Thermo true or false
The SI units for mass flow rate are kg/(m^2s)
False
The ideal gas law can be applied to compressed liquid states.
False
A two-phase state is where two phases of a pure substance co-exist in equilibrium
True
In the ideal-gas model specific internal energy and specific enthalpy of the gas are dependent only on temperature.
True
One dimensional flow assumes all intensive properties are uniform with position over each inlet or exit are of the control volume.
True
The compressibility factor Z exceeding a value of 1 accounts for deviation from idea-gas behavior.
True
The specific heat is defined as the energy required to raise the temperature of a unit mass of a substance by one degree.
True
The triple line on the P-v-T diagram is where all three phases exist in equilibrium.
True
The value of cp is always greater than cv for an gas
True
At steady state and for a single exit and single inlet, the mass flow rate at the exit equals the mass flow rate at the inlet. Therefore, the volumetric flow rate at the exit and the inlet must be equal
False
For an ideal gas undergoing a polytropic process, the exponent (n) having a value equal to the specific heat ratio corresponds to an isothermal process
False
Heat transfer INTO the system is considered positive. An adiabatic process is only when heat is transferred OUT of the system
False
In a closed system, any energy transfer driven by a temperature difference is called heat transfer. There are only two modes of heat transfer, conduction and convection.
False
In the liquid-vapor mixture region a state for a simple compressible system can be specified by (P,T)
False
Intensive properties are those that are independent of the size 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 Volume
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
The quality x is an intensive properties defined only for saturated mixture states. It is defined as x = mvapor/mtotal where 0<x<1. A value x=1 indicates a saturated liquid state and x = 0 a saturated vapor state.
False
The term WORK denotes a means whereby energy is transferred and NOT what is transferred. The SI unit for Work is [Joules/second]
False
The universal gas constant applies to only a few specific types of gas
False
Enthalpy is a property of the system that equals the sum of internal energy, U, and the product of pressure, p, and volume, V.
True
Equivalent units for specific heat are kJ/(kg C)
True
Expansion and compression of a gas in a closed piston-cylinder system is a form of work. A decrease in the system volume results in negative work.
True
For a control volume at steady state every property is independent of time
True
For a fixed mass, the properties of an ideal gas at two different states are related to each other by P1V1/T1 = P2V2/T2, where V is volume
True
For a simple compressible system, only two independent intensive properties are needed to describe the system.
True
For nozzles and diffusers the only work is flow work
True
In control volumes, the conservation of energy equation is often expressed as a rate equation due to the need to account for the rates of transfer of internal, kinetic, and potential energy of the entering and exiting streams.
True
The uncertainty of a measurement should be near the same order of magnitude (decimal place) as the last significant figure, for example, 92.8 + or - 0.3 m/s
True
The values of u (specific internal energy) and h ( specific enthalpy) are not determined by direct measurement but are calculated from measurable quantities using relations between thermodynamic properties.
True
Thermodynamic definition of work states that work is done by a system on its surroundings if the sole effect on everything external to the system could have been the raising of a weight.
True
When analyzing compressors and turbines, one can generally assume the heat transfer is small relative to shaft work (unless there in intentional cooling)
True
Work and Heat Transfer are processes. Therefore, work and heat are dependent on the process path.
True
The work associated with pushing the fluid into or out of the control volume is wflow = Pv (flow work or flow energy). It is automatically incorporated into the enthalpy h= u +Pv, indicating that enthalpy does not exits for a system without flow work
False
Thermal systems involve the storage, transfer, conversion and destruction of energy
False
Is this statement complete: " Water boils at 100 degrees Celsius", Yes or No.
No
A control volume (CV), or open system, must account for energy transfer by work and heat and energy accompanying mass as it enters and exits.
True
A polytropic process is associated with the expansion or compression process of a gas for which the pressure and volume are related. An example is the relation PV^n = C, where n and C are constants.
True
A pyrometer is an instrument to measure temperature of an object by sensing its thermal radiation.
True
A quasi-equilibrium process is one that in passing through states the departure from thermodynamic equilibrium is infinitesimal.
True
A set of properties that completely describes the condition of a system describes its state. A system is said to be in steady state if none of its properties changes with time.
True
Analysis of thermal systems uses, directly or indirectly, one or more of the four basic laws: conservation of mass, energy and momentum , and the second law of thermodynamics
True
Devices that transfer energy between fluids at different temperatures by heat transfer modes are called heat exchangers.
True
During a thermodynamic cycle, the change in energy can be nonzero but there is no net change in energy upon completing the cycle.
True
During steady state operation, the net rate of work (i.e. power) must equal the net rate of heat transfer.
True
In thermodynamics the term pressure refers to atmospheric pressure, unless explicitly stated otherwise.
True
Properties of v, u, and h for liquids and solids can be well approximated by using saturated liquid data at a given temperature
True
The Kelvin and Rankine temperature scales are thermodynamic temperature scales and the Celsius and Fahrenheit scares are two-point scales. Thus, absolute zero on the Rankine scale coincides with absolute zero of the Kelvin scale.
True
The first law of thermodynamics is concerned with the net change of the total energy deltaE of the system and can be written symbolically as deltaE = Q -W
True
The only mode of energy transfer by work that can occur for a simple compressible system to undergo quasi-equilibrium process is compression or expansion work.
True
