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Engineering Thermodynamics

Engineering Thermodynamics
The polytropic index (n) is given by

log (v1/ v2)/ log (p1/p2)
log (p1p2)/log (v1v2)
log [(p1v1)/(p2v2)]
log (p2/ p1)/log (v1/ v2)

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Engineering Thermodynamics
The efficiency of Diesel cycle increases with

Constant cut-off
None of these
Decrease in cut-off
Increase in cut-off

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Engineering Thermodynamics
Which of the following is not the intensive property?

Pressure
Density
Heat
Temperature

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Engineering Thermodynamics
The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will

Remain unchanged
Decrease
Increase/decrease depending on application
Increase

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Engineering Thermodynamics
Superheated vapour behaves

As steam
Exactly as gas
Approximately as a gas
As ordinary vapour

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Engineering Thermodynamics
For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order

Diesel cycle, Otto cycle, Dual cycle
Otto cycle, Diesel cycle, Dual cycle
Dual cycle, Otto cycle, Diesel cycle
Dual cycle, Diesel cycle, Otto cycle

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