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Heat and Mass Transfer

Heat and Mass Transfer
Free convection flow depends on

Density
Coefficient of viscosity
All of these
Gravitational force

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Heat and Mass Transfer
The heat transfer by conduction through a thick sphere is given by

Q = 2πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 6πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 4πkr1 r2 (T1 - T2)/ (r2 - r1)
Q = 8πkr1 r2 (T1 - T2)/ (r2 - r1)

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Heat and Mass Transfer
Depending on the radiating properties, a body will be white when(Where a = absorptivity, p = reflectivity, x = transmissivity)

P = 0, x = 1 and a = 0
P=1, T = 0 and a = 0
P = 0, x = 0 and a = 1
X = 0, a + p = 1

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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
25 mm
40 mm
160 mm

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Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

None of these
1/h₁ + 1/h₂ + 1/h₃
(h₁.h₂.h₃)1/3
h₁ + h₂ + h₃

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

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

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