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Engineering Thermodynamics

Engineering Thermodynamics
In a reversible adiabatic process, the ratio of T1/T2 is equal to

(v1/v2)γ - 1/ γ
(v2/v1)γ - 1/ γ
(p2/p1)γ - 1/ γ
(p1/p2)γ - 1/ γ

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Engineering Thermodynamics
The efficiency of Diesel cycle depends upon

Pressure ratio
Cut-off ratio and compression ratio
Temperature limits
Compression ratio

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Engineering Thermodynamics
Which of the following laws is applicable for the behaviour of a perfect gas?

Charles ‘law
All of these
Boyle's law
Gay Lussac’s law

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

Positive
Negative
None of these
Positive or negative

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Engineering Thermodynamics
If the value of n = 0 in the equation pvn = C, then the process is called

Adiabatic process
Constant pressure process
Isothermal process
Constant volume process

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Engineering Thermodynamics
Compressed air coming out from a punctured football

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

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