Engineering Thermodynamics
Which of the following statement is correct according to Clausis statement of second law of thermodynamics?

It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
None of these

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Engineering Thermodynamics
Mond gas is obtained by

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

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