Refrigeration Quiz SLO2

The compressor operates continuously with which type of system controls?

• Orifice tube

• POA system

• EPR system

• Both B and C

Technician A says that heat is measured in degrees. Technician B says that temperature is measured in degrees. Which technician is correct?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

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

• Copper type hose

• Rigid hose

• Barrier hose

• Flexible, porous hose

It is 90°F in the shop and the humidity is high. What pressure will be shown on the high side pressure gauge (AC system on)?

• At least 350 psi

• 10 to 50 psi

• 40 to 140 psi

• 210 to 290 psi

Normal air conditioning system operation should result in what dash vent temperature during an A/C performance test?

• Below 32 degrees F (0 degrees C)

• Same or lower than ambient

• Between 68 and 72 degrees F (20 and 22 degrees C)

• 35 to 45 degrees F (2 to 7 degrees C)

Technician A says AC system lines and hoses that are cold have lower refrigerant pressure than warmer lines and hoses. Technician B says frost on a system component usually indicates a refrigerant leak in that area. Which technician is correct?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

Technician A checks ambient temperature as part of an AC performance test. Technician B says that if the AC compressor has not been operating, the high side and low side refrigerant pressure should be equal. Who is correct?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

An air conditioning performance check requires a ________.

• thermometer and a vacuum pump

• thermometer and a manifold gauge set

• manifold gauge set and a volt-ohm meter

• thermometer and hydrometer

Technician A says that oily residue on hoses, components, or fittings indicates an area where refrigerant may be leaking. Technician B says that clogged evaporator fins may cause inefficient air conditioning operation at all blower speeds. Which technician is correct?

• Technician A only

• Technician B only

• Both technicians

• Neither technician

What should the pressures of the low-side and high-side A/C system read on a gauge set with the engine off?

• The high side should be about 200 PSI with the engine off

• The low side should be at or near 0 PSI with the engine off

• The high side should be about 20% lower than the high-side pressure

• The same