Engineering Thermodynamics
Which is the incorrect statement about Carnot cycle?

It is used as the alternate standard of comparison of all heat engines
All the heat engines are based on Carnot cycle
All of these
It provides concept of maximising work output between the two temperature limits

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Engineering Thermodynamics
Producer gas is obtained by

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
Carbonization of bituminous coal
Passing steam over incandescent coke

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