Thermodynamics is Energy of Science

Thermo final. truefalse questions.

100 cards   |   Total Attempts: 188
  

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Cards In This Set

Front Back
πœ‚π‘‘β„Ž,π‘Ÿπ‘’π‘£ is always greater than πœ‚π‘‘β„Ž
True
The boundary work associated with a constant volume system is always greater than 0.
False. By looking at he P-v diagram there is no area under the curve which means it =0.
During a steady flow process, the amount of mass entering a control volume is always greater than the amount of mass leaving the control volume.
The mass, volume, and total energy content E of the control volume remains constant.
During a steady flow process Δ𝐸=0.
True.
𝑆𝑔𝑒𝑛 >0 πΌπ‘Ÿπ‘Ÿπ‘’π‘£π‘’π‘Ÿπ‘ π‘–π‘π‘™π‘’
=0 π‘…π‘’π‘£π‘’π‘Ÿπ‘ π‘–π‘π‘™π‘’
<0 πΌπ‘šπ‘π‘œπ‘ π‘ π‘–π‘π‘™π‘’
True.
Boundary work in a piston-cylinder device only exists in a closed system
True
Cp and Cv can be assumed constant for gases only.
False
Justification: Cp and Cv are only constant for solids and liquids. When looking at the
change in entropy, the similarities with their equations show that they are practically
equal.
A typical motorcycle engine is an example of a two-stroke process
True
Based on the first law alone, if a process can proceed in one direction, it can
also proceed in the opposite.
True
An isentropic process can be stated as a reversible adiabatic process, but a
reversible adiabatic is not necessarily isentropic.
False
Justification: A reversible adiabatic process is indeed isentropic, and an isentropic
process is not necessarily reversible and adiabatic.
The change in entropy for an actual adiabatic process is zero.
False: The change in entropy is zero for isentropic (adiabatic, reversible) processes but actual processes are not reversible and can’t be isentropic.
Ideal gas specific heats of monatomic gases remain constant over the entire temperature range.
True
Flow work is the work required to push a mass into or out of a control volume.
True
Real processes can be restored to their original state only if the net heat and net work exchanges between the system and the surroundings is zero.
False: Reversible processes do not occur in nature, they are idealized actual processes
The entropy change of a system during a process is equal to the net entropy transfer through the system boundary.
False: Second law of thermodynamics states that entropy can only be created and the entropy change of a system is equal to the entropy transfer combined with the entropy generated.