Thermodynamics - Mechanical Engineering Questions and Answers

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The atomic mass of oxygen is

121

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For the same compression ratio, the efficiency of dual combustion cycle is

Greater than Diesel cycle and less than Otto cycle

Greater than Diesel cycle

Less than Diesel cycle

Less than Diesel cycle and greater than Otto cycle

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The heating of gas at constant volume is governed by

Boyle's law

Charles' law

Gay-Lussac law

Avogadro's law

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The door of a running refrigerator inside a room was left open. Which of the following statements is correct?

The room will be cooled to the temperature inside the refrigerator

The room will be cooled very slightly

The room will be gradually warmed up

The temperature of the air in room will remain unaffected

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Which of the following is the extensive property of a thermodynamic system?

Pressure

Volume

Temperature

Density

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Which of the following is an intensive property of a thermodynamic system?

Mass

Temperature

Energy

Volume

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According to Avogadro's law, for a given pressure and temperature, each molecule of a gas

Occupies same volume

Occupies volume proportional to its specific weight

Occupies volume inversely proportional to its molecular weight

Occupies volume inversely proportional to its specific weight

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The energy of molecular motion appears as

Heat

Potential energy

Surface tension

Friction

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A perpetual motion machine is

A thermodynamic machine

A non-thermodynamic machine

A hypothetical machine

A hypothetical machine whose operation would violate the laws of thermodynamics