Thermodynamics ASEN 2002- Exam 1
A pressure cooker containing liquid water increases the pressure in the cooker to 2 atm. The temperature at which water boils at 2 atm must be less that the boiling temperature at 1 atm.
False
A set of properties that completely describes the condition of a system describes its state. A system is said to be undergoing a steady-flow process if its properties change linearly with time.
False
All substances expand upon freezing-like water
False
Heat is transferred by ONLY two mechanisms: conduction and convection.
False
Kinetic and potential energy are the only contributing energies to the mechanical energy of a flowing fluid.
False
Neither mass nor energy may cross the boundary of a closed system. Both mass and energy may cross the boundary of an open system.
False
Power accounts for the time rate of energy change due to work. Therefore the SI units are Joules.
False
At the point that heat transfer stops, two bodies in contact are said to have reached thermal equilibrium.
True
Dry air can be considered a pure substance even though it is a mixture of several gases, because it has a uniform composition.
True
Energy transport by mass entering and leaving the system applies to control volumes.
True
English units require the use of variable constants to describe the relationship between units, for example, to represent length
True
Heat transfer determines the rate by which energy can be transferred from one system to another due to a temperature difference.
True
Intensive properties are those that are independent of the mass of the system. Extensive properties are those whose values depend on the size-or extent-of the system. An example of an intensive property is density.
True
Latent heat of vaporization is equivalent to the energy released during condensation.
True
Property diagram are used to illustrate changes in state due to a process.
True
Sublimation is the process by which a solid transitions directly to the gas phase.
True
The conservation of energy principle states that during an interaction, energy can change from one form to another but the total amount of energy remains constant.
True
The first law of thermodynamics is concerned with the NET change of the total energy (delta E) of the system and is equal to the difference between the amounts of energy transferred in and out of the system
True
The only two forms of energy interaction associated with a closed system are heat transfer and work.
True
The saturated liquid-vapor mixture state is a two-phase state where the substance as a liquid and a vapor co-exist in equilibrium.
True
The total energy of a system can be determined by the summation of internal, kinetic, and potential energies of the system, with a change in the total energy of a stationary system equal to its change in internal energy.
True
The triple line is where a substance exists in all three phases. The states on the triple line of a substance have the same pressure and temperature but different specific volume.
True
Work and heat transfer are not properties of the system. Therefore, work and heat are, in general, dependent on the process path.
True
Work can generally be considered as energy transfer associated with a force acting through a distance.
True
A compressed liquid state is characterized by higher pressures than its saturation pressure for a given temperature. Such that P>Psat at a given T.
True
A quasi-equilibrium process is one that in passing through states the departure from thermodynamic equilibrium to infinitesimal.
True
A simple compressible system is completely specified by two independent, intensive properties.
True
An adiabatic process is one in which heat transfer is zero.
True
An energy interaction is heat transfer if its driving force is a temperature difference.
True
