Engineering Thermodynamics
Producer 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
Carbonization of bituminous coal

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Engineering Thermodynamics
Which of the following is the correct statement?

All the reversible and irreversible engines have the same efficiency.
All the reversible engines have the same efficiency.
Irreversible engines have maximum efficiency.
All engines are designed as reversible in order to obtain maximum efficiency.

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Engineering Thermodynamics
Zeroth law of thermodynamics

Deals with heat engines
Deals with conversion of mass and energy
States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
Deals with reversibility and irreversibility of process

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