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Engineering Thermodynamics

Engineering Thermodynamics
The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)

v2/v1
v1/v2
(v1 + v2)/v1
(v1 + v2)/v2

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Engineering Thermodynamics
Which of the following is not the intensive property?

Heat
Density
Temperature
Pressure

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Engineering Thermodynamics
Compressed air coming out from a punctured football

Becomes hotter
May become hotter or cooler depending upon the humidity of the surrounding air
Remains at the same temperature
Becomes cooler

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Engineering Thermodynamics
The principal constituents of a fuel are

Sulphur and hydrogen
Sulphur and oxygen
Carbon and hydrogen
Oxygen and hydrogen

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Engineering Thermodynamics
The polytropic index (n) is given by

log [(p1v1)/(p2v2)]
log (p1p2)/log (v1v2)
log (v1/ v2)/ log (p1/p2)
log (p2/ p1)/log (v1/ v2)

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Engineering Thermodynamics
To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is

Multiplied by its molecular weight
Multiplied by its specific weight
Multiplied by its density
Divided by its molecular weight

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