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Engineering Thermodynamics

Engineering Thermodynamics
Which of the following is the extensive property of a thermodynamic system?

Density
Volume
Pressure
Temperature

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Engineering Thermodynamics
Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?

O₂, N₂, H₂, air
O₂, N₂, water vapour
SO₂, NH₃, CO₂, moisture
O₂, N₂, steam, CO₂

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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

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

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Engineering Thermodynamics
The polytropic index (n) is given by

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

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Engineering Thermodynamics
For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.

None of these
Equal to
Greater than
Less than

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Engineering Thermodynamics
If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be

40°C
0°C
20°C
80°C

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