CWB Level 2 Exam Prep
Questions And Correct Answers
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
What is the typical max. OCV of an AC welding machine?
80 V
In an isometric drawing, the lines (for width, length and depth) are inclined at
an angle of how many degrees?
30°
Questions And Correct Answers
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
What is the typical max. OCV of an AC welding machine?
80 V
In an isometric drawing, the lines (for width, length and depth) are inclined at
an angle of how many degrees?
30°
