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.
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).
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
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