Engineering Thermodynamics
Mond gas is obtained by

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

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

All the processes, taking place in the cycle of operation, must be extremely slow
All of these
The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
The working parts of the engine must be friction free

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Engineering Thermodynamics
According to First law of thermodynamics,

Total energy of a system remains constant
Work-done by a system is equal to the heat transferred by the system
Total internal energy of a system during a process remains constant
Internal energy, enthalpy and entropy during a process remain constant

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