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Heat and Mass Transfer

Heat and Mass Transfer
LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is

Lower
Depends on the area of heat exchanger
Higher
Same

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Heat and Mass Transfer
The emissivity for a black body is

1
0.5
0.75

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Heat and Mass Transfer
Depending on the radiating properties, body will be transparent when (Where a = absorptivity, p = reflectivity, x = transmissivity)

P=1, x = 0, and a = 0
P = 0, x = 0 and a = 1
P = 0, x= 1, and a = 0
X = 0, a + p = 1

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Heat and Mass Transfer
Heat flows from one body to other when they have

Different atomic structure
Different temperatures
Different specific heat
Different heat contents

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Heat and Mass Transfer
Two balls of same material and finish have their diameters in the ratio of 2: 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of

0.16736111111111
0.084027777777778
0.043055555555556
0.042361111111111

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Heat and Mass Transfer
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

U.Cmin
Cmin/U
U/Cmin
U/A.Cmin

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MORE MCQ ON Heat and Mass Transfer

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