Mechanical Engineering - Thermodynamics

1. 

According to Kelvin-Planck's statement of second law of thermodynamics,

A. it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
B. it is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
C. it is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
D. none of the above

Answer: Option A

Explanation:

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2. 

According to Gay-Lussac law, the absolute pressure of a given mass of a perfect gas varies __________ as its absolute temperature, when the volume remains constant.

A. directly
B. indirectly

Answer: Option A

Explanation:

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3. 

According to Avogadro's law

A. the product of the gas constant and the molecular mass of an ideal gas is constant
B. the sum of partial pressure of the mixture of two gases is sum of the two
C. equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules
D. all of the above

Answer: Option C

Explanation:

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4. 

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

A. isothermal process
B. hyperbolic process
C. adiabatic process
D. polytropic process

Answer: Option A

Explanation:

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5. 

Which of the following gas has a minimum molecular mass?

A. Oxygen
B. Nitrogen
C. Hydrogen
D. Methane

Answer: Option C

Explanation:

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