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Heat and Mass Transfer

Heat and Mass Transfer
Free convection flow depends on

Gravitational force
Density
All of these
Coefficient of viscosity

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Heat and Mass Transfer
Unit of thermal diffusivity is

m²/hr °C
kcal/m. hr °C
kcal/m² hr
m²/hr

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Heat and Mass Transfer
Unit of thermal conductivity in M.K.S. units is

K cal/hr m² °C
K cal/kg m² °C
K cal m/hr m² °C
K calm/hr °C

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Heat and Mass Transfer
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

800 mm
40 mm
160 mm
25 mm

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Heat and Mass Transfer
40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

0.45
0.4
0.55
0.75

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Heat and Mass Transfer
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

Maximum energy
None of these
Minimum energy
Both (A) and (B)

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MORE MCQ ON Heat and Mass Transfer

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