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Engineering Thermodynamics

Engineering Thermodynamics
The general law for the expansion or compression of gases, is

pv = m R T
pvn = C
pv = C
pvγ = C

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Engineering Thermodynamics
On volume basis, air contains following parts of oxygen

25
21
77
23

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Engineering Thermodynamics
A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is

-140 kJ
-80 kJ
+60 kJ
-40 kJ

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Engineering Thermodynamics
One molecule of oxygen consists of __________ atoms of oxygen.

8
4
16
2

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Engineering Thermodynamics
If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle

Equal
More
Depends on other factors
Less

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Engineering Thermodynamics
The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

1 - (1/ rγ - 1)
1 - rγ - 1
1 + (1/ rγ - 1)
1 + rγ - 1

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