What is galvanized iron pipe?

Iron pipe dipped in zinc to make it corrosion resistant

ACR copper tubing is:

Type L dehydrated copper tubing

In which way did Title VI Section 608 of the Clean Air Act additionally regulate technicians?

It required they hold a certification

What is a service valve wrench?

A ratchet wrench with square openings

The compound gauge reads:

Pressures above and below atmospheric pressure

Refrigerant oil flow through the liquid line is not a problem because:

The oil mixes well with the liquid refrigerant

What causes the pointer of a dial thermometer to move?

A coiled piece of metal with a hi rate of thermal expansion

Infrared thermometers measure temperature by:

Sensing infrared light being emitted by the object

What type of fastener is used to assemble metal ducts on a job site?

Self starting sheet metal screws

Positive shutoff fittings allow technicians to reduce the amount of:

Refrigerant spray while connecting or disconnecting hoses

What are right handed aviation snips used for?

Making cuts in sheet metal that curve left

Why is the Montreal Protocol significant?

It has the support of almost every country in the world

Why is it important to measure vacuum levels on the system?

To determine when evacuation is complete

What is considered a long line application for residential air conditioning?

Lines over 80' horizontal or 20' vertical rise

Soft copper tubing can be joined by:

Flaring, compression, soldering, and brazing

A flattened, curved tube that straightens under pressure

What is the purpose of oxygen and acetylene regulators?

To reduce tank pres. and maintain steady pres. to the torch

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AIRC 1010 Final Review VECTR

96 termsStudBud Administration144 plays

Flashcards96 cardsFPractice quizPHost liveL

Questions 96

Answers

1
Hard copper tubing can be joined by:
Flaring, soldering, brazing, and compression
Compression fittings only
Soldering and brazing
Flaring only
2
Most air conditioner manufacturers specify that refrigerant lines be:
Brazed
Welded
Soldered
Glued
3
What is galvanized iron pipe?
Iron pipe that has been Teflon coated
This is not a real product
Just another name for iron pipe
Iron pipe dipped in zinc to make it corrosion resistant
4
ACR copper tubing is:
A special high strength copper alloy
Type L dehydrated copper tubing
Any copper tubing that has been dehydrated
Type M dehydrated copper tubing
5
Galvanized iron pipe has been dipped in molten zinc to make it:
Heat resistant
Corrosion resistant
Water proof
Shiny
6
What color hose connects to the low side of the system?
Yellow
Black
Blue
Red
7
In which way did Title VI Section 608 of the Clean Air Act additionally regulate technicians?
It banned disposal of ozone depleting units
It limited their ability to repair most systems
It repealed bans on venting refigerant
It required they hold a certification
8
What is a service valve wrench?
Any pliers used to turn a service valve stem
A ratchet wrench with square openings
A wrench used to install service valves
A tool used to change Schrader valve cores
9
What material is used for refrigerant piping in heating, A/C, and refrigeration systems?
Galvanized iron pipe
Aluminum tubing
Copper
Iron pipe
10
The compound gauge reads:
Pressures below atmospheric pressure
Both low and high side system pressure simultaneously
Pressures above and below atmospheric pressure
Pressures above atmospheric pressure
11
If pressurized oxygen is mixed with refrigerant oil what will occur?
A new element will be created
An explosion
Toxic gases may be released
Nothing
12
Why are copper fittings cleaned before soldering or brazing?
To enhance their appearance
To make the pipe to fitting junction easier to see
To remove oxides
To create clearance so the pipe will slide into the fitting
13
How are duct staples different than regular staples?
They are serrated to provide better grip
The tips are bent outwards
They are hardened to pierce the metal duct
Officemax does not sell them
14
At what temperature does brazing take place?
Above 1,800 degrees Fahrenheit
Below 400 degrees Fahrenheit
Above 840 degrees Fahrenheit
Below 840 degrees Fahrenheit
15
Refrigerant oil flow through the liquid line is not a problem because:
There is never oil present in the liquid line
The liquid line is always piped downhill
The oil mixes well with the liquid refrigerant
The oil and refrigerant do not mix and share the line space
16
What causes the pointer of a dial thermometer to move?
A set of gears driven by a heat motor
A coiled piece of metal with a hi rate of thermal expansion
The pointer is attracted to magnetic north
Pressure from the vaporization of a fluid
17
ACR is a Type L copper that has been:
Cryogenically treated
Annealed
Dehydrated
Polished
18
What is the maximum pressure reading on a typical R-22 high pressure gauge?
350 psig
500 psig
120 psig
800 psig
19
What material is most commonly used for air conditioning drain lines?
PVC
Aluminum tubing
CPVC
Copper tubing
20
Types of copper tubing in order of wall thickness from thin to thick are:
L, M, K
K, L, M
L, K, M
M, L, K
21
What type of tool is used to loosen the set screw on fan blade hubs?
Allen wrench
Torch
Hacksaw
Adjustable wrench
22
Infrared thermometers measure temperature by:
Sensing the ultraviolet light emitted by the object
Sensing infrared light being emitted by the object
Sensing the speed of sonar waves leaving the object
Using Bluetooth technology
23
The flattened metal tube that moves the dial on a pressure gauge is called:
Diaphragm
C gauge
Bellows
Bourdon tube
24
What type of fastener is used to assemble metal ducts on a job site?
Self starting sheet metal screws
Nails
Rivets
Wood screws
25
Positive shutoff fittings allow technicians to reduce the amount of:
The amount of refrigerant flowing through the hoses
Refrigerant spray while connecting or disconnecting hoses
Liquid in the unit during evacuation
Time spent on a service call
26
Which type of thermometer cannot be used to take air temperature readings?
Digital
Dial
Infrared
Glass stem
27
What is the maximum reading on a typical R-410a high pressure gauge?
500 psig
300 psig
800 psig
120 psig
28
What is the most common hazard encountered when installing or removing refrigeration gauges?
Electrocution
Frostbite
Poisoning
Asphyxiation
29
The low side gauge is called:
A vacuum gauge
A high pressure gauge
A compound gauge
A cold gauge
30
The preferred tool for cutting PVC pipe is:
Tubing shear
Hacksaw
Pocket knife
Shredder
31
What are right handed aviation snips used for?
Making long, straight cuts in sheet metal
Making cuts in sheet metal that curve right
Making cuts in sheet metal that curve left
Cutting sheet metal in any direction
32
Pointed, self threading, round tipped, and self drilling are all types of:
Rivets
Sheetmetal screws
Bolts
Wood screws
33
Why is the Montreal Protocol significant?
It has the support of almost every country in the world
It led to a complete ban of all ozone depleting chemicals
It does not require government action to achieve its goals
All its goals have been met
34
What type of head is the most common for screws on units?
Square head
Allen head
Round head
Hex head
35
Why is it important to measure vacuum levels on the system?
To determine when evacuation is complete
To determine when there is no more air
To determine when evacuation has started
To determine when there is no more moisture
36
A tool used for checking system pressure, evacuating, and recovering is:
Recovery cylinder
Vacuum pump
Digital thermometer
Gauge manifold
37
If a tech needs to read refrigerant pressure in a window unit, he must:
Backseat crack the compressor service valve
Cut open the process stub on the compressor
Use a hose with a valve core depressor
Use a piercing valve
38
Slightly opening a valve is called:
Cracking the valve
Breaking the valve
Testing the valve
Hedging the valve
39
What is the maximum safe fill level for a refillable refrigerant cylinder?
75%
100%
90%
80%
40
Who may refill DOT 39 nonrefillable cylinders?
The DOT
Only EPA certified technicians
Anyone
Nobody
41
The recovery level for a system with less than 200 lbs of R-22 is:
17 mm absolute pressure
0 psig
4 in Hg vacuum
10 in Hg vacuum
42
What is considered a long line application for residential air conditioning?
Air conditioning lines can run any length necessary
Lines over 100' horizontal or 50' vertical rise
Lines over 80' horizontal or 20' vertical rise
Lines over 50' horizontal or 10' vertical rise
43
Type I certification applies to:
MVACs
Small appliances
Low pressure systems
Large systems
44
Soft copper tubing can be joined by:
Only flaring
Only soldering and brazing
Flaring, compression, soldering, and brazing
Only compression
45
A Bourdon tube is:
A twisted tube that untwists under pressure
A flattened, curved tube that straightens under pressure
A sphere that deforms under pressure
A vacuum tube that vibrates under pressure
46
Skin exposed to streams of liquid refrigerant can receive:
Mild tingling
Convulsions
A burn from the subzero liquid
A cookie
47
Who can legally refill a DOT 39 nonrefillable cylinder?
Enterprising polar bears
Only certified technicians
Only the refrigerant manufacturer
Nobody
48
What is the purpose of oxygen and acetylene regulators?
To provide an automatic shutoff in an emergency
To boost tank pressures to the torch tip
To reduce tank pres. and maintain steady pres. to the torch
To make torch operation more convenient
49
When connecting a gauge manifold set the air in the hoses should be:
Is removed by evacuating the entire system
Is negligible and wont affect the system
Removed by purging
Is neutralized by adding a special chemical
50
Asphyxiation may occur from breathing in refrigerant as it is heavier than air and will:
Displace air in the room
Create carbon monoxide fumes
Settle at the ceiling
Release nitrogen into the room
51
Refrigerant removed in any condition and stored without processing in any way is:
Reclaimed
Virgin
Recovered
Recycled
52
What PPE should be worn when handling sheet metal?
Chain mail chaps
Gloves
None, if you're man enough
A respirator
53
What is considered a good vacuum level for a deep vacuum?
15,000 microns
28 inches Hg vacuum
500 microns
1,000 microns
54
Which is the most reliable and inexpensive thermometer used by technicians?
Infrared
Dial
Glass stem
Digital
55
Refrigerant piping must be able to adequately carry both refrigerant and:
Electricity
Oil
Nitrogen
Oxygen
56
When the hand wheel on the gauge manifold are turned counterclockwise:
No pressure reading will show on the gauges
Refrigerant cannot flow between outer hoses and inner hose
Is the only position where the gauges will read pressure
Refrigerant can flow between outer hoses and the inner hose
57
The preferred method of cutting copper pipe for a refrigeration system is:
A cutting torch
A hacksaw
A tubing cutter
A circular saw
58
The temperature measurement of air leaving the diffusers is called:
Supply air temperature
Return air temperature
Approach temperature
Ambient air temperature
59
Besides improving efficiency insulating the suction:
Prevents stray electrical current from shocking the tech
Reduces vibrations from the compressor
Prevents moisture from condensing on the line
Serves as a backup seal in case the copper is punctured
60
The purpose of evacuating a refrigeration system is to:
Remove harmful refrigerant oil
Remove noncondensable gases
Remove noncondensable gases and moisture
Remove moisture
61
What controls when Schrader valves open and close?
They open when hoses with depressors are connected to them
A Bluetooth signal controls them
They open when the unit starts and close when it shuts down
They open when backseat cracked
62
To remove the burr left from the pipe cutter you should use:
A truck
A vise
A torch
A reamer
63
It has been illegal to vent ozone depleting substances from equipment since:
July 1st, 1992
November 15th, 1993
November 14th, 1994
November 15th, 1995
64
How should you heat a copper joint while brazing?
Melt the brazing rod, then heat the joint
Heat the joint first, then the pipe
Heat all parts equally
Heat the pipe first, then the joint
65
The temperature measurement of the air entering the air intake grille is called:
Return air temperature, RAT
Approach temperature
Supply air temperature, SAT
Ambient air temperature
66
What material is used for natural gas piping?
Iron pipe
Galvanized pipe
Aluminum pipe
Copper
67
The correct lighting procedure for an oxyacetylene torch is:
Crack oxygen, light, add acetylene
Fully open oxygen and acetylene, wait 10 sec, light
Crack acetylene, light, add oxygen
Crack oxygen and acetylene, light
68
How does an ultrasonic leak detector work?
It hears the high pitched sound of escaping gas
It sees disturbance in the air of escaping gas
It uses Bluetooth technology
It uses sonar to look for defects in the pipe
69
What is the maximum safe storage temperature for refrigerant cylinders?
125 degrees Fahrenheit
175 degrees Fahrenheit
100 degrees Fahrenheit
150 degrees Fahrenheit
70
The difference between soldering and brazing is that:
Brazing never requires flux
Soldering occurs at a higher temperature
Brazing occurs at a higher temperature
Brazing melts the base metal
71
How often do refillable refrigerant cylinders need to be inspected?
Every 5 years
Every year
Only when they are first made
Every 10 years
72
The EPA requires repair of refrigerant leaks:
Only in systems using a HFC refrigerant
In all systems
Only in systems using a CFC refrigerant
Only in systems with a charge over 50 lbs
73
Bare skin exposed to liquid refrigerant will:
Feel like a burn and blister up
Easily withstand 30 seconds of exposure before damage
Harden instantly and be prone to shattering
Tingle, but not receive serious injury
74
What is the nominal size of piping or tubing?
Outside diameter
Approximate inside diameter
Wall thickness
Exact inside diameter
75
The most accurate dimension on tubing is:
The average of inside and outside diameters
Wall thickness
Outside diameter
Inside diameter
76
The solder should be melted by the:
A separate torch just for melting the solder
Pipe
Torch
At the same time as preheating the pipe
77
The international agreement that established dates for phaseout of ozone depleting chemicals:
PBACC (Polar Bears Against Climate Change)
Montreal Protocol
UN Accord
International EPA Consortium
78
What is the maximum reading on a typical R-22 compound gauge?
500 psig
350 psig
120 psig
800 psig
79
Copper tubing that comes in rigid, straight lengths is called:
Soft copper
ACR copper
Hard copper
Tempered copper
80
What types of system access valves do residential air conditioning systems usually have?
A process stub on the compressor
Schrader valves on the compressor suction and discharge line
Schrader valves on the suction and liquid lines
Service valves on liquid receiver and suction accumulator
81
The possible fine for violating the Clean Air Act is:
Life imprisonment
Community service cleaning the polar bear exhibit at the zoo
$37,500
$10,000
82
Releases of refrigerant from connecting and disconnecting hoses:
Make the polar bears sad
Are permissible under EPA regulations
Must be prevented
Are punishable under a reduced penalty clause
83
Which end of a refrigeration hose has a Schrader valve core depressor?
Both ends
The straight end
The angled end
Neither end
84
Which torch type would be the best choice for a brazing project?
Air-fuel torch
Oxyacetylene
Air-MAPP swirl tip
Air-propane swirl tip
85
Which is used for piping natural gas?
Black iron
Copper
CPVC
Galvanized iron
86
What type of detector should be used when looking for a refrigerant leak in a closed space?
Electronic sight glass
Fluorescent dye
Ultrasonic
Electronic
87
What tool is used to remove the hex head machine screws in equipment panels?
Nut driver
Phillips head screwdriver
Locking pliers
Adjustable wrench
88
Why are split system installation valves not used after installation?
They do not control the flow of refrig to the service ports
They are stuck open
Split systems do not have installation valves
They are stuck closed
89
Why should pliers not be used to tighten nuts and bolts?
They will round off the corners
Most technicians don't have pliers in their tool bag
They will strip the threads
They will overtighten the nut
90
Electrical pliers can be used to cut what?
Live high voltage electrical transmission lines
Copper wire
Whatever will fit into the jaws
Nails
91
How does reclaimed refrigerant differ from recovered or recycled refrigerants?
It can be reused
It cannot be reused
It cannot be put back into the same system
It can be put into new systems
92
Which type of thermometer can take the temperature of an object without physically touching it?
Dial
Infrared
Digital
Glass stem
93
What color hose is used for connecting to the charging refrigerant cylinder?
Blue
Red
Yellow
White
94
Why should you never force a nut, bolt, or screw when it does not fit correctly?
You can cross thread the part and strip the threads
The part could become discolored
You could drop the part and lose it in the bushes
You could undermine the parts intended strength
95
What PPE should always be worn when handling refrigerant?
A respirator and gloves
Only safety glasses
Gloves and safety glasses
Only gloves
96
What is the purpose of purging with nitrogen while brazing?
To leak check while brazing, saving time
To prevent oxide formation inside the pipe
To make the torch burn hotter
To blow oxides of the pipe walls

AIRC 1010 Final Review VECTR Flashcards | StudBud

AIRC 1010 Final Review VECTR

96 termsStudBud Administration144 plays

AIRC 1010 Final Review VECTR

Flashcards96 cardsFPractice quizPHost liveL

Questions 96

Answers

1
Hard copper tubing can be joined by:
Flaring, soldering, brazing, and compression
Compression fittings only
Soldering and brazing
Flaring only
2
Most air conditioner manufacturers specify that refrigerant lines be:
Brazed
Welded
Soldered
Glued
3
What is galvanized iron pipe?
Iron pipe that has been Teflon coated
This is not a real product
Just another name for iron pipe
Iron pipe dipped in zinc to make it corrosion resistant
4
ACR copper tubing is:
A special high strength copper alloy
Type L dehydrated copper tubing
Any copper tubing that has been dehydrated
Type M dehydrated copper tubing
5
Galvanized iron pipe has been dipped in molten zinc to make it:
Heat resistant
Corrosion resistant
Water proof
Shiny
6
What color hose connects to the low side of the system?
Yellow
Black
Blue
Red
7
In which way did Title VI Section 608 of the Clean Air Act additionally regulate technicians?
It banned disposal of ozone depleting units
It limited their ability to repair most systems
It repealed bans on venting refigerant
It required they hold a certification
8
What is a service valve wrench?
Any pliers used to turn a service valve stem
A ratchet wrench with square openings
A wrench used to install service valves
A tool used to change Schrader valve cores
9
What material is used for refrigerant piping in heating, A/C, and refrigeration systems?
Galvanized iron pipe
Aluminum tubing
Copper
Iron pipe
10
The compound gauge reads:
Pressures below atmospheric pressure
Both low and high side system pressure simultaneously
Pressures above and below atmospheric pressure
Pressures above atmospheric pressure
11
If pressurized oxygen is mixed with refrigerant oil what will occur?
A new element will be created
An explosion
Toxic gases may be released
Nothing
12
Why are copper fittings cleaned before soldering or brazing?
To enhance their appearance
To make the pipe to fitting junction easier to see
To remove oxides
To create clearance so the pipe will slide into the fitting
13
How are duct staples different than regular staples?
They are serrated to provide better grip
The tips are bent outwards
They are hardened to pierce the metal duct
Officemax does not sell them
14
At what temperature does brazing take place?
Above 1,800 degrees Fahrenheit
Below 400 degrees Fahrenheit
Above 840 degrees Fahrenheit
Below 840 degrees Fahrenheit
15
Refrigerant oil flow through the liquid line is not a problem because:
There is never oil present in the liquid line
The liquid line is always piped downhill
The oil mixes well with the liquid refrigerant
The oil and refrigerant do not mix and share the line space
16
What causes the pointer of a dial thermometer to move?
A set of gears driven by a heat motor
A coiled piece of metal with a hi rate of thermal expansion
The pointer is attracted to magnetic north
Pressure from the vaporization of a fluid
17
ACR is a Type L copper that has been:
Cryogenically treated
Annealed
Dehydrated
Polished
18
What is the maximum pressure reading on a typical R-22 high pressure gauge?
350 psig
500 psig
120 psig
800 psig
19
What material is most commonly used for air conditioning drain lines?
PVC
Aluminum tubing
CPVC
Copper tubing
20
Types of copper tubing in order of wall thickness from thin to thick are:
L, M, K
K, L, M
L, K, M
M, L, K
21
What type of tool is used to loosen the set screw on fan blade hubs?
Allen wrench
Torch
Hacksaw
Adjustable wrench
22
Infrared thermometers measure temperature by:
Sensing the ultraviolet light emitted by the object
Sensing infrared light being emitted by the object
Sensing the speed of sonar waves leaving the object
Using Bluetooth technology
23
The flattened metal tube that moves the dial on a pressure gauge is called:
Diaphragm
C gauge
Bellows
Bourdon tube
24
What type of fastener is used to assemble metal ducts on a job site?
Self starting sheet metal screws
Nails
Rivets
Wood screws
25
Positive shutoff fittings allow technicians to reduce the amount of:
The amount of refrigerant flowing through the hoses
Refrigerant spray while connecting or disconnecting hoses
Liquid in the unit during evacuation
Time spent on a service call
26
Which type of thermometer cannot be used to take air temperature readings?
Digital
Dial
Infrared
Glass stem
27
What is the maximum reading on a typical R-410a high pressure gauge?
500 psig
300 psig
800 psig
120 psig
28
What is the most common hazard encountered when installing or removing refrigeration gauges?
Electrocution
Frostbite
Poisoning
Asphyxiation
29
The low side gauge is called:
A vacuum gauge
A high pressure gauge
A compound gauge
A cold gauge
30
The preferred tool for cutting PVC pipe is:
Tubing shear
Hacksaw
Pocket knife
Shredder
31
What are right handed aviation snips used for?
Making long, straight cuts in sheet metal
Making cuts in sheet metal that curve right
Making cuts in sheet metal that curve left
Cutting sheet metal in any direction
32
Pointed, self threading, round tipped, and self drilling are all types of:
Rivets
Sheetmetal screws
Bolts
Wood screws
33
Why is the Montreal Protocol significant?
It has the support of almost every country in the world
It led to a complete ban of all ozone depleting chemicals
It does not require government action to achieve its goals
All its goals have been met
34
What type of head is the most common for screws on units?
Square head
Allen head
Round head
Hex head
35
Why is it important to measure vacuum levels on the system?
To determine when evacuation is complete
To determine when there is no more air
To determine when evacuation has started
To determine when there is no more moisture
36
A tool used for checking system pressure, evacuating, and recovering is:
Recovery cylinder
Vacuum pump
Digital thermometer
Gauge manifold
37
If a tech needs to read refrigerant pressure in a window unit, he must:
Backseat crack the compressor service valve
Cut open the process stub on the compressor
Use a hose with a valve core depressor
Use a piercing valve
38
Slightly opening a valve is called:
Cracking the valve
Breaking the valve
Testing the valve
Hedging the valve
39
What is the maximum safe fill level for a refillable refrigerant cylinder?
75%
100%
90%
80%
40
Who may refill DOT 39 nonrefillable cylinders?
The DOT
Only EPA certified technicians
Anyone
Nobody
41
The recovery level for a system with less than 200 lbs of R-22 is:
17 mm absolute pressure
0 psig
4 in Hg vacuum
10 in Hg vacuum
42
What is considered a long line application for residential air conditioning?
Air conditioning lines can run any length necessary
Lines over 100' horizontal or 50' vertical rise
Lines over 80' horizontal or 20' vertical rise
Lines over 50' horizontal or 10' vertical rise
43
Type I certification applies to:
MVACs
Small appliances
Low pressure systems
Large systems
44
Soft copper tubing can be joined by:
Only flaring
Only soldering and brazing
Flaring, compression, soldering, and brazing
Only compression
45
A Bourdon tube is:
A twisted tube that untwists under pressure
A flattened, curved tube that straightens under pressure
A sphere that deforms under pressure
A vacuum tube that vibrates under pressure
46
Skin exposed to streams of liquid refrigerant can receive:
Mild tingling
Convulsions
A burn from the subzero liquid
A cookie
47
Who can legally refill a DOT 39 nonrefillable cylinder?
Enterprising polar bears
Only certified technicians
Only the refrigerant manufacturer
Nobody
48
What is the purpose of oxygen and acetylene regulators?
To provide an automatic shutoff in an emergency
To boost tank pressures to the torch tip
To reduce tank pres. and maintain steady pres. to the torch
To make torch operation more convenient
49
When connecting a gauge manifold set the air in the hoses should be:
Is removed by evacuating the entire system
Is negligible and wont affect the system
Removed by purging
Is neutralized by adding a special chemical
50
Asphyxiation may occur from breathing in refrigerant as it is heavier than air and will:
Displace air in the room
Create carbon monoxide fumes
Settle at the ceiling
Release nitrogen into the room
51
Refrigerant removed in any condition and stored without processing in any way is:
Reclaimed
Virgin
Recovered
Recycled
52
What PPE should be worn when handling sheet metal?
Chain mail chaps
Gloves
None, if you're man enough
A respirator
53
What is considered a good vacuum level for a deep vacuum?
15,000 microns
28 inches Hg vacuum
500 microns
1,000 microns
54
Which is the most reliable and inexpensive thermometer used by technicians?
Infrared
Dial
Glass stem
Digital
55
Refrigerant piping must be able to adequately carry both refrigerant and:
Electricity
Oil
Nitrogen
Oxygen
56
When the hand wheel on the gauge manifold are turned counterclockwise:
No pressure reading will show on the gauges
Refrigerant cannot flow between outer hoses and inner hose
Is the only position where the gauges will read pressure
Refrigerant can flow between outer hoses and the inner hose
57
The preferred method of cutting copper pipe for a refrigeration system is:
A cutting torch
A hacksaw
A tubing cutter
A circular saw
58
The temperature measurement of air leaving the diffusers is called:
Supply air temperature
Return air temperature
Approach temperature
Ambient air temperature
59
Besides improving efficiency insulating the suction:
Prevents stray electrical current from shocking the tech
Reduces vibrations from the compressor
Prevents moisture from condensing on the line
Serves as a backup seal in case the copper is punctured
60
The purpose of evacuating a refrigeration system is to:
Remove harmful refrigerant oil
Remove noncondensable gases
Remove noncondensable gases and moisture
Remove moisture
61
What controls when Schrader valves open and close?
They open when hoses with depressors are connected to them
A Bluetooth signal controls them
They open when the unit starts and close when it shuts down
They open when backseat cracked
62
To remove the burr left from the pipe cutter you should use:
A truck
A vise
A torch
A reamer
63
It has been illegal to vent ozone depleting substances from equipment since:
July 1st, 1992
November 15th, 1993
November 14th, 1994
November 15th, 1995
64
How should you heat a copper joint while brazing?
Melt the brazing rod, then heat the joint
Heat the joint first, then the pipe
Heat all parts equally
Heat the pipe first, then the joint
65
The temperature measurement of the air entering the air intake grille is called:
Return air temperature, RAT
Approach temperature
Supply air temperature, SAT
Ambient air temperature
66
What material is used for natural gas piping?
Iron pipe
Galvanized pipe
Aluminum pipe
Copper
67
The correct lighting procedure for an oxyacetylene torch is:
Crack oxygen, light, add acetylene
Fully open oxygen and acetylene, wait 10 sec, light
Crack acetylene, light, add oxygen
Crack oxygen and acetylene, light
68
How does an ultrasonic leak detector work?
It hears the high pitched sound of escaping gas
It sees disturbance in the air of escaping gas
It uses Bluetooth technology
It uses sonar to look for defects in the pipe
69
What is the maximum safe storage temperature for refrigerant cylinders?
125 degrees Fahrenheit
175 degrees Fahrenheit
100 degrees Fahrenheit
150 degrees Fahrenheit
70
The difference between soldering and brazing is that:
Brazing never requires flux
Soldering occurs at a higher temperature
Brazing occurs at a higher temperature
Brazing melts the base metal
71
How often do refillable refrigerant cylinders need to be inspected?
Every 5 years
Every year
Only when they are first made
Every 10 years
72
The EPA requires repair of refrigerant leaks:
Only in systems using a HFC refrigerant
In all systems
Only in systems using a CFC refrigerant
Only in systems with a charge over 50 lbs
73
Bare skin exposed to liquid refrigerant will:
Feel like a burn and blister up
Easily withstand 30 seconds of exposure before damage
Harden instantly and be prone to shattering
Tingle, but not receive serious injury
74
What is the nominal size of piping or tubing?
Outside diameter
Approximate inside diameter
Wall thickness
Exact inside diameter
75
The most accurate dimension on tubing is:
The average of inside and outside diameters
Wall thickness
Outside diameter
Inside diameter
76
The solder should be melted by the:
A separate torch just for melting the solder
Pipe
Torch
At the same time as preheating the pipe
77
The international agreement that established dates for phaseout of ozone depleting chemicals:
PBACC (Polar Bears Against Climate Change)
Montreal Protocol
UN Accord
International EPA Consortium
78
What is the maximum reading on a typical R-22 compound gauge?
500 psig
350 psig
120 psig
800 psig
79
Copper tubing that comes in rigid, straight lengths is called:
Soft copper
ACR copper
Hard copper
Tempered copper
80
What types of system access valves do residential air conditioning systems usually have?
A process stub on the compressor
Schrader valves on the compressor suction and discharge line
Schrader valves on the suction and liquid lines
Service valves on liquid receiver and suction accumulator
81
The possible fine for violating the Clean Air Act is:
Life imprisonment
Community service cleaning the polar bear exhibit at the zoo
$37,500
$10,000
82
Releases of refrigerant from connecting and disconnecting hoses:
Make the polar bears sad
Are permissible under EPA regulations
Must be prevented
Are punishable under a reduced penalty clause
83
Which end of a refrigeration hose has a Schrader valve core depressor?
Both ends
The straight end
The angled end
Neither end
84
Which torch type would be the best choice for a brazing project?
Air-fuel torch
Oxyacetylene
Air-MAPP swirl tip
Air-propane swirl tip
85
Which is used for piping natural gas?
Black iron
Copper
CPVC
Galvanized iron
86
What type of detector should be used when looking for a refrigerant leak in a closed space?
Electronic sight glass
Fluorescent dye
Ultrasonic
Electronic
87
What tool is used to remove the hex head machine screws in equipment panels?
Nut driver
Phillips head screwdriver
Locking pliers
Adjustable wrench
88
Why are split system installation valves not used after installation?
They do not control the flow of refrig to the service ports
They are stuck open
Split systems do not have installation valves
They are stuck closed
89
Why should pliers not be used to tighten nuts and bolts?
They will round off the corners
Most technicians don't have pliers in their tool bag
They will strip the threads
They will overtighten the nut
90
Electrical pliers can be used to cut what?
Live high voltage electrical transmission lines
Copper wire
Whatever will fit into the jaws
Nails
91
How does reclaimed refrigerant differ from recovered or recycled refrigerants?
It can be reused
It cannot be reused
It cannot be put back into the same system
It can be put into new systems
92
Which type of thermometer can take the temperature of an object without physically touching it?
Dial
Infrared
Digital
Glass stem
93
What color hose is used for connecting to the charging refrigerant cylinder?
Blue
Red
Yellow
White
94
Why should you never force a nut, bolt, or screw when it does not fit correctly?
You can cross thread the part and strip the threads
The part could become discolored
You could drop the part and lose it in the bushes
You could undermine the parts intended strength
95
What PPE should always be worn when handling refrigerant?
A respirator and gloves
Only safety glasses
Gloves and safety glasses
Only gloves
96
What is the purpose of purging with nitrogen while brazing?
To leak check while brazing, saving time
To prevent oxide formation inside the pipe
To make the torch burn hotter
To blow oxides of the pipe walls