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Heat Transfer

Heat Transfer
Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively)

CE
E/C
C/E
1/CE

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Heat Transfer
Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is

Both B and C
Thick walled
Having the value of Ao/Ai > 2
Thin walled having the value of Ao Ai/< 2

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Heat Transfer
Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is

83
4.364
0.72
18

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Heat Transfer
LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is

>1
Zero
<1
1

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Heat Transfer
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

1
20
10
30

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Heat Transfer
The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in lminar zone is related as

Ha= 5hL
Ha = 0.8hL
Ha = hL
Ha = 2hL

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