Which type of refrigerant hose is used with an R-134a system?

A) Barrier hose B) Rigid hose
C) Copper type hose D) Flexible, porous hose


A

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A piston-cylinder device contains a vapor-liquid equilibrium mixture of water at T=150 °C. The quality of the mixture is initially q=0.90 and the volume of the mixture is initially 1 m3. The vessel is compressed at constant T and P until the quality is q=0.3.

A) Determine the initial masses of the liquid and vapor phases. B) Determine the work required to complete the compression. C) Determine the change in enthalpy of the mixture.

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The value of DC field excitation required to achieve unity power factor is called ____________________ excitation.

Fill in the blank(s) with the appropriate word(s).

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Clear water is observed dripping out from beneath the evaporator. Technician A says that is normal. Technician B says that the evaporator housing is defective and should be replaced. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

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What type of compressors are most commonly used in rooftop packaged units?

A) Hermetic rotary and hermetic centrifugal compressors B) Semihermetic scroll or semihermetic rotary compressors C) Open-type centrifugal and open-type screw compressors D) Hermetic reciprocating or hermetic scroll compressors

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