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Heat Transfer

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

1.49
1
4.88
None of these

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Heat Transfer
Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)

X/KA
K/Ax
KA/x
A/Kx

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Heat Transfer
In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.

Geometric
Either A, B or C
Arithmetic
Logarithmic

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Heat Transfer
Stefan-Boltzman law applies to __________ body

black
grey
None of the listed here
white

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Heat Transfer
Nucleate boiling is promoted

None of these
On polished surfaces
On rough surfaces
In the absence of agitation

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Heat Transfer
An ejector is used to

Increase temperature
None of these
Remove condensate
Increase pressure

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