Engineering Thermodynamics
Otto cycle is also known as

Constant volume cycle
Constant temperature cycle
Constant pressure cycle
Constant temperature and pressure cycle

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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 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
The universal gas constant (or molar constant) of a gas is the product of

Molecular mass of the gas and the specific heat at constant pressure
Molecular mass of the gas and the gas constant
Molecular mass of the gas and the specific heat at constant volume
Atomic mass of the gas and the gas constant

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