Engineering Thermodynamics
A perpetual motion machine is

A hypothetical machine whose operation would violate the laws of thermodynamics
A hypothetical machine
A non-thermodynamic machine
A thermodynamic machine

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Engineering Thermodynamics
Mond gas is obtained by

Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 650°C
Carbonisation of bituminous coal

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Engineering Thermodynamics
A closed system is one in which

Mass does not cross boundaries of the system, though energy may do so
Neither mass nor energy crosses the boundaries of the system
Mass crosses the boundary but not the energy
Both energy and mass cross the boundaries of the system

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