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HVAC 1005 & 1010 > 1010 Final > Flashcards

1010 Final Flashcards

1
Q

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

A

Swaging

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2
Q

This tool is used to open and close a service valve

A

Service wrench

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3
Q

Place the service valve in this position for a gauge reading

A

Cracked

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4
Q

Color code for HCFC 22

A

Green

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5
Q

A mixture of refrigerants that has its own refrigerant properties

A

Azeotrope

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6
Q

Color code for CFC 12

A

White

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7
Q

Approximate melting point (solidus) of 95/five solder

A

+450 F

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8
Q

This component rejects heat in the refrigeration cycle

A

Condenser

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9
Q

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

A

Back seated

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10
Q

Color code for HFC 134a

A

Light blue

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11
Q

Place the service valves in this position to isolate the compressor

A

Front seated

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12
Q

This component absorbs heat in the refrigeration cycle

A

Evaporator

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13
Q

This component is used to meter the flow of refrigerant

A

TEV or TXV

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14
Q

This component pumps the refrigerant vapor thru a refrigeration system

A

Compressor

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15
Q

This component holds excess refrigerant in a refrigeration system

A

Receiver

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16
Q

These two tools can be used to bend soft copper tubing

A

Lever type and spring type

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17
Q

The approximate melting point of a 15% silver brazing rod

A

1200 F

18
Q

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

A

Capillary action

19
Q

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

A

Regulator

20
Q

This is the most sensitive leak detector

A

Electronic

21
Q

The approximate boiling temperature of R-12 at atmospheric pressure

A

-21.6

22
Q

The approximate boiling temperature of R-22 at atmospheric pressure

A

-41.4

23
Q

The approximate boiling temperature of R-502 at atmospheric pressure

A

-50.1

24
Q

The approximate boiling temperature of R-11 at atmospheric pressure

A

+74.8

25
Q

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

A

Halide torch

26
Q

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

A

Evacuate

27
Q

To read operating pressures, the gauge manifold handles should be

A

Closed

28
Q

Refrigeration copper tubing is sized by

A

Outside diameter (OD)

29
Q

List five desirable characteristics of refrigerant

A

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

30
Q

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

A

K and L

31
Q

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

A

Keep out non condensables

32
Q

Name five methods used to join or connect copper tubing

A

Swage, flare, pinch, constriction, manufactured fitting

33
Q

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

A

Capillary action

34
Q

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

A

True

35
Q

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

A

False

36
Q

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

A

Nitrogen

37
Q

What material is used to help soft solder stick to copper

A

Flux

38
Q

When would a flare connection be preferred to a solder connection

A

When easy disassembly is needed

39
Q

What is the approximate melting point of 95/5 solder

A

+450 F

40
Q

What is the approximate melting point of 15% silver braze

A

+1200 F

41
Q

What is the metal content of 95/5 solder

A

95% tin / 5% antimony

HVAC 1005 & 1010 (12 decks)

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