Domestic Refrigeration

While carrying out repairs, you notice a split in the cable exposing a live conductor. You should:

• wrap insulation tape around the exposed part

• leave it alone

• tell the client

• replace it

Static fin and tube condensers are sometimes called:

• forced draft condensers

• natural draft condensers

• fan cooled condensers

• evaporative condensers

To reduce the risk of the domestic finned tube evaporator becoming blocked with ice, the evaporator is designed with:

• a close fin spacing

• thick plate surface

• wide fin spacing

• thick heavy duty fins

In a domestic freezer, instead of electric mullion heaters, hot gas lines are often diverted from the compressor to:

• increase the cooling effect in the freezer

• stop condensation formation around doors

• give a quicker defrost in the freezer

• increase the off cycle in the refrigerator

Non-condensables such as air cause problems in a domestic refrigeration system. One of these is:

• a reduction in the life of the compressor

• an increase in head pressure

• decontamination of oil in the system

• a lower suction pressure and temperature

The most common refrigerant metering device in domestic refrigeration is the:

• low side float

• T.X valve

• suction line accumulator

• capillary tube

Systems with capillary tubes used as a metering devices are more suitable for evaporators with a:

• heavy load

• light load

• constant load

• fluctuating load

The reason that the accumulator is located at the end of the evaporator is to prevent:

• high current draw on start up

• oil slugging in the evaporator

• flood back

• a build up of refrigerant in the condenser

The capillary tube is designed to equal the:

• capacity of the condenser

• pumping capacity of the compressor

• total capacity of the evaporator and the condenser

• total capacity of the evaporator and the compressor

The reason a filter drier is installed immediately before the capillary tube is to:

• prevent hot gas entering the evaporator

• control the amount of refrigerant entering the capillary tube

• prevent oil and moisture entering the capillary tube

• create a pressure drop to aid the capillary