THERMO-FLUIDS-PARTICLE-HAM Flashcards
A chemical reaction has the following thermodynamic data: positive enthalpy change, positive entropy
change, positive gibbs free energy change. What can you deduce from the given thermodynamic data?
the reaction is endothermic and non-spontaneous
What is stopping us from directly observing the implications of the third law of thermodynamics?
It is impossible to reach absolute zero temperature.
Which is not a state function?
Work
In a T-v diagram for a pure substance, the horizontal part of the isotherms indicate
specific volume range of a mixture of saturated liquid and saturated vapor
Which of the following is true regarding the third law of thermodynamics?
The entropy of a perfectly crystalline substance approaches a negative value as its temperature approaches absolute zero.
Thermal equilibrium is achieved when 2 or more bodies in contact with each other have the same temperatures.
The total entropy of the universe is either constant or constantly increasing.
The entropy of a non-crystalline substance approaches a constant value as its temperature approaches absolute zero.
none of the choices
The entropy of a non-crystalline substance approaches a constant value as its temperature
approaches absolute zero.
For a reactive chemical production process containing an recycle stream, what should be added to the
process to avoid the build-up of too much inert material in the process?
purge
What is the main purpose of reheat in the Rankine cycle?
to increase turbine and pump
efficiencies
Which of the following conditions for an air-water mixture at 1 atm contains the most amount of moisture?
absolute humidity of 0.03 g/g dry air
60℃ at 10% relative humidity
50℃ at 10% relative humidity
molal humidity of 0.056 mol/mol dry air
dew point of 20℃
molal humidity of 0.056 mol/mol dry air
Which of the following conditions for an air-water mixture at 1 atm contains the most amount of moisture?
dew point of 42℃
80℃ at 20% relative humidity
absolute humidity of 0.06 g/g dry air
all choices have the same moisture content
58℃ at 50% relative humidity
80℃ at 20% relative humidity
For an adiabatic, horizontal, converging nozzle in which an ideal gas in subsonic speed range flows
through, which of the following illustrates the correct relationships between inlet and outlet temperatures?
Tinlet > Toutlet
For laminar fluid flow through a packed bed (Re < 0.1), how does the pressure drop across the bed change when the superficial fluid velocity is halved? Assume all other p
decrease by a factor of 2
What factor leads to the decrease in settling velocity in hindered conditions?
interactions between particles
Under which circumstance can we assume that the resistance offered by the filter cake is negligible compared to that from the filter media?
batch pressure filtration
What is the hydraulic diameter of the annular region of two concentric coaxial pipes, with the diameter of the inner pipe as d and the diameter of the outer pipe as D?
D-d
A certain centrifugal pump can generate a head of H for a discharge of Q. If two of such pumps are connected in parallel, what would be the total discharge delivered by the system?
2Q
