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Heat and Mass Transfer

Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

3
9
270
81

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

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Heat and Mass Transfer
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

All of these
Counter flow
Cross flow
Parallel flow

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Heat and Mass Transfer
Temperature of steam at around 540°C can be measured by

None of these
Thermometer
Thermistor
Thermocouple

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Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Grashoff number and Prandtl number
Grashoff number, Prandtl number and Reynold number
Grashoff number and Reynold number
Prandtl number and Reynold number

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Heat and Mass Transfer
Fouling factor is used

In heat exchanger design as a safety factor
In case of Newtonian fluids
When a liquid exchanges heat with a gas
None of these

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