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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

1
4.88
None of these
1.49

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Heat Transfer
Heat transfer rate described by Fourier's law will decrease, if the __________ increases.

Thickness
Heat transfer area
Temperature difference
Thermal conductivity

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Heat Transfer
In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

Minimum
Zero
Infinity
Maximum

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Heat Transfer
A composite flat wall of a furnace is made of two materials 'A' and 'B'. The thermal conductivity of 'A' is twice of that of material 'B', while the thickness of layer of 'A' is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material 'A' is

150
160
133
125

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Heat Transfer
The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law.

Wien's displacement
Stefan-Boltzman's
None of these
Planck's

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Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Scaling
Highly viscous
Salty

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