Engineering Thermodynamics
When the gas is cooled at constant pressure,

Its temperature increases but volume decreases
Both temperature and volume decreases
Both temperature and volume increases
Its volume increases but temperature decreases

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Engineering Thermodynamics
Zeroth law of thermodynamics

Deals with heat engines
Deals with reversibility and irreversibility of process
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

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Engineering Thermodynamics
Producer gas is obtained by

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

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