CWB LEVEL II Exam Questions And
Correct Answers
What is the term used to describe the following condition of lost corrosion resistance?
"When certain stainless steels are heated between 500-850° C, carbides form at the
grain boundaries and cause a local depletion of chromium."
(A) Oxidization
(B) Increased toughness
(C) Solution heat treatment
(D) Sensitization
(D) Sensitization
Note: Also known as "carbide precipitation" -- Chromium binds to carbides, and "sweats
out" at the grain boundaries
On a radiograph, undercut appears as a _________ line.
(A) light
(B) dark
(B) dark
,What is the Canadian Standard for safety in welding?
CSA W117.2
What is the typical three-phase input voltage in most Canadian welding shops?
600V
True or False: The cable from the workpiece back to the welding machine is called the
"ground lead".
False. The correct term is the "work lead".
What is the type of radiation that can damage living cells?
Ionizing
Name two examples of ionizing radiation.
X-rays and Gamma rays
What is the minimum suggested shade for a welding helmet when using 5/32 SMAW
electrode at 150 A?
,Shade 10
Approx. how far could spatter travel when welding/cutting from 2.5m high?
Possibly up to 6m
What is the toxic component contained in some copper alloys?
Beryllium
Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW]
FCAW
What do the terms TLV and TWA stand for?
TLV: Threshold limit value
TWA: Time weighted average
Is helium lighter or heavier than air?
Lighter
, The action of UV light on oxygen produces which toxic gas?
Ozone
Which common fuel gas has the widest range where it can become flammable when
mixed with air?
Acetylene
What substance should you NEVER apply to a stiff pressure-adjusting screw on an
oxygen regulator?
Oil or grease
What is the maximum gauge pressure that acetylene should be used? (kPa/psi)
103 kPa (15 psi)
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon
solvents?
Phosgene gas
Correct Answers
What is the term used to describe the following condition of lost corrosion resistance?
"When certain stainless steels are heated between 500-850° C, carbides form at the
grain boundaries and cause a local depletion of chromium."
(A) Oxidization
(B) Increased toughness
(C) Solution heat treatment
(D) Sensitization
(D) Sensitization
Note: Also known as "carbide precipitation" -- Chromium binds to carbides, and "sweats
out" at the grain boundaries
On a radiograph, undercut appears as a _________ line.
(A) light
(B) dark
(B) dark
,What is the Canadian Standard for safety in welding?
CSA W117.2
What is the typical three-phase input voltage in most Canadian welding shops?
600V
True or False: The cable from the workpiece back to the welding machine is called the
"ground lead".
False. The correct term is the "work lead".
What is the type of radiation that can damage living cells?
Ionizing
Name two examples of ionizing radiation.
X-rays and Gamma rays
What is the minimum suggested shade for a welding helmet when using 5/32 SMAW
electrode at 150 A?
,Shade 10
Approx. how far could spatter travel when welding/cutting from 2.5m high?
Possibly up to 6m
What is the toxic component contained in some copper alloys?
Beryllium
Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW]
FCAW
What do the terms TLV and TWA stand for?
TLV: Threshold limit value
TWA: Time weighted average
Is helium lighter or heavier than air?
Lighter
, The action of UV light on oxygen produces which toxic gas?
Ozone
Which common fuel gas has the widest range where it can become flammable when
mixed with air?
Acetylene
What substance should you NEVER apply to a stiff pressure-adjusting screw on an
oxygen regulator?
Oil or grease
What is the maximum gauge pressure that acetylene should be used? (kPa/psi)
103 kPa (15 psi)
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon
solvents?
Phosgene gas
