VCR and mixture review

What are the equipment that utilizes the Vapor-Compression Refrigeration Cycle?

• Heating stoves

• Air Conditioning

• Microwaves

• Refrigerators

Which of the following statements is CORRECT?

• In the VCR, the evaporator and condenser are heat exchangers.

• In the VCR, the evaporator operates at higher pressure than condenser.

• The Compressor condenses R134A vapor into saturated liquid

• Across the expansion valve, temperature of R134A remains constant.

Identify the stage where Isentropic Compression takes place in the VCR.

• 4-1

• 1-2

• 2-3

• 3-4

Which of the following assumptions to the First Law are true in the Condenser?

• ΔEk = ΔEp = Ws = 0

• ΔH = ΔEk = ΔEp = 0

• Ws = Q = ΔH = 0

• ΔEk = Q = ΔH goes to infinity

What is the purpose of the throttling device in the refrigeration cycle?

• To decrease temperature such that R134A becomes a refrigerant.

• To increase temperature such that R134A can vaporise to a saturated vapor

• To increase pressure such that R134A condenses into a liquid.

• To decrease pressure such that R134A becomes a sat. vapour/liquid mixture.

Which one of the following pair is not correct? i.e. (end of) stage - state of R134A

• Compressor - superheated Vapor

• Condenser - saturated liquid

• Throttling Valve - saturated vapor

• Evaporator - saturated vapor

What law states that the entropy of a pure perfect crystal is zero at 0 K?

• Third Law of Thermodynamics

• Second Law of Thermodynamics

• First Law of Thermodynamics

• Zeroth Law of Thermodynamics

What is the use of the Generalized Compressibility Chart in real gas behavior?

• To determine the compressibility factor Z for use in the ideal gas equation

• To determine the critical temperature of a substance

• To calculate the molar volume of a solution

• To find the Henry's Law constant for a solute

What parameter of an mixture can be used in the direct calculation of mixed properties such as Mmix, Pi, Cp,mix?

• specific enthalpy, h

• vapor mole fraction, y

• number of moles, n

• individual molecular weight, Mw

Which law describes the behavior of ideally dilute solutions?

• Boyle's Law

• Henry's Law

• Charles's Law

• Raoult's Law