CWB Level 2 All Modules EXPECTED QUESTIONS WITH
VERIFIED ANSWERS
Question 1.
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
ANSWER
(D) Sensitization
Note: Also known as "carbide precipitation" --Chromium binds to carbides, and "sweats out" at
the grain boundaries
Question 2.
On a radiograph, undercut appears as a _________ line.
(A) light
(B) dark
ANSWER
(B) dark
Question 3.
What is the Canadian Standard for safety in welding?
ANSWER
CSA W117.2
Question 4.
What is the typical three-phase input voltage in most Canadian welding shops?
ANSWER
600V
,Question 5.
True or False: The cable from the workpiece back to the welding machine is called the "ground lead".
ANSWER
False. The correct term is the "work lead".
Question 6.
What is the type of radiation that can damage living cells?
ANSWER
Ionizing
Question 7.
Name two examples of ionizing radiation.
ANSWER
X-rays and Gamma rays
Question 8.
What is the minimum suggested shade for a welding helmet when using 5/32 SMAW electrode at 150
A?
ANSWER
Shade 10
Question 9.
Approx. how far could spatter travel when welding/cutting from 2.5m high?
ANSWER
Possibly up to 6m
Question 10.
What is the toxic component contained in some copper alloys?
ANSWER
Beryllium
,Question 11.
Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW]
ANSWER
FCAW
Question 12.
What do the terms TLV and TWA stand for?
ANSWER
TLV: Threshold limit value TWA: Time weighted average
Question 13.
The action of UV light on oxygen produces which toxic gas?
ANSWER
Ozone
Question 14.
Which common fuel gas has the widest range where it can become flammable when mixed with air?
ANSWER
Acetylene
Question 15.
What substance should you NEVER apply to a stiff pressure-adjusting screw on an oxygen regulator?
ANSWER
Oil or grease
Question 16.
What is the maximum gauge pressure that acetylene should be used? (kPa/psi)
ANSWER
103 kPa (15 psi)
, Question 17.
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon solvents?
ANSWER
Phosgene gas
Question 18.
What is the typical max. OCV of an AC welding machine?
ANSWER
80 V
Question 19.
In an isometric drawing, the lines (for width, length and depth) are inclined at an angle of how many
degrees?
ANSWER
30°
Question 20.
What are the maximum number of views in an orthographic drawing?
ANSWER
6
Question 21.
What are the two general classes of picture drawings?
ANSWER
Perspective and Isometric
VERIFIED ANSWERS
Question 1.
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
ANSWER
(D) Sensitization
Note: Also known as "carbide precipitation" --Chromium binds to carbides, and "sweats out" at
the grain boundaries
Question 2.
On a radiograph, undercut appears as a _________ line.
(A) light
(B) dark
ANSWER
(B) dark
Question 3.
What is the Canadian Standard for safety in welding?
ANSWER
CSA W117.2
Question 4.
What is the typical three-phase input voltage in most Canadian welding shops?
ANSWER
600V
,Question 5.
True or False: The cable from the workpiece back to the welding machine is called the "ground lead".
ANSWER
False. The correct term is the "work lead".
Question 6.
What is the type of radiation that can damage living cells?
ANSWER
Ionizing
Question 7.
Name two examples of ionizing radiation.
ANSWER
X-rays and Gamma rays
Question 8.
What is the minimum suggested shade for a welding helmet when using 5/32 SMAW electrode at 150
A?
ANSWER
Shade 10
Question 9.
Approx. how far could spatter travel when welding/cutting from 2.5m high?
ANSWER
Possibly up to 6m
Question 10.
What is the toxic component contained in some copper alloys?
ANSWER
Beryllium
,Question 11.
Which welding process will likely have the highest fume generation rate?
[SMAW / SAW / FCAW]
ANSWER
FCAW
Question 12.
What do the terms TLV and TWA stand for?
ANSWER
TLV: Threshold limit value TWA: Time weighted average
Question 13.
The action of UV light on oxygen produces which toxic gas?
ANSWER
Ozone
Question 14.
Which common fuel gas has the widest range where it can become flammable when mixed with air?
ANSWER
Acetylene
Question 15.
What substance should you NEVER apply to a stiff pressure-adjusting screw on an oxygen regulator?
ANSWER
Oil or grease
Question 16.
What is the maximum gauge pressure that acetylene should be used? (kPa/psi)
ANSWER
103 kPa (15 psi)
, Question 17.
Which toxic gas is produced when welding on surfaces with chlorinated hydrocarbon solvents?
ANSWER
Phosgene gas
Question 18.
What is the typical max. OCV of an AC welding machine?
ANSWER
80 V
Question 19.
In an isometric drawing, the lines (for width, length and depth) are inclined at an angle of how many
degrees?
ANSWER
30°
Question 20.
What are the maximum number of views in an orthographic drawing?
ANSWER
6
Question 21.
What are the two general classes of picture drawings?
ANSWER
Perspective and Isometric
