Exercise: Thermodynamics

Questions for: Thermodynamics

A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
A:
30 kJ
B:
54 kJ
C:
84 kJ
D:
114 kJ
Answer: B
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The free expansion process is __________ non-flow process.
A:
reversible
B:
irreversible
C:
D:
Answer: B
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Liquid fuels have higher calorific value than solid fuels.
A:
Yes
B:
No
C:
D:
Answer: A
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Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
A:
combustion is at constant volume
B:
expansion and compression are isentropic
C:
maximum temperature is higher
D:
heat rejection is lower
Answer: D
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The heating and expanding of a gas is called thermodynamic system.
A:
Yes
B:
No
C:
D:
Answer: B
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