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Heat and Mass Transfer

Heat and Mass Transfer
The amount of radiation mainly depends on

Nature of body
Temperature of body
All of these
Type of surface of body

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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

40 mm
160 mm
25 mm
800 mm

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Heat and Mass Transfer
When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

α = 0, ρ = 0 and τ = 1
α + ρ = 1 and τ = 0
α = 1, ρ = 0 and τ = 0
α = 0, ρ = 1 and τ = 0

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Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

0.16736111111111
0.084027777777778
0.043055555555556
0.042361111111111

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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)

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

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Heat and Mass Transfer
The transfer of heat by molecular collision is known as

Radiation
None of these
Convection
Conduction

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MORE MCQ ON Heat and Mass Transfer

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