120101e Welding Safety

Question 1

Question: What type of light energy causes arc flash (also known as welding flash or arc eye)?

a) Visible light rays
b) Ultraviolet rays
c) Infrared rays
d) Gamma rays

Answer 1

Answer: b) Ultraviolet rays

Question 2

Question: What is the maximum permitted sound level for an 8-hour day?

a) 85 decibels
b) 88 decibels
c) 90 decibels
d) 95 decibels

Answer 2

Answer: a) 85 decibels

Question 3

Question: When treating hypothermia, the body temperature of the individual should be raised slowly.

a) True
b) False

Answer 3

Answer: a) True. To treat hypothermia, the body temperature must be raised slowly, warm
liquids without caffeine and medical attention should be given as soon as
possible.

Question 4

Question: What shade of filter plate should be used when welding, using low to medium amperage with the SMAW process?

a) Shade #6
b) Shade #10
c) Shade #11
d) Shade #12

Answer 4

Answer: b) Shade #10

Question 5

Question: What type of clothing offers the best protection against sparks and molten slag?

a) Leather
b) Denim
c) Wool
d) Cotton

Answer 5

Answer: a) Leather

Question 6

Question: What type of respirator should not be used if the atmosphere has been deemed immediately dangerous to life and health?

a) Airline respirator
b) Self-contained breathing apparatus
c) Air purifying respirator
d) Pressure on demand respirator

Answer 6

Answer: c) Air purifying respirator

Question 7

Question: What material is the major cause of metal fume fever?

a) Stainless steel
b) Zinc
c) Aluminum
d) Cadmium

Answer 7

Answer: b) Zinc

Question 8

Question: What gas is produced when chlorinated-hydrocarbon degreasers are exposed to ultraviolet light?

a) Argon gas
b) Ethylene dichloride gas
c) Sulphur dioxide gas
d) Phosgene gas

Answer 8

Answer: d) Phosgene gas

Question 9

Question: What is the maximum allowable exposure to hydrogen sulphide (H2S) gas in an 8-hour period?

a) 10 ppm
b) 50 ppm
c) 100 ppm
d) 1000 ppm

Answer 9

Answer: a) 10 ppm

Question 10

Question: When a shop is using a general ventilation system, how many changes of air per hour should it provide?

a) 2
b) 4
c) 6
d) 8

Answer 10

Answer: b) 4

Question 11

Question: What type of smoke extracting system filters and then recirculates the air back into the shop?

a) Portable smoke extractor
b) Local ventilation system
c) General ventilation system
d) Isolation chamber

Answer 11

Answer: a) Portable smoke extractor

Question 12

Question: Fume extracting welding guns are most often used with the FCAW process.

a) True
b) False

Answer 12

a) True. When welding with the FCAW process, one of the disadvantages is the volume of fumes produced. Using a fume extracting gun helps minimize this hazard.

Question 13

Question: Power sources should be connected by a qualified electrician to ensure they have been properly grounded.

a) True
b) False

Answer 13

a) True. Having the power source connected by a qualified electrician minimizes the risk of electric shock to the operator.

Question 14

Question: What should be done to electrically operated equipment prior to repair?

a) Send out an e-mail to alert workers
b) Locked out and warning notices posted
c) Let your direct supervisor know
d) Walk around the shop and verbally tell co-workers

Answer 14

Answer: b) Locked out and warning notices posted

Question 15

Question: Who has the responsibility of placing the lockout tag on the equipment’s circuit breaker prior to work being started?

a) A qualified electrician
b) The manufacturer of the equipment
c) Your supervisor
d) The worker doing the repairs

Answer 15

Answer: d) The worker doing the repairs

Question 16

After completing a welding job in a residential area, how long should someone designated as a fire watch remain on site?
a) 30 min
b) 45 min
c) 60 min
d) 2 hours

Answer 16

c) 60 min

Question 17

Hydrogen sulphide gas is lighter than air.
a) True
b) False

Answer 17

b) False. Hydrogen sulphide gas (H2S) is heavier than air (1.18 compared to air which is 1.00)

Question 18

When making a container safe for welding by purging, which gas should be used?
a) Oxygen
b) Argon
c) Acetylene
d) Hydrogen

Answer 18

b) Argon

Question 19

You have been assigned to work on steel beams high above the ground. Provide general protection information from the OHS Act that ensures the safety of yourself and those around you.

Answer 19

Your response should include some of the following points:

You should be tied off if you are working:
* At a vertical distance of 3 m or more
* If there is an unusual possibility of injury at a distance of less than 3 m
* Into or onto a hazardous substance or object or to avoid a fall through an opening in a work surface
* At a permanent work area where the height is more than 1.2 m and less than 3 m

Question 20

You have been tasked with using a portable angle grinder to smooth down rough edges on a beam. What safety precautions should you take to avoid accidentally injuring yourself or others as well as avoid damaging the equipment or the
surrounding area?

Answer 20

Your response should include some of the following points.

You should:
* Operate the grinder in accordance with manufacturer specifications.
* Ensure that the rpm of the disc should be equal or greater to the rpm of the grinder.
* Ensure that the object being ground is stationary if using a handheld grinder

Question 21

While in the shop you notice that your co worker is not wearing their hardhat. What section of the OHS Act details safety requirements for head protection, and what does it say?

Answer 21

Your response should include some of the following points.

You should wear protective headwear:
* If there is a foreseeable danger to the worker’s head.
* It must be appropriate to the hazards and meet requirements of CSA Standard CSA Z94.1-05.

Question 22

Permanent eye damage in the form of cataracts or retinal damage can result from
over exposure to which harmful light ray?
a) Visible
b) Infrared
c) Ultraviolet
d) Reflected

Answer 22

b) Infrared

Question 23

Which type of radiant energy can cause welding flash?
a) Visible light
b) Infrared light
c) Ultraviolet light
d) Gamma rays

Answer 23

c) Ultraviolet light

Question 24

What must be done where the public is exposed to harmful welding rays?
a) Put up proper screens and warning signs.
b) Let people look out for themselves.
c) Weld only when no one is around.
d) Avoid the use of a long arc length.

Answer 24

a) Put up proper screens and warning signs.

Question 25

What should you do immediately if you receive a major contact burn?
a) Rub the affected area with antibiotic cream.
b) Seek professional medical attention.
c) Cool the burned area by immersing in cool, still water.
d) Place the burned area under a fast-running warm water tap.

Answer 25

c) Cool the burned area by immersing in cool, still water.

Question 26

Which of the following is the most common workshop hazard?
a) Heavy weights
b) High noise levels
c) Other workers
d) Poisonous gases

Answer 26

b) High noise levels

Question 27

Above what noise level should hearing protection be worn?
a) 65 decibels
b) 85 decibels
c) 115 decibels
d) 135 decibels

Answer 27

b) 85 decibels

Question 28

What type of eye protection is recommended for grinding operations?
a) Full-face visor and safety glasses
b) Side shields
c) Welding goggles
d) Photoelectric welding helmet

Answer 28

a) Full-face visor and safety glasses

Question 29

What shade of filter plate is recommended for medium amperage GMAW
operations?
a) #9
b) #10
c) #11
d) # 12 or over

Answer 29

c) #11

Question 30

Which type of material offers the best protection against sparks and molten slag?
a) Leather
b) Wool
c) Nylon
d) Cotton

Answer 30

a) Leather

Question 31

What gloves are recommended for oxyfuel cutting?
a) Hard twist cotton
b) Silicon-treated nylon
c) Dry-tanned leather gauntlet style
d) Oil-treated cowhide with external cotton stitching

Answer 31

c) Dry-tanned leather gauntlet style

Question 32

Why is a fit test important when using a respirator?
a) More than one worker can use it.
b) You look professional on the job.
c) To prevent inward leaks of contaminated air.
d) You do not have to shave every day.

Question 33

Poisonous phosgene gas can be created by vapours of chlorinated hydrocarbon
degreasers.”What acts itpon the vapours to create the gas?
a) Local or general ventilation
b) High concentrations of visible light
c) Heavy volumes of fumes
d) Ultraviolet radiation from the welding arc

Answer 33

d) Ultraviolet radiation from the welding arc

Question 34

Which type of respirator uses filters and cannot be safely used in oxygen-deficient
atmospheres?
a) Air-purifying
b) Airline
c) Self-contained breathing apparatus
d) Emergency escape breathing apparatus

Answer 34

a) Air-purifying

Question 35

Which metal, when heated or welded, produces metal fume fever if the fumes are
inhaled?
a) Aluminum
b) Zinc
c) Chromium
d) Cobalt

Answer 35

b) Zinc

Question 36

What gas is produced when oxygen reacts with ultraviolet light from welding?
a) Phosphine
b) Nitrogen dioxide
c) Ozone
d) Carbon monoxide

Answer 36

c) Ozone

Question 37

When welding on metals plated with cadmium, which of the following is true?
a} Use a fully deoxidized filler metal to avoid porosity.
b) Consult SDS for safety procedures to follow.
c) General mechanical ventilation is adequate provided there are four complete air changes per hour.
d) A dust filter mask should be worn.

Answer 37

b) Consult SDS for safety procedures to follow.

Question 38

Hydrogen sulphide gas (H2S) found in oil and gas wells in concentrations as low as 500 ppm (0.05%) causes which of the following?
a) An uncomfortable rotten egg smell
b) Unconsciousness and death
c) An explosion
d) Burning of the eyes and throat

Answer 38

b) Unconsciousness and death

Question 39

What is the first line of defence against welding fumes and gases?
a) A supplied air respirator
b) Source extraction equipment
c) Complete all welding during the first half of your work shift
d) Weld outside

Answer 39

d) Weld outside

Question 40

What device breaks the current flow while still at a low level to protect people from
electrical shock?
a) Heavy duty circuit breaker (HDCB)
b) Ground fault circuit interrupter (GFCI)
c) Heavy duty electrode holder (HDEH)
d) Transformer rectifier silicon diode (TRSD)

Answer 40

b) Ground fault circuit interrupter (GFCI)

Question 41

What method makes welding safe on a vessel that has contained a flammable
substance?
a) Steaming thoroughly and welding while hot and still full of steam
b) Steaming well, then allowing the vessel to cool and dry out
c) Sealing all vents tightly to prevent atmospheric air from getting inside
d) Using a hot water flush, followed by cold water and a drying out period

Answer 41

a) Steaming thoroughly and welding while hot and still full of steam

Question 42

When working in confined spaces, where should cutting torches be ignited and
extinguished?
a) Outside the confined space
b) Inside the confined space
c) Near the confined space
d) Wherever it is most convenient

Answer 42

a) Outside the confined space

Question 43

Before entering a vessel to make repairs, what test should you first insist upon?
a) Leaks in the vessel and piping system
b) Fumes and oxygen deficiency
c) Corrosion or erosion tolerances
d) Blockages in ventilation systems

Answer 43

b) Fumes and oxygen deficiency

Question 44

What is the verified oxygen content before a worker is authorized to enter a confined
space?
a) 7% to 12% by volume
b) 2 psi to 12 psi
c) 19.5% to 23% by volume
d) 24% to 29% by volume

Answer 44

c) 19.5% to 23% by volume

Question 45

Who is responsible for the personal safety of everyone in the shop?
a) Shop supervisor
b) Plant superintendent
c) Individual worker
d) Alberta Occupational Health & Safety

Answer 45

c) Individual worker