Metering Devices #10

What condition is the refrigerant in before it enters the metering device?

• a high pressure, high temperature saturated liquid

• a high pressure, low temperature saturated liquid

• a high pressure, high temperature subcooled liquid

• a low pressure, high temperature subcooled liquid

What is the definition of a flash gas?

• The rapid condensation of a refrigerant gas

• The rapid evaporation of a refrigerant liquid

• The rapid sublimation of a refrigerant liquid

• The rapid evaporation of a refrigerant gas

What component will help decrease flash gas?

• a heat exchanger

• an accumulator

• a filter dryer

• a liquid injecting valve

What are three common types of metering devices that are used in residential and light commercial air conditioning?

• TXV, AXV, and Low Side Float

• High side float, low side float, and capillary tube

• Low side float, piston type and AXV

• Capillary Tube, Piston Type, TXV

What controls the pressure drop of a capillary tube?

• The type and length of the tubing

• The outer diameter and type of tubing

• The length and the inner diameter of the tubing

• The inner diameter and outer diameter of the tubing

The tool used to cut capillary tube would be

• Hand snips

• Hack Saw

• Tube Cutter

• Triangular File

What are the operating pressures of a TXV?

• Spring Pressure, TXV inlet pressure, sensing bulb pressure

• TXV inlet pressure, TXV outlet pressure, and sensing bulb pressure

• Spring pressure, evaporator pressure, and sensing bulb pressure

• Spring pressure, TXV inlet pressure, and TXV outlet pressure

What is the purpose of the external equalizer on a TXV?

• To decrease the pressure drop across the TXV

• To increase the pressure drop across the TXV

• To drop the pressure across the evaporator

• To offset for the pressure drop across the evaporator

The external equalizer line should be located

• next to the TXV sensing bulb

• 6"-8" upstream from the TXV sensing bulb

• 6"-8" downstream from the TXV sensing bulb

• none of the above

If a system using a TXV has a suction line of 3/4" diameter, where should the sensing bulb be placed?

• at the 4 o'clock and 8 o'clock position

• at the 12 o'clock position

• at the 6 o'clock position

• at either the 6 o'clock or 12 o'clock position