Thermo true or false

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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


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