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Engineering Thermodynamics

Engineering Thermodynamics
The atomic mass of oxygen is

14
18
16
121

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Engineering Thermodynamics
Boyle's law i.e. pV = constant is applicable to gases under

All ranges of pressures
Steady change of pressures
High range of pressures
Only small range of pressures

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Engineering Thermodynamics
An adiabatic wall is one which

Permits thermal interaction
Prevents thermal interaction
Encourages thermal interaction
Discourages thermal interaction

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Engineering Thermodynamics
The fuel mostly used in steam boilers is

Non-coking bituminous coal
Peat
Coking bituminous coal
Brown coal

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Engineering Thermodynamics
The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

1 + (1/ rγ - 1)
1 + rγ - 1
1 - (1/ rγ - 1)
1 - rγ - 1

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Engineering Thermodynamics
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

Heat rejection is lower
Expansion and compression are isentropic
Combustion is at constant volume
Maximum temperature is higher

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