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Engineering Thermodynamics

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

pvn = C
pv = C
pv = m R T
pvγ = C

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Engineering Thermodynamics
Which of the following gas has a minimum molecular mass?

Hydrogen
Oxygen
Methane
Nitrogen

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Engineering Thermodynamics
According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as

Absolute temperature, if volume is kept constant
Temperature
None of these
Volume, if temperature is kept constant

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

25
73
21
23

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Engineering Thermodynamics
A heat exchange process in which the product of pressure and volume remains constant is known as

Isentropic process
Heat exchange process
Throttling process
Hyperbolic process

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Engineering Thermodynamics
A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

Polytropic process
Adiabatic process
Isothermal process
Hyperbolic process

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