31. Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called
32. The rate of heat flow through a body is $${\text{Q}} = \frac{{{\text{kA}}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{\text{x}}}.$$ The term $$\frac{{\text{x}}}{{{\text{kA}}}}$$ is known as
33. Depending on the radiating properties, a body will be white when
(Where a = absorptivity, p = reflectivity, x = transmissivity)
(Where a = absorptivity, p = reflectivity, x = transmissivity)
34. Depending on the radiating properties, body will be transparent when
(Where a = absorptivity, p = reflectivity, x = transmissivity)
(Where a = absorptivity, p = reflectivity, x = transmissivity)
35. The expression Q = ρ AT4 is called
36. In heat transfer, conductance equals conductivity (kcal/hr/sq.m/°C/cm) divided by
37. The time constant of a thermocouple is
38. The total emissivity power is defined as the total amount of radiation emitted by a black body per unit
39. Heat transfer takes place as per
40. Thermal diffusivity is
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