1020 Final

Question 1

To read system pressure the service valves are placed in the ________ position.

Answer 1

Back seated

Example sentence: Make sure the service valves are back seated before checking the system pressure.

Question 2

The ________ rejects heat in the refrigeration cycle.

Answer 2

Condenser

Example sentence: The condenser is responsible for rejecting heat in the refrigeration cycle.

Question 3

The _______ absorbs heat in the refrigeration cycle.

Answer 3

Evaporator

Example sentence: The evaporator absorbs heat in the refrigeration cycle.

Question 4

The condenser performs three functions when operating properly. Name these functions in the order in which they occur.

Answer 4

Desuperheating

Condense

Subcooling

Example sentence: The condenser first desuperheats, then condenses, and finally subcools the refrigerant.

Question 5

The purpose of the TEV is to maintain a nearly constant _________ with varying loads on the evaporator.

Answer 5

Superheat

Example sentence: The TEV helps maintain a nearly constant superheat in the evaporator with changing loads.

Question 6

The TEV sensing bulb is connected to the ________ of the evaporator coil.

Answer 6

Outlet

Example sentence: The TEV sensing bulb is connected to the outlet of the evaporator coil for accurate temperature control.

Question 7

An increase in superheat causes the pressure on top of the TEV’s diaphragm to:

Answer 7

Increase

Example sentence: When superheat increases, the pressure on top of the TEV’s diaphragm also increases.

Question 8

Which type of system is considered a critical charge?

Answer 8

Cap tube

Example sentence: A cap tube system is considered a critical charge system.

Question 9

A pump down procedure is started when the ________ valve is front seated.

Answer 9

Liquid line

Example sentence: The pump down procedure begins when the liquid line valve is front seated.

Question 10

The receiver is located in the:

Answer 10

Liquid line

Example sentence: The receiver is typically located in the liquid line of a refrigeration system.

Question 11

To accurately measure a deep vacuum you would use:

Answer 11

Vacuum gauge

Example sentence: Use a vacuum gauge to accurately measure a deep vacuum in the system.

Question 12

Vapor refrigerant is added to an operating system thru the:

Answer 12

Suction line

Example sentence: Vapor refrigerant is added to the system through the suction line.

Question 13

The most accurate method of charging a self-contained system (refrigerator, window unit) is?

Answer 13

Weigh-in

Example sentence: The most accurate method for charging a self-contained system is by weighing in the refrigerant.

Question 14

The term evacuation refers to?

Answer 14

Using a vacuum pump

Example sentence: Evacuation in refrigeration refers to using a vacuum pump to remove air and moisture from the system.

Question 15

A fan cycle control on the condenser motor is used to:

Answer 15

Raise head pressure in cold weather

Example sentence: The fan cycle control on the condenser motor is used to increase head pressure during cold weather conditions.

Question 16

A refrigerator system holds 8 pounds and 12 ounces of refrigerant cylinder weighs 34 pounds and 5 ounces. How much should the cylinder weigh after the system is properly charged?

Answer 16

25 pounds and 9 ounces

Example sentence: After properly charging the system, the cylinder should weigh 25 pounds and 9 ounces.

Question 17

A R134A system is operating with a low side pressure of 24 psig and a high side pressure of 140 psig. The suction line temperature in 35F and liquid line temperature of 95F. What is the superheat?

Answer 17

9F

Example sentence: With the given pressures and temperatures, the superheat is calculated to be 9F.

Question 18

When liquid charging the refrigeration system should be ________ and liquid refrigerant should be charged in to the ___________.

Answer 18

ON;suction line

Question 19

What would happen to the high pressure if the condenser fan motor will not operate?

Answer 19

Increase

Example sentence: If the condenser fan motor fails to operate, the high pressure in the system will increase.

Question 20

What would happen to compressor amperage draw with an increase in load pressure?

Answer 20

Increase

Example sentence: As the load pressure increases, the compressor’s amperage draw will also increase.

Question 21

What happens to the superheat with a dirty evaporator?

Answer 21

Increase

Example sentence: A dirty evaporator will cause an increase in superheat in the system.

Question 22

There are two places in a system that divide the low and high side. One is the valves in the compressor and the second one is the ___________

Answer 22

Expansion device

Example sentence: The expansion device is one of the components that divide the low and high side in a refrigeration system.