Exam 5: Refrigerant System Componentsservicing System Components

If a system has a thermostatic expansion valve,it will also have all of the following parts,EXCEPT:

Most early R-12 hoses were not barrier hoses.

Desiccant is being discussed.Technician A says both manufacturer-approved refrigerants use the same desiccant.Technician B says the desiccant in an accumulator can be replaced without replacing the accumulator.Who is correct?

Most vendors will not honor the warranty on a new or rebuilt compressor unless the ____ is replaced at the time of service.

Technician A says that the thermostatic expansion valve may be located anywhere between the evaporator outlet and the compressor inlet.Technician B says that fixed orifice tubes sizes are interchangeable in order to taylor system performance.Who is correct?

An H valve is often referred to as a block valve.

What is a barrier hose and when must one be used?

The compressor separates the low side from the high side of the system.

The refrigerant from a vehicles A/C system is being recovered into a recovery unit.Technician A says that both the vapor and liquid tank valves on the recovery unit should be OPEN.Technician B says that both the high-side and low-side gauge valves on the manifold and gauge set should be OPEN.Who is correct?

Removing spring lock fittings on refrigerant lines requires a special tool.

On an expansion valve system the valve opens and closes in relation to ______ temperature and pressure.

If the evaporator is starved,superheat is very high.

Tubing with a nylon lining can be used with both R-12 (CFC-12)and R-134a (HFC-134a)refrigerants.

Before installation: Technician A says that refrigerant system O-rings should be coated with new refrigerant oil.Technician B says refrigerant system O-rings can be coated with a gasket sealant.Who is correct?

Technician A says there are several condenser designs and flow paths in use today.Technician B says the only flow paths for refrigerant through the condenser's tubing is the parallel cross flow.Who is correct?

All of the following are reasons why a flooded evaporator will not cool well,EXCEPT:

A leaking evaporator is being replaced.Technician A says the new o-rings should be coated with clean refrigerant oil.Technician B says the some refrigerant oil shoud be added to the system prior to recharging the system.Who is correct?

O-rings will not usually leak if they are reused.

Why must the condenser outlet be at the bottom?

Technician A says a receiver-drier is used in systems with a fixed orifice tube.Technician B says the receiver-drier stores reserve refrigerant.Who is correct?