are maintained at a temperature difference of 1° C
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