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Engineering Thermodynamics

Engineering Thermodynamics
The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as

Molecule
Element
Atom
Compound

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Engineering Thermodynamics
The behavior of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

Boyle's law
Charles' law
Gay-Lussac law
All of the listed here

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Engineering Thermodynamics
A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is

84 kJ
30 kJ
54 kJ
114 kJ

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Engineering Thermodynamics
Universal gas constant is defined as equal to product of the molecular weight of the gas and

Specific heat at constant pressure
Gas constant
Ratio of two specific heats
Specific heat at constant volume

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Engineering Thermodynamics
A gas is compressed in a cylinder by a movable piston to a volume one half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be

30 Nm
3000 Nm
300 Nm
300,000 Nm

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Engineering Thermodynamics
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

Combustion is at constant volume
Heat rejection is lower
Maximum temperature is higher
Expansion and compression are isentropic

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