Engineering Thermodynamics
The term N.T.P. stands for

Natural temperature and pressure
Nominal temperature and pressure
Normal thermodynamic practice
Normal temperature and pressure

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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
Carbonization of bituminous coal
Passing steam over incandescent coke
Passing air and a large amount of steam over waste coal at about 650°C

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