75)
When the safety cap is removed from acetylene cylinders that hold 55 ft3 or more:
75)
A)
The cylinder must have a regulator installed on it.
B)
The cylinder must be chained to a cart or structure.
C)
The cylinder must be in a vertical position.
D)
The cylinder must be laying in a horizontal position.
Answer:
B
Explanation:
A)
B)
C)
D)
76)
76)
Why are used refrigerant oils NOT disposed of at an automotive oil recycler?
A)
Used refrigerant oil and used automotive oil are not compatible.
B)
Used refrigerant oil and used automotive oil can be mixed during disposal.
C)
Used refrigerant oil and used automotive oil are compatible.
D)
Used refrigerant oil and used automotive oil are interchangeable.
Answer:
A
Explanation:
A)
B)
C)
D)
77)
77)
How can you easily maintain SDS documents?
A)
Throw the SDSs into a box and put it in a closet
B)
Log all of the SDSs into a computer system
C)
Put SDSs into a manila envelope within the service vehicle
D)
Alphabetize the SDSs by active ingredient
Answer:
C
Explanation:
A)
B)
C)
D)
78)
78)
Why is safe driving a big part of HVACR job safety?
A)
Because many HVACR jobs involve driving to get to the job.
B)
You have to drive to get to work.
C)
There are not many other aspects of HVACR safety.
D)
Employers assume that safe drivers are smarter.
Answer:
A
Explanation:
A)
B)
C)
D)
21
79)
79)
One fire extinguisher in a work area is sufficient:
A)
If its capacity is large enough to handle a fire that could occur.
B)
Provided it is capable of extinguishing class A, B, C, and D fires.
C)
As long as it is the right class.
D)
When water is accessible in a work area.
Answer:
A
Explanation:
A)
B)
C)
D)
80)
80)
How can a confined space, such as a walk–in cooler or underground tunnel, become a safety
hazard?
A)
Cell phones do not receive service in confined spaces.
B)
The oxygen is limitedlong exposure can cause suffocation.
C)
Electricity flows more readily in a confined space.
D)
The nitrogen can combine with carbon dioxide to form a toxic gas.
Answer:
B
Explanation:
A)
B)
C)
D)
81)
81)
Pressure vessels can be hazardous because:
A)
They are large and technicians might trip over them.
B)
They can cause electrical shock if the internal motor shorts out.
C)
They can rupture violently like a bomb.
D)
They emit harmful UV light at higher working pressures.
Answer:
C
Explanation:
A)
B)
C)
D)
82)
82)
Federal law mandates that:
A)
All used refrigerants must be sold to an OSHA certified reclamation site.
B)
All used refrigerants must be sold to an ESCO certified reclamation site.
C)
All used refrigerants must be taken to a UL or ANSI certified reclamation site.
D)
All used refrigerants must be taken to an EPA certified reclamation site.
Answer:
D
Explanation:
A)
B)
C)
D)
22
83)
83)
To avoid electrical shock, what class fire extinguisher should be used on electrical equipment?
A)
Class A
B)
Class D
C)
Class B
D)
Class C
Answer:
D
Explanation:
A)
B)
C)
D)
84)
84)
Refrigerant recovery cylinders should not be filled above:
A)
70% of their volume with liquid.
B)
80% of their volume with liquid.
C)
100% of their volume with liquid.
D)
90% of their volume with liquid.
Answer:
B
Explanation:
A)
B)
C)
D)
85)
85)
In case of an accident, the first step is:
A)
Administer first aid.
B)
Call 911.
C)
Report the accident to the office.
D)
File an insurance report.
Answer:
B
Explanation:
A)
B)
C)
D)
86)
86)
The date of inspection for refrigerant containers that require inspection:
A)
Must be stamped on the top of the container.
B)
Should be painted by the number of the refrigerant type on the side of the container.
C)
Must be painted the same color as the refrigerant container.
D)
Is always stamped on the bottom of the container.
Answer:
A
Explanation:
A)
B)
C)
D)
23
87)
87)
What are the most common sizes for the shank on a socket handle?
A)
3/8 in, 3/4 in, and 1 in
B)
1/2 in, 3/4 in, and 1 in
C)
1/4 in, 3/8 in, 1/2 in
D)
1/8 in, 1/4 in, and 3/4 in
Answer:
C
Explanation:
A)
B)
C)
D)
88)
88)
What type of tool is used to loosen the set screws on fan blade hubs?
A)
A large flat–blade screwdriver
B)
Allen wrench
C)
Hacksaw
D)
Locking pliers
Answer:
B
Explanation:
A)
B)
C)
D)
89)
89)
Why is it important that the same force be used when tightening nuts and bolts on compressors?
A)
Most compressor heads have only two bolts.
B)
It is easier to tighten evenly all the way around.
C)
You may not always have Permagasket to help.
D)
Gaskets can seat unevenly and leak.
Answer:
D
Explanation:
A)
B)
C)
D)
90)
90)
What are the most common sizes of standard sockets?
A)
Sockets do not come in different sizes
B)
From 0.1 in up to 1 in in 0.1–in increments
C)
From 1/4 in up to 1 in in 1/16–in increments
D)
From 1/3 in up to 1 in in 1/6–in increments
Answer:
C
Explanation:
A)
B)
C)
D)
24
91)
91)
What tool is used to remove the hex–head machine screws in equipment panels?
A)
Phillips head screwdriver
B)
The nut driver
C)
Locking pliers
D)
Adjustable wrench
Answer:
B
Explanation:
A)
B)
C)
D)
92)
92)
Hacksaws cut:
A)
In helical oscillation created by vibrating the handle.
B)
On the back stroke.
C)
On the forward stroke.
D)
On both forward and back strokes.
Answer:
C
Explanation:
A)
B)
C)
D)
93)
93)
When using a torque wrench to tighten a circular compressor head:
A)
Set the wrench to 120% of the specification to allow for loosening.
B)
Tighten all the bolts to a lower torque, repeat with a slightly higher torque, and finally
tighten all the bolts to the specified torque.
C)
Tighten the bolts in a clockwise pattern, working your way around the circle.
D)
Apply a bead of silicone sealant to the gasket before starting
Answer:
B
Explanation:
A)
B)
C)
D)
94)
94)
What is the purpose of a duct stretcher?
A)
There is no such thing as a duct stretcher.
B)
To increase the length of a sheet metal duct when it is within ¼ in
C)
To pull flexible duct straight
D)
To pull rectangular duct together when using drive cleats
Answer:
D
Explanation:
A)
B)
C)
D)
25
95)
95)
What is the difference between a flare–nut wrench and a standard box wrench?
A)
Flare–nut wrenches ratchet and box wrenches do not.
B)
The flare wrench heads are slotted to slip over the tubing.
C)
A flare wrench is just a renamed box wrench.
D)
Box wrenches have only four sides and points, flare wrenches have six.
Answer:
B
Explanation:
A)
B)
C)
D)
96)
96)
Deburring tools are used for:
A)
Removing rough edges from electrical wiring.
B)
Removing splinters from wood frame members.
C)
Removing the small burr left by pipe cutters.
D)
Preparing a compressor head before applying a head gasket.
Answer:
C
Explanation:
A)
B)
C)
D)
97)
97)
Electrical pliers can be used for cutting what types of material?
A)
Bolts
B)
Copper wire
C)
Nails
D)
Steel cable
Answer:
B
Explanation:
A)
B)
C)
D)
98)
98)
What should be done with damaged tools?
A)
Convert them to use for something else.
B)
Throw them away.
C)
Donate them to Goodwill.
D)
Use them more carefully.
Answer:
B
Explanation:
A)
B)
C)
D)
26
99)
99)
What is a service valve wrench?
A)
A ratchet wrench with square openings that fit service valve stems
B)
A tool used to change the core in Schrader valves
C)
A wrench used to install service valves on a hermetic system
D)
A pair of pliers that is used to turn a manual service valve stem
Answer:
A
Explanation:
A)
B)
C)
D)
100)
100)
To keep rust from forming on hand tools, technicians can:
A)
Apply a light coat of oil to the metal parts.
B)
Paint all your hand tools with a rust–inhibiting paint.
C)
Keep each tool inside a plastic bag.
D)
Sand the outside of the tool periodically.
Answer:
A
Explanation:
A)
B)
C)
D)
101)
101)
What are right–handed aviation snips used for?
A)
Making cuts in sheet metal that curve to the left
B)
Making long, straight cuts in sheet metal
C)
Making cuts in sheet metal in any direction
D)
Making cuts in sheet metal that curve to the right
Answer:
D
Explanation:
A)
B)
C)
D)
102)
102)
What PPE should be worn when handling sheet metal?
A)
A respirator
B)
No PPE is necessary to handle sheet metal.
C)
Gloves
D)
Self–contained breathing apparatus
Answer:
C
Explanation:
A)
B)
C)
D)
27
103)
103)
Two standards for flare fittings are:
A)
Imperial metric and standard.
B)
Aluminum and magnesium.
C)
Imperial standard and metric.
D)
The National Pipe and the Society of Automotive Engineers (SAE).
Answer:
D
Explanation:
A)
B)
C)
D)
104)
104)
What is the best way to increase the turning force on a hard–to–turn bolt?
A)
Use a breaker bar.
B)
Use a shorter–length socket handle to get a better grip.
C)
Strike the socket handle with a hammer.
D)
Slip a length of pipe over the socket handle to increase the leverage.
Answer:
A
Explanation:
A)
B)
C)
D)
105)
105)
Why should pliers NOT be used to tighten bolts and nuts?
A)
It is too difficult to get the pliers to fit the nut.
B)
They will round off the corners.
C)
They will overtighten the nut.
D)
They will strip the threads of the bolt.
Answer:
B
Explanation:
A)
B)
C)
D)
106)
106)
Why are mushroomed chisel heads dangerous?
A)
Chips may break off.
B)
The head becomes extremely bouncy.
C)
The mushrooms on the head make it slippery.
D)
The chisel is soft and rotten.
Answer:
A
Explanation:
A)
B)
C)
D)
28
107)
107)
What type of fastener is used for assembling on–site metal ducts?
A)
Nails
B)
Round–tipped sheet–metal screws
C)
Self–starting sheet–metal screws
D)
Wood screws
Answer:
C
Explanation:
A)
B)
C)
D)
108)
108)
What type of thread does a 2 × 3/8 NF–24 bolt have?
A)
National coarse, 24 threads per inch
B)
National fine, 24 ft–lb of torque
C)
Normal capacity, 24 ft–lb of torque
D)
National fine, 24 threads per inch
Answer:
D
Explanation:
A)
B)
C)
D)
109)
109)
A common use for wood screws in HVACR work is:
A)
Connecting sheet–metal ductwork together.
B)
Attaching hanging straps to wooden structures.
C)
Fastening power wires to floor joists.
D)
Supporting flex duct by screwing it directly to floor joists.
Answer:
B
Explanation:
A)
B)
C)
D)
110)
110)
What is the difference between the way a self–threading and a self–drilling sheet–metal screw is
used?
A)
Self–threading screws must have a pilot hole.
B)
Self–threading screws can only be installed with a counterclockwise rotation.
C)
Self–drilling screws must have a pilot hole.
D)
Self–drilling screws can only be installed with a counterclockwise rotation.
Answer:
A
Explanation:
A)
B)
C)
D)
29
111)
111)
Three common types of nails include:
A)
Hollow–point, blunt–point, and sharp–point.
B)
Common nails, box nails, and finishing nails.
C)
Forged, wrought, and cast.
D)
Round–head, hex–head, and flat–head.
Answer:
B
Explanation:
A)
B)
C)
D)
112)
112)
How is the length of a pop rivet determined?
A)
By the radius of the tip of the pop rivet
B)
By the width of the tip of the pop rivet
C)
By the circumference of the head of the pop rivet
D)
By the distance from the tip to the head of the pop rivet
Answer:
D
Explanation:
A)
B)
C)
D)
113)
113)
How are staples used for fastening duct insulation different from normal staples?
A)
The tips of the staple are bent outward as the staple goes through the fabric.
B)
They bend inward to help secure the insulation to the duct.
C)
They are stronger to pierce the sheet metal ductwork.
D)
They are corrugated.
Answer:
A
Explanation:
A)
B)
C)
D)
114)
114)
A 5/16–in bolt with national coarse threads will have:
A)
16 threads per inch.
B)
20 threads per inch.
C)
24 threads per inch.
D)
18 threads per inch.
Answer:
D
Explanation:
A)
B)
C)
D)
30
115)
115)
Which type of head works well for driving with a drill and magnetic nut driver?
A)
Round head with straight slot
B)
Pan head with phillips slot
C)
Hex head
D)
Countersunk head with straight slot
Answer:
C
Explanation:
A)
B)
C)
D)
116)
116)
What type of head is the most common for screws used on unit covers?
A)
Allen head
B)
Round head
C)
Hex head
D)
Square head
Answer:
C
Explanation:
A)
B)
C)
D)
117)
117)
What type of screws are used on electrical panels?
A)
Self–tapping sheet–metal screws
B)
Nails
C)
Round–tipped sheet–metal screws
D)
Wood screws
Answer:
C
Explanation:
A)
B)
C)
D)
118)
118)
Enlarging of the end of a rivet is called:
A)
Upsetting the rivet.
B)
Flanging the rivet.
C)
Forging the rivet.
D)
Terminating the rivet.
Answer:
A
Explanation:
A)
B)
C)
D)
31
119)
119)
Why should you use round–tipped sheet metal screws?
A)
To minimize the possibility of bodily harm
B)
To minimize the possibility of damaging the sheet metal during installation
C)
To eliminate the possibility of a sharp point damaging electrical wire insulation
D)
To expedite the installation process
Answer:
C
Explanation:
A)
B)
C)
D)
120)
120)
Pointed, self–threading, round–tipped, and self–drilling are all types of:
A)
Rivets.
B)
Sheet–metal screws.
C)
Bolts.
D)
Wood screws.
Answer:
B
Explanation:
A)
B)
C)
D)
121)
121)
What type of fastener can be threaded into a nut?
A)
Sheet–metal screws
B)
Bolts
C)
Lag bolts
D)
Wood screws
Answer:
B
Explanation:
A)
B)
C)
D)
122)
122)
Why should you never force a nut, bolt, or screw when it does not fit correctly?
A)
You can cross–thread the part and strip the threads.
B)
You can loosen the bolt and lose it within the part.
C)
You can cause discoloration to the nut, bolt, or screw.
D)
You can undermine the integrity of the adhesive holding it in place.
Answer:
A
Explanation:
A)
B)
C)
D)
32
123)
123)
Why are slotted–head screws usually installed manually using a flat–blade screwdriver?
A)
It is not possible to make flat–blade screwdriver tips for drills.
B)
Federal legislation protecting domestic screwdriver manufacturers prohibits the sale of
flat–blade screw driver tips for power drills.
C)
It is very difficult to keep the bit aligned in the slot with a drill.
D)
The buildup of high static electricity charges can cause dangerous arcs.
Answer:
C
Explanation:
A)
B)
C)
D)
124)
124)
What type of head do most sheet–metal screws have?
A)
Pan head
B)
Hex head
C)
Round head
D)
Countersunk head
Answer:
B
Explanation:
A)
B)
C)
D)
125)
125)
Why should special safety protection always be used when driving ballistic concrete nails?
A)
Because of flying chips of cracking concrete
B)
Because of fumes
C)
Because of broken nail bits
D)
Because of random sparks
Answer:
A
Explanation:
A)
B)
C)
D)
126)
126)
Ballistic concrete nails are driven in using:
A)
A hammer.
B)
A small charge that resembles a .22–caliber blank cartridge.
C)
A pneumatic nail gun.
D)
An electric nail gun.
Answer:
B
Explanation:
A)
B)
C)
D)
33
127)
127)
What type of head is used for screws on electrical terminals?
A)
Hex head
B)
Countersunk head
C)
Pan head
D)
Flat head
Answer:
C
Explanation:
A)
B)
C)
D)
128)
128)
Which type of thread standard uses more threads per inch?
A)
National coarse (NC)
B)
National fine (NF)
C)
AHRI standard threads
D)
Pipe threads
Answer:
B
Explanation:
A)
B)
C)
D)
129)
129)
What is the difference between the way a self–threading and a self–drilling sheet metal screw is
used?
A)
Self–threading screws must have a pilot hole.
B)
Self–drilling can only be installed with a counterclockwise rotation.
C)
Self–drilling screws must have a pilot hole.
D)
Self–threading can only be installed with a counterclockwise rotation.
Answer:
A
Explanation:
A)
B)
C)
D)
130)
130)
How do you prevent the rivet from spinning when you are drilling?
A)
By keeping the drill bit perpendicular to one side
B)
By keeping the drill bit straight up
C)
By angling the drill bit slightly to one side
D)
By angling the drill bit completely to one side
Answer:
C
Explanation:
A)
B)
C)
D)
34
131)
131)
A 5/16–in bolt with national fine threads will have:
A)
16 threads per inch.
B)
20 threads per inch.
C)
24 threads per inch.
D)
18 threads per inch.
Answer:
C
Explanation:
A)
B)
C)
D)
132)
132)
Why are the ends of round–tipped sheet–metal screws not threaded?
A)
To protect against shorting of wires within the electrical panel
B)
To protect against damaging the sheet metal
C)
To prevent sheet metal from bulking
D)
To assist with self–drilling
Answer:
A
Explanation:
A)
B)
C)
D)
133)
133)
The best way to remove a pop rivet is:
A)
Drilling it out.
B)
A cutting torch.
C)
A hammer and chisel.
D)
Unscrewing it.
Answer:
A
Explanation:
A)
B)
C)
D)
134)
134)
What are the estimated dimensions of a room with a 2– ×– 2–foot drop ceiling that is 10 tiles wide
and 15 tiles long?
A)
10 feet by 15 feet
B)
20 feet by 30 feet
C)
20 feet by 60 feet
D)
40 feet by 30 feet
Answer:
B
Explanation:
A)
B)
C)
D)
35
135)
135)
The area of a 20– ×– 24–inch filter is:
A)
24 – 20 = 4 square inches.
B)
20 + 24 = 44 square inches.
C)
20 square inches with a remainder of 4.
D)
20 × 24 = 480 square inches.
Answer:
D
Explanation:
A)
B)
C)
D)
136)
136)
How many grains are in a pound?
A)
12
B)
16
C)
7,000
D)
144
Answer:
C
Explanation:
A)
B)
C)
D)
137)
137)
The SI unit for length is:
A)
Meter.
B)
Yard.
C)
Foot.
D)
Kilogram.
Answer:
A
Explanation:
A)
B)
C)
D)
138)
138)
Refrigerant quantities in air–conditioning systems are often expressed in:
A)
Ounces, decimal pounds, or pounds and ounces.
B)
Grains, grams, or pounds.
C)
Fahrenheit degrees equivalency.
D)
Psig equivalency.
Answer:
A
Explanation:
A)
B)
C)
D)
36
139)
139)
In the United States, liquid volume is measured in:
A)
Ounces, cups, pints, quarts, gallons.
B)
Square inches and square feet.
C)
Ounces, pounds, gross, kilos.
D)
Milliliters and liters.
Answer:
A
Explanation:
A)
B)
C)
D)
140)
140)
To find the volume of a cylinder, it is necessary to:
A)
Multiply the diameter by the height.
B)
First calculate the area of the circle forming the base.
C)
Find the volume of the circle forming base.
D)
Measure the circumference.
Answer:
B
Explanation:
A)
B)
C)
D)
141)
141)
The SI unit for mass (and weight) used today is:
A)
Kilogram.
B)
Pound.
C)
Ounce.
D)
Meter.
Answer:
A
Explanation:
A)
B)
C)
D)
142)
142)
Which of the following is used to estimate the size of a room?
A)
Drop ceilings
B)
Room trim
C)
Window frames
D)
Bricks
Answer:
A
Explanation:
A)
B)
C)
D)
37
143)
143)
What physical properties are most often measured?
A)
Hardness, reflectivity, volume, temperature
B)
Temperature, polarization, weight, distance
C)
Distance, area, volume, and weight
D)
Physical attributes cannot be measured.
Answer:
C
Explanation:
A)
B)
C)
D)
144)
144)
For which of the following measurements is area used?
A)
Volume
B)
Surfaces
C)
Depth
D)
Lines
Answer:
B
Explanation:
A)
B)
C)
D)
145)
145)
In order to determine heat flow, one must know the amount of time and:
A)
Atmospheric pressure.
B)
Substance weight.
C)
British thermal units.
D)
Air flow.
Answer:
C
Explanation:
A)
B)
C)
D)
146)
146)
Cubic yards are typically used to measure:
A)
Large volumes of dirt.
B)
Amounts of refrigerant.
C)
Small containers of oil.
D)
Floor space in a home.
Answer:
A
Explanation:
A)
B)
C)
D)
38
147)
147)
What type of measurement is stated in square feet?
A)
Volume
B)
Length
C)
Area
D)
Angularity
Answer:
C
Explanation:
A)
B)
C)
D)
148)
148)
Units that cannot be measured in base units and require more than one measurement are called:
A)
BTUs.
B)
Customary units.
C)
Volume.
D)
Derived units.
Answer:
D
Explanation:
A)
B)
C)
D)
149)
149)
What is the difference between a volume measurement and a rate measurement?
A)
Rate measurements are more accurate.
B)
Rate measurements are more flexible.
C)
Volume measurements include time.
D)
Rate measurements include time.
Answer:
D
Explanation:
A)
B)
C)
D)
150)
150)
The space in a room is measured by:
A)
Inches.
B)
Feet.
C)
Square feet.
D)
Cubic feet.
Answer:
D
Explanation:
A)
B)
C)
D)
151)
151)
What units are used to measure volume?
A)
Square feet
B)
Feet of volume
C)
Cubic feet
D)
Voluability
Answer:
C
Explanation:
A)
B)
C)
D)
39
152)
152)
What is the estimated length of a building that has 35 roof rafters 24 inches on center?
A)
68 feet
B)
72 feet
C)
66 feet
D)
70 feet
Answer:
A
Explanation:
A)
B)
C)
D)
153)
153)
Area measurements are used to measure:
A)
The size of a floor in a room.
B)
The distance between cities.
C)
The space in a room.
D)
Location within a city.
Answer:
A
Explanation:
A)
B)
C)
D)
154)
154)
What is the estimated length of a wall that has 31 studs 16 inches on center?
A)
30 feet
B)
30 feet 4 inches
C)
40 feet
D)
41 feet 4 inches
Answer:
C
Explanation:
A)
B)
C)
D)
155)
155)
What is the estimated length of a wall that is covered by 12 pieces of sheathing hung vertically?
A)
72 feet
B)
98 feet
C)
24 feet
D)
48 feet
Answer:
D
Explanation:
A)
B)
C)
D)
156)
156)
The SI unit used to indicate pressure in HVACR systems is:
A)
Meter.
B)
Psi.
C)
Kilopascal.
D)
Kilogram.
Answer:
C
Explanation:
A)
B)
C)
D)
40