Thermodynamic Systems Worksheet

What is true about the dashed line process in the diagram?

• It is an irreversible process where the system isn’t in equilibrium throughout the process.

• It is a reversible process where the system is always in equilibrium.

• It represents a process with constant temperature.

• It represents a process with constant pressure.

What is a key characteristic of an irreversible compression process?

• The system remains in equilibrium throughout the process.

• The pressure and specific volume are well-defined during compression.

• The system is not in equilibrium, and the density of gas particles is non-uniform.

• The process requires less energy input than a reversible process.

What happens when the internal force on the piston is greater than the external applied forces in a piston-cylinder device?

• The piston moves inward and the system is compressed

• The piston does not move and there is no work

• The piston moves outward and the system expands

• The temperature of the system decreases

In an adiabatic process for a closed system, what is the value of heat transfer (Q)?

• Q = +

• Q = -

• Q = 0

• Q = ∞

Why will the course focus only on closed systems in the next couple of units?

• Because closed systems are simpler to analyze

• Because open systems do not follow the first law of thermodynamics

• Because closed systems allow for the analysis of only internal energy changes

• Because the course will not cover energy transfer at all

A table is shown with nine possible closed system energy transfers, categorized by compression, isometric, and expansion processes, and by heat addition, adiabatic, and heat rejection conditions. Each cell shows the relationship between Q, W, and the change in internal energy. What does this table represent?

• A diagram of a Carnot cycle

• A table of thermodynamic properties for water

• A table summarizing nine possible closed system energy transfers

• A graph of pressure versus volume

What is the process called when heat transfer is zero?

• Isothermal

• Adiabatic

• Isobaric

• Isochoric

What does the process of compression indicate about the change in volume (ΔV)?

• ΔV is positive

• ΔV is zero

• ΔV is negative

• ΔV cannot be determined

Which statement best describes the relationship between the signs of heat and work in thermodynamics?

• The signs of heat and work are always the same.

• The signs of heat and work are independent of one another.

• A positive heat in always means a positive work out.

• The signs of heat and work must always be negative together.

In the process of compression with heat addition, what is the sign of the work (W) done by the system?

• Negative

• Positive

• Zero

• Cannot be determined