unit 45

Question 1

The typical temperature inside the fresh-food compartment in a domestic refrigerator is

Answer 1

35°F to 40°F.

Question 2

The operating condition for the single compressor in a household refrigerator is the lowest box temperature, which is typically

Answer 2

0°F

Question 3

When the air temperature in a domestic freezer is 0°F, the plate-type evaporator temperature may be as low as

Answer 3

212°F.

Question 4

Typical head pressures should correspond to a condensing temperature ________°F higher than room temperature at design operating conditions.

Answer 4

20°F to 35

Question 5

Frost accumulates on the evaporators of forced-draft refrigerators because:

Answer 5

they are low-temperature appliances.

Question 6

When unfrozen product is placed in the freezer compartment of a domestic refrigerator/freezer, the product

Answer 6

will freeze slowly and large ice crystals will likely form.

Question 7

The compressors used in domestic appliances typically range in size from

Answer 7

1/10 horsepower to 1/3 horsepower.

Question 8

The flow through the capillary tube metering device is determined by the

Answer 8

inside (bore) diameter and the length of the tubing

Question 9

A manual defrost system is most likely to be found on what type of system?

Answer 9

An appliance with a natural-draft evaporator

Question 10

The capillary tube metering device is often fastened where to improve heat exchange and system performance?

Answer 10

suction line

Question 11

The doors of domestic appliances are typically removed when the appliance is disposed of to prevent

Answer 11

someone from getting trapped inside the appliance.

Question 12

Condensers in domestic refrigerators and freezers are

Answer 12

air cooled

Question 13

What is the name given to the heaters that are located around the doors of the appliance to prevent sweating?

Answer 13

Mullion heaters

Question 14

Which of the following statements is true regarding the interior surfaces of most refrigerators and freezers?

Answer 14

They are made of plastic, are easy to clean, and can become brittle when cold.

Question 15

The adjustment device used for low atmospheric pressure conditions is called the

Answer 15

altitude thermostatic adjustment control.

Question 16

The ice-making process in a domestic freezer is typically controlled by

Answer 16

time

Question 17

Depending on the type of condenser, the condenser saturation temperature for a domestic appliance located in a cool, 65°F room will likely be between

Answer 17

85°F and 95°F

Question 18

When should gauges be installed on a domestic refrigerator or freezer?

Answer 18

Only when absolutely necessary

Question 19

A dirty condenser coil on a domestic refrigerator will cause the

Answer 19

appliance’s operating pressures to rise.

Question 20

Forced-draft evaporators are characterized as being

Answer 20

physically small with large quantities of air moving through them.

Question 21

The type of compressor typically found on a domestic appliance is

Answer 21

welded, hermetic.

Question 22

On a domestic appliance with a mechanical draft condenser,

Answer 22

the compressor cycles on and off with the condenser fan motor.

Question 23

The door switch on a domestic appliance controls the operation of the

Answer 23

evaporator fan motor.

Question 24

The stand-alone freezer may be configured as either __________ type.

Answer 24

upright or chest

Question 25

The typical domestic refrigerated box has two outside doors that are configured as __________ styles.

Answer 25

under and over or side-by-side

Question 26

The evaporators in household refrigerators can be of two types, _________.

Answer 26

natural draft or mechanical draft

Question 27

T/F
The household refrigerator must maintain two different compartments at two different temperatures with a single compressor.

Answer 27

true

Question 28

Forced-draft evaporators are normally made of ___________.

Answer 28

aluminum tubing with fins

Question 29

The fins of an evaporator on a domestic refrigerator are spaced widely apart to___________.

Answer 29

allow frost to build up and not block the airflow

Question 30

Two common methods for defrosting refrigerator evaporator coils are _______________.

Answer 30

manual and automatic

Question 31

Ideally, a home freezer operates with a box temperature of about ____°F

Answer 31

0

Question 32

T/F
A typical domestic ice maker produces between 10 and 12 pounds of ice a day, depending on the model.

Answer 32

false

Question 33

A refrigerator thermostat is also referred to as a __________.

Answer 33

cold control