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Heat Transfer

Heat Transfer
Calburn analogy is applicable for the value of Prandtl number from

0.5 to 5
0.6 to 120
0.001 to 1
120 to 400

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Heat Transfer
In counter flow compared to parallel flow,

LMTD is greater
Both A and B
More surface area is required for a given heat transfer rate
Less surface area is required for a given heat transfer rate

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Heat Transfer
The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by __________ times, when the number of tube passes is increased to 8.

40.8
20.4
40.4
20.8

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Heat Transfer
The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)

∝ t
∝ 1/t
Independent of 't'
∝ √t

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Heat Transfer
Radiation heat transfer rates does not depend upon the

surface area and temperature of the heat source
distance between the heat source and the object receiving the heat
none of the listed here
type of absorbing surface

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Heat Transfer
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is

60000
24000
6000
48000

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