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Heat Transfer

Heat Transfer
Removal of __________ heat is involved in the condensation of a vapor under saturated conditions.

Super
Sensible
Latent
Both B & C

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Heat Transfer
Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is

0.7
0.6
0.5
0.4

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Heat Transfer
The energy radiated from a surface Q at absolute temperature T is related as

Q ∝ T⁴
Q ∝ T²
Q ∝ T³
None of these

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Heat Transfer
What is the emissivity of a black body?

1
0.5
0.9

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Heat Transfer
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when

CPA < CPB
CPA > CPB
KA>2 kB
KA < 0.5kB

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Heat Transfer
(Cp . μ)/K is termed as the __________ number.

Prandtl
Nusselt
Grashoff
Stanton

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