CWB WELDING INSPECTOR COMPREHENSIVE EXAMS
QUESTIONS AND ANSWERS 2025/2026
✔✔UV radiation - ✔✔can cause reddening and burning of the skin; can also burn the
surface of the cornea
✔✔Infrared Radiation - ✔✔transfers from the heat of the source of light to the body
✔✔PPE - ✔✔personal protective equipment;
clothing, headgear, eyewear, hearing protection, respirators
✔✔Protective clothing - ✔✔provide protection from radiation, heat, ignition, noise, &
electric shock
✔✔Transparent welding curtain (TWC) - ✔✔provides shielding from radiation
✔✔Opaque panel and curtain - ✔✔blocks all radiation
✔✔Noise - ✔✔most common workplace hazard
✔✔Hearing Protection - ✔✔device that reduces sound level entering the ear
✔✔Sound level meter - ✔✔detects air pressure variations created by sound and
changes into electrical signals
✔✔Noise dosimeter - ✔✔measures and stores the variable sound levels the worker is
exposed throughout the shift
✔✔Threshold limit values (TLV) - ✔✔levels on workers can be exposed to w/out any
hearing protection & not suffer any health effects
✔✔Iron Oxides - ✔✔major contaminant in all iron steel welding process;
✔✔General/Dilution Ventilation - ✔✔uses air movement to remove or dilute the
contaminated air from welding area and replenish fresh air
✔✔Natural ventilation - ✔✔welding outdoors or opening shop windows and doors to
reduce the fume concentration
✔✔Mechanical Ventilation - ✔✔uses fans or air blowers to remove or dilute the welding
fume and provide fresh air
✔✔Local Exhaust Ventilation - ✔✔most effective way of removing fumes and gases in
the welding area
, ✔✔Local Exhaust Ventilation - ✔✔removes toxic gases and fumes and vapours before
they mix with the room air
✔✔FCAW, GMAW, PAW, GTAW - ✔✔uses shielding gases such as argon, carbon
dioxide, helium & nitrogen to protect the molten weld puddle
✔✔Effects of Hydrogen - ✔✔explosion, fire, asphyxiation
✔✔Effects of Acetylene - ✔✔oxygen deficiency, asphyxiation, coma, death, dizziness,
headache, nausea, fatigue
✔✔Effects of hydrogen chloride, phosgene - ✔✔delayed irritation & toxic effect on
upper respiratory tract; excess fluid in lungs
✔✔Argon, carbon dioxide, helium, nitrogen - ✔✔gases that are odorless and invisible;
not detectable by human senses
✔✔Argon - ✔✔heavier than air; tends to accumulate in the lower portion of confined
space
✔✔Helium - ✔✔lighter than air; accumulates in the upper portion of the confined space
✔✔Ozone - ✔✔formed by UV light emitted from the air interacting with the oxygen; has
pungent smell and respiratory irritant
✔✔How to control ozone - ✔✔changing the consumable or the welding procedure
✔✔Ozone is problem on - ✔✔GTAW, GMAW on aluminum, SS
✔✔Lockout/Tagout - ✔✔used to de-energize or isolate energy sources
✔✔Fire Triangle - ✔✔diagram to understand the aspect of fire and explosions
✔✔Requirements to start a fire - ✔✔fuel, oxygen, and source of heat or ignition
✔✔Class B (fire) - ✔✔flammable liquids; not efficient to handle the high temp cooking oil
and grease fires in kitchen
✔✔Class K (fire) - ✔✔Oil and grease
✔✔Class A (fire) - ✔✔ordinary combustibles; wood or paper
✔✔Class C - ✔✔Live electrical equipment
QUESTIONS AND ANSWERS 2025/2026
✔✔UV radiation - ✔✔can cause reddening and burning of the skin; can also burn the
surface of the cornea
✔✔Infrared Radiation - ✔✔transfers from the heat of the source of light to the body
✔✔PPE - ✔✔personal protective equipment;
clothing, headgear, eyewear, hearing protection, respirators
✔✔Protective clothing - ✔✔provide protection from radiation, heat, ignition, noise, &
electric shock
✔✔Transparent welding curtain (TWC) - ✔✔provides shielding from radiation
✔✔Opaque panel and curtain - ✔✔blocks all radiation
✔✔Noise - ✔✔most common workplace hazard
✔✔Hearing Protection - ✔✔device that reduces sound level entering the ear
✔✔Sound level meter - ✔✔detects air pressure variations created by sound and
changes into electrical signals
✔✔Noise dosimeter - ✔✔measures and stores the variable sound levels the worker is
exposed throughout the shift
✔✔Threshold limit values (TLV) - ✔✔levels on workers can be exposed to w/out any
hearing protection & not suffer any health effects
✔✔Iron Oxides - ✔✔major contaminant in all iron steel welding process;
✔✔General/Dilution Ventilation - ✔✔uses air movement to remove or dilute the
contaminated air from welding area and replenish fresh air
✔✔Natural ventilation - ✔✔welding outdoors or opening shop windows and doors to
reduce the fume concentration
✔✔Mechanical Ventilation - ✔✔uses fans or air blowers to remove or dilute the welding
fume and provide fresh air
✔✔Local Exhaust Ventilation - ✔✔most effective way of removing fumes and gases in
the welding area
, ✔✔Local Exhaust Ventilation - ✔✔removes toxic gases and fumes and vapours before
they mix with the room air
✔✔FCAW, GMAW, PAW, GTAW - ✔✔uses shielding gases such as argon, carbon
dioxide, helium & nitrogen to protect the molten weld puddle
✔✔Effects of Hydrogen - ✔✔explosion, fire, asphyxiation
✔✔Effects of Acetylene - ✔✔oxygen deficiency, asphyxiation, coma, death, dizziness,
headache, nausea, fatigue
✔✔Effects of hydrogen chloride, phosgene - ✔✔delayed irritation & toxic effect on
upper respiratory tract; excess fluid in lungs
✔✔Argon, carbon dioxide, helium, nitrogen - ✔✔gases that are odorless and invisible;
not detectable by human senses
✔✔Argon - ✔✔heavier than air; tends to accumulate in the lower portion of confined
space
✔✔Helium - ✔✔lighter than air; accumulates in the upper portion of the confined space
✔✔Ozone - ✔✔formed by UV light emitted from the air interacting with the oxygen; has
pungent smell and respiratory irritant
✔✔How to control ozone - ✔✔changing the consumable or the welding procedure
✔✔Ozone is problem on - ✔✔GTAW, GMAW on aluminum, SS
✔✔Lockout/Tagout - ✔✔used to de-energize or isolate energy sources
✔✔Fire Triangle - ✔✔diagram to understand the aspect of fire and explosions
✔✔Requirements to start a fire - ✔✔fuel, oxygen, and source of heat or ignition
✔✔Class B (fire) - ✔✔flammable liquids; not efficient to handle the high temp cooking oil
and grease fires in kitchen
✔✔Class K (fire) - ✔✔Oil and grease
✔✔Class A (fire) - ✔✔ordinary combustibles; wood or paper
✔✔Class C - ✔✔Live electrical equipment
