1010 Final

Question 1

Enlarging one end of copper tubing so that another piece of the same size will fit inside

Answer 1

Swaging

Question 2

This tool is used to open and close a service valve

Answer 2

Service wrench

Question 3

Place the service valve in this position for a gauge reading

Answer 3

Cracked

Question 4

Color code for HCFC 22

Answer 4

Green

Question 5

A mixture of refrigerants that has its own refrigerant properties

Answer 5

Azeotrope

Question 6

Color code for CFC 12

Answer 6

White

Question 7

Approximate melting point (solidus) of 95/five solder

Answer 7

+450 F

Question 8

This component rejects heat in the refrigeration cycle

Answer 8

Condenser

Question 9

Place the service valve in this position to remove the gauge hose

Answer 9

Back seated

Question 10

Color code for HFC 134a

Answer 10

Light blue

Question 11

Place the service valves in this position to isolate the compressor

Answer 11

Front seated

Question 12

This component absorbs heat in the refrigeration cycle

Answer 12

Evaporator

Question 13

This component is used to meter the flow of refrigerant

Answer 13

TEV or TXV

Question 14

This component pumps the refrigerant vapor thru a refrigeration system

Answer 14

Compressor

Question 15

This component holds excess refrigerant in a refrigeration system

Answer 15

Receiver

Question 16

These two tools can be used to bend soft copper tubing

Answer 16

Lever type and spring type

Question 17

The approximate melting point of a 15% silver brazing rod

Answer 17

1200 F

Question 18

This causes solder to be pulled into a “tight” joint

Answer 18

Capillary action

Question 19

This component is used to control the delivery pressure from oxygen, nitrogen, and acetylene tanks

Answer 19

Regulator

Question 20

This is the most sensitive leak detector

Answer 20

Electronic

Question 21

The approximate boiling temperature of R-12 at atmospheric pressure

Answer 21

-21.6

Question 22

The approximate boiling temperature of R-22 at atmospheric pressure

Answer 22

-41.4

Question 23

The approximate boiling temperature of R-502 at atmospheric pressure

Answer 23

-50.1

Question 24

The approximate boiling temperature of R-11 at atmospheric pressure

Answer 24

+74.8

Question 25

This leak detector is difficult to use outside on bright sunlight or windy conditions

Answer 25

Halide torch

Question 26

The term used when a vacuum pump is used to remove non-condensables from a refrigeration system

Answer 26

Evacuate

Question 27

To read operating pressures, the gauge manifold handles should be

Answer 27

Closed

Question 28

Refrigeration copper tubing is sized by

Answer 28

Outside diameter (OD)

Question 29

List five desirable characteristics of refrigerant

Answer 29

Colorless, odorless, non toxic, non flammable, and non corrosive

Question 30

What classification or type of copper tubing is required in refrigeration and air conditioning applications

Answer 30

K and L

Question 31

Why is necessary to seal the ends of copper tubing when it is not in use

Answer 31

Keep out non condensables

Question 32

Name five methods used to join or connect copper tubing

Answer 32

Swage, flare, pinch, constriction, manufactured fitting

Question 33

What is the term used to describe the drawing of solder into a close fitting joint

Answer 33

Capillary action

Question 34

Oxygen is usually set to a higher delivery pressure than acetylene when operating a torch

Answer 34

True

Question 35

No danger will result when oxygen and oil are present under pressure

Answer 35

False

Question 36

How can copper oxide be eliminated from the inner walls of copper tubing joint when brazing

Answer 36

Nitrogen

Question 37

What material is used to help soft solder stick to copper

Answer 37

Flux

Question 38

When would a flare connection be preferred to a solder connection

Answer 38

When easy disassembly is needed

Question 39

What is the approximate melting point of 95/5 solder

Answer 39

+450 F

Question 40

What is the approximate melting point of 15% silver braze

Answer 40

+1200 F

Question 41

What is the metal content of 95/5 solder

Answer 41

95% tin / 5% antimony