Deck 45: Domestic Refrigerators and Freezers

Question 1

The adjustment device used for low atmospheric pressure conditions is called the thermostat ____ adjustment control.

A) PTC
B) current relay
C) altitude
D) mullion

Answer 1

C

Question 2

When performing a repair on an aluminum evaporator, the best solution is to use an acetylene torch in conjunction with phos-copper brazing rods.

Answer 2

False

Question 3

The condensate from the evaporator coil is disposed of by evaporation using heat from the discharge line or ____.

A) heated air from the condenser
B) air from the evaporator fan
C) electric heater in the drain pan
D) heat from the compressor fins

Answer 3

A

Question 4

The temperature of the fresh food compartment of a domestic refrigerator is ____.

A) 20-35°F
B) 50-60°F
C) 30-50°F
D) 35-40°F

Question 5

An accumulator at the outlet of the evaporator is there to ____.

A) accumulate moisture in the system to reduce frost formation
B) allow the evaporator to operate as full as possible with liquid refrigerant
C) provide space for refrigerant vapor to collect
D) accumulate foreign particles and other contaminants

Question 6

The best tool for defrosting an evaporator coil is a knife.

Question 7

When a suction line filter/drier is added to the refrigerant circuit, the additional amount of refrigerant required is ignored.

Question 8

The heaters located near the refrigerator door to keep the cabinet from sweating are called the ____ heaters.

A) defrost cycle
B) mullion or panel
C) condensate
D) re-cycle

Question 9

On a domestic refrigerator equipped with a defrost cycle that depends on the run time of the compressor, what starts the defrost cycle?

A) Cooling thermostat.
B) Compressor.
C) Defrost timer.
D) Door switch.

Question 10

A household refrigerator may have more than one evaporator coil.

Question 11

The purpose of door gaskets on a domestic refrigerator is to keep the noise level down when the door is closed.

Question 12

The capillary tube metering device on a domestic refrigerator is generally fastened to the ____ for heat exchange.

A) liquid line
B) compressor discharge line
C) condenser coil
D) suction line

Question 13

The refrigerant charge in a domestic refrigerator amounts usually to only a few ____.

A) ounces
B) pounds
C) grains
D) microns

Question 14

What two functions does the evaporator of a domestic refrigerator perform?

A) Filters and cools the air.
B) Absorbs and dissipates heat.
C) Humidifies and cools the air.
D) Dehumidifies and cools the air.

Question 15

The type of condenser that a domestic refrigerator uses can be a(n) ____ condenser.

A) static
B) induced-draft
C) hot wall
D) All of the above.

Question 16

One sure-fire way to determine if the system is operating with less than a full charge of refrigerant is to evaluate the ____.

A) cooling thermostat setting
B) evaporator superheat
C) nitrogen pressure
D) defrost timer

Question 17

The plastic in the freezer compartment is at very low temperatures and, as a result, is quite ____.

A) clean
B) fragile
C) soft
D) ductile

Question 18

The defrost timer motor operates independently of the compressor motor.

Question 19

When installing a line tap valve on the high-pressure side of the system, it is best to install it on the compressor process tube.

Question 20

Which of the following represents the vacuum level that should be achieved on a domestic refrigerator before charging?

A) Low.
B) Deep.
C) Moderate.
D) Very low.

Question 21

To repair a leak in an aluminum evaporator a special epoxy product may be applied to the hole while the unit is in a slight ____________________.

Question 22

If the suction line and compressor are sweating, what is the problem?

Question 23

A current magnetic relay is often used to assist in the starting of the compressor, but most new appliances use a(n) ____________________ device.

Question 24

How is the water from the melting frost removed during an automatic defrost?

Question 25

How is the crisper maintained slightly cooler than the main storage area of the refrigerator?

Question 26

The expansion device commonly found on domestic refrigerators is the ____________________.

Question 27

Why should sharp objects not be used to chip away ice from an evaporator?

Question 28

Explain what is needed to properly replace a compressor in a domestic refrigerator or freezer, since visual identification of lines may be difficult.

Question 29

What are the two reasons for fastening the capillary tube to the suction line?

Question 30

What is the first indication that a refrigerator is running low on refrigerant charge?

Question 31

The operating pressure of the condenser in a domestic refrigerator will increase as the temperature of the room ____________________.

Question 32

The process of changing from a solid to a vapor is known as ____________________.

Question 33

The typical box temperature for a stand-alone freezer is about ____________________ºF.

Question 34

The most common type of compressor housing used in a domestic refrigerator is the ____________________ type.

Question 35

How is manual defrost accomplished?