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Engineering Thermodynamics

Engineering Thermodynamics
The unit of pressure in S.I. units is

Dyne per square cm
Pascal
mm of water column
kg/cm²

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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

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

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Engineering Thermodynamics
First law of thermodynamics furnishes the relationship between

Various thermodynamic processes
Heat and work
Heat, work and properties of the system
Various properties of the system

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Engineering Thermodynamics
Barometric pressure is equal to

735.6 mm Hg
760 mm Hg
Zero mm Hg
1 mm Hg

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Engineering Thermodynamics
For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)

P v = constant, if T is kept constant
T/P = constant, if v is kept constant
V/T = constant, if p is kept constant
P/T = constant, if v is kept constant

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Engineering Thermodynamics
Work done in a free expansion process is

Maximum
Positive
Minimum
Zero

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MORE MCQ ON Engineering Thermodynamics

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