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Engineering Thermodynamics

Engineering Thermodynamics
Superheated vapour behaves

As ordinary vapour
As steam
Exactly as gas
Approximately as a gas

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Engineering Thermodynamics
Compressed air coming out from a punctured football

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

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Engineering Thermodynamics
The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

Law of equipartition of energy
Law of degradation of energy
Law of conservation of energy
None of the listed here

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

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Engineering Thermodynamics
The change of entropy, when heat is absorbed by the gas, is

Positive or negative
Negative
None of these
Positive

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Engineering Thermodynamics
For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)

T/P = constant, if v is kept constant
P/T = constant, if v is kept constant
V/T = constant, if p is kept constant
P v = constant, if T is kept constant

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MORE MCQ ON Engineering Thermodynamics

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