ARO 4011-Quiz 1
A substance that has a fixed chemical composition throughout is called an ideal substance.
FALSE
All three phases of a substance coexist in equilibrium at states along the triple line characterized by solid-line temperature and pressure.
FALSE
During a steady flow process, the fluid flows through the control volume steadily, experiencing some change with time at a fixed position
FALSE
Flow energy represents the molecular energy of a system and may exist in sensible, latent, chemical, and nuclear forms.
FALSE
For incompressible substances (liquids and solids0, both the constant pressure and constant-volume specific heats are not identical
FALSE
In the gas phase, a substance that is about to condense is called a superheated vapor
FALSE
The mass-dependent properties of a system are called intensive properties and the others are extensive properties
FALSE
The most common form of mechanical work is the boundary work, which is the work associated with the expansion and compression if substances.
I don't know
A system of fixed mass is called a closed system, or control mass, and a system that involves mass transfer across its boundaries is called an open system, or control volume.
TRUE
At a given pressure, a substance changes phase at a fixed temperature, called the saturation temperature
TRUE
Determining the rated of heat transfer to or from a system and thus the times of cooling or heating, as well as the variation of the temperature, is the subject of heat transfer.
TRUE
Energy can cross the boundaries of a closed system in the form of heat or work. For control volumes, energy can also be transported by mass.
TRUE
For ideal gases u, h, cv, and cp are functions of temperature alone
TRUE
Likewise at a given temperature, the pressure at which a substance changes phase is called the saturated pressure
TRUE
Most unsteady flow processes can be modeled as a uniform flow process, which requires that the fluid flow at any inlet or exit s uniform and steady, and thus the fluid properties do not change with time or position over the cross section of an inlet or exit
TRUE
On a P-V diagram, the area under the process curve represents the boundary work for a quasi-equilibrium process
TRUE
Real gases exhibit ideal gas behavior at relatively low pressure and high temperature
TRUE
The amount of energy needed to raise the temperature of a unit mass of a substance by one degree is called the specific heat at constant volume cv for a constant volume process, and the specific heat at constant pressure cp for a constant pressure process
TRUE
The conservation of mass principle states that the next mass transfer to or from a system during a process is equal to the net change (increase or decrease) in the total mass of the system during that process
TRUE
The first law of Thermodynamics is simply an expression of the conservation of energy principle, and it asserts that energy is a thermodynamic property.
TRUE
The second law of thermodynamics asserts that energy has quality as well as quantity, and actual processes occur in the direction of decreasing quality of energy.
TRUE
The state beyond which there is no distinct vaporization process is called the critical point
TRUE
The work required to push a unit mass of fluid into or out of a control volume is called flow work or flow energy
TRUE
Thermodynamics is the science that primarily deals with energy.
TRUE
When solving thermodynamics problems, it is recommended that the general form of the energy balance Ein - Eout = Delta E system be used for all problems, and simplify it for the particular problem instead of using the specific relations given here for different processes
TRUE
intensive properties
independent of the amount of substance present
