Engineering Thermodynamics
The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will

Remain unchanged
Increase
Decrease
Increase/decrease depending on application

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can

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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
Mond gas is obtained by

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

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