Question

1. which type of material offers the best protection against sparks and molten slag?

a) leather
b) wool
c) nylon
d) cotton

1. 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

1. why is a fit test important when using a respirator?

a) so more than one worker can use it
b) so you look professional on the job
c) to prevent inward leaks of contaminated air
d) so you do not have to shave every day

1. poisonous phosgene gas can be created by vapours of chlorinated hydrocarbon degreasers when the vapours are acted upon by:

a) local or general ventilation.
b) high concentrations of visible light.
c) heavy volumes of fumes.
d) ultraviolet radiation from the welding arc.

1. 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

1. which metal, when heated or welded, can produce metal fume fever if the fumes are inhaled?

a) aluminum
b) zinc
c) chromium
d) cobalt

1. when oxygen reacts with ultraviolet light from welding, the gas produced is:

a) phosphine.
b) nitrogen dioxide.
c) ozone.
d) carbon monoxide.

Explanation:

1. Leather has high heat - resistance and can protect against sparks and molten slag.
2. Dry - tanned leather gauntlet style gloves are suitable for oxyfuel cutting due to their heat - resistance and durability.
3. A fit test for a respirator is important to prevent inward leaks of contaminated air to ensure effective protection.
4. Vapours of chlorinated hydrocarbon degreasers can form phosgene gas when exposed to ultraviolet radiation from the welding arc.
5. Air - purifying respirators use filters and are not safe in oxygen - deficient atmospheres as they rely on ambient air.
6. Inhalation of zinc fumes when heated or welded can cause metal fume fever.
7. When oxygen reacts with ultraviolet light from welding, ozone is produced.

Answer:

1. a) leather
2. c) dry - tanned leather gauntlet style
3. c) to prevent inward leaks of contaminated air
4. d) ultraviolet radiation from the welding arc
5. a) air - purifying
6. b) zinc
7. c) ozone