Engineering Thermodynamics
When the expansion or compression takes place according to the law pvn = C, the process is known as

Isothermal process
Adiabatic process
Hyperbolic process
Polytropic process

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Engineering Thermodynamics
Which of the following is the correct statement?

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

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Engineering Thermodynamics
First law of thermodynamics

All of these
Does not enable to determine change in entropy
Provides relationship between heat, work and internal energy
Enables to determine change in internal energy of the system

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Engineering Thermodynamics
Producer gas is obtained by

Carbonization of bituminous coal
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

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