Welding and Cutting Test
1) Voltages less than 50 volts: a) can cause fatal shock under all condition, b) cannot cause fatal shock under any conditions, c) can cause fatal shock under some conditions.
2) Arc welding machines are typically greater than 50 volts. T__, F__
3) A person who has wet hands or feet is more susceptible to electrocution than a person who is dry. T__, F__
4) Because metal frames in processing plants are intentionally well-grounded, a person in contact with such a frame while using an arc welder or other electrically-powered tools is much more susceptible to electrocution than one who is not. T__, F__
5) Hazards of arc welding include: a) Electrocution, b) Fires, c) Flesh burns to eyes from UV radiation, d) Burns from sparks, e) Metal fumes, f) Heat-related explosives g) Production of toxic gases when used near cleaning operations using chlorinated hydrocarbons.
6) Hazards of oxy fuel welding include: a) Fires, b) Explosion of oxygen, c) Explosion of acetylene, d) Fire and explosions when gases mix in lines, e) Metal fumes, f)Flash burns to eyes, b) Heat-related explosions.
7) An acetylene cylinder should: a) be transported on its side with the cap on, b) be transported upright with the cap on, c) be stored upright for a few hours prior to using if accidentally laid on its side.
8) Using oxygen to blow off clothing: a) is a fire hazard, b) results in an oxygen-enriched atmosphere in the clothing for some time after.
9) An oxy-acetylene torch: a) cuts steel, b) burns steel
10) Using oil or grease on an oxygen regulator: a) is likely to cause the grease to burn, b) is likely to cause the regulator to burn, c) is likely to cause the cylinder to explode and go airborne.
11) The valve on an oxygen cylinder must be opened: a) ¼ turn, b) ½ turn, c) ¾ turn, d) all the way.
12) What is the highest acceptable secondary gauge pressure on an acetylene regulator?: a) 10psig, b) 15psig, c) 20psig, d) 25psig, e) 50psig
13) Acetylene gas is extremely unstable when compressed. T__, F__.
14) Acetylene cylinders: a) are filled with a porous substance, such as calcium silicate to eliminate pockets of gaseous acetylene of appreciable size, b) have the acetylene dissolved in acetone.
15) Acetone can hold 400 times its own volume of acetylene at a working pressure up to 250 psig. T__, F__.
16) Oxygen and acetylene cylinders must: a) Have the cap when not in use, b) Be secured in the upright position both during storage and use, c) Be protected from being bumped when the regulator is on, d) Be stored at least 20 feet apart or separated by a noncombustible barrier at least five feet high with a fire-resistance rating of at least 1/2 hour.
17) Allowing the pressure inside either cylinder in an oxyacetylene welding system to decrease below 20 psig: a) Is unsafe, b) May result in backflow of the gas from the other cylinder creating an explosive mixture.
18) Allowing the sun to heat a cylinder to 500 degrees F, could a) increase the pressure by over 10 %, b) increase the pressure by over 50 %, c) increase the pressure by over 100 %.
19) Taking oxy-acetylene welding cylinders into a confined space: a) is unsafe, b) could result in leakage of the gas causing a fire and explosion hazard,
20) Oxygen is: a) explosive b) makes everything in an oxygen-enriched atmosphere more flammable.
21) Regulators are required on oxygen and fuel gas cylinders. T__, F__
22) Before a regulator is attached to a cylinder valve: a) the valve should be “cracked” wide open, b) the valve should be opened slightly and immediately closed.
23) Fuel gas hoses are colored red. T__, F__
24) Oxygen hoses are colored green. T__, F__
25) Chemically inactive gas hoses are black. T__, F__
26) Hose clamps are suitable for splicing hoses used in oxy-acetylene welding applications. T___, F__
27) Matches and butane lighters are suitable for lighting a cutting/welding torch. T__, F__
28) When a welder is changing electrodes, he or she should be on a a) conductive, b) nonconductive surface
29) Electrodes should be removed from holders when the welder is turned off. T__, F__.
30) Polyester clothing should a) never b) usually c) always be worn when welding
31) Polyester is: a) flame resistant, b)burns easily, c) melts on your skin increasing the severity of burns.
32) Welding or cutting areas must be: a) water proof, b) wind proof, c) Fire safe
33) You can recognize whether or not fumes from a welding rod are hazardous by: a) looking at the color of the smoke, b) smelling the smoke, c) looking at the Material Safety Data Sheet.
34) Grease and oil must be stored at least a) 5 feet, b) 10 feet, c) 20 feet, d) 40 feet, e) 50 feet from oxygen.
35) Empty fuel gas and oxygen cylinders can be stored together? T__, F__
36) Personal protective equipment for welding or cutting includes: a) eye and face protection, b) skin protection, c) respiratory protection, d) hearing protection.
37) Effective ventilation is a better alternative than respiratory protection in most cases. T__, F__.
38) When personnel leave the confined space, the oxy-acetylene torch and hoses must be removed from the space. T__, F__
Welding and Cutting - Answers & Discussion
1) Voltages less than 50 volts: a) can cause fatal shock under all condition, b) cannot cause fatal shock under any conditions, c) can cause fatal shock under some conditions.
If a person is well-grounded, voltages less than 50 can cause fatal shock.
2) Arc welding machines are typically greater than 50 volts. T__, F__
Welders are typically greater than 50 volts. Well-grounded means wet hands, feet, body in contact with the earth, metal frames etc. (in a plant most metal frames are connected to ground).
3) A person who has wet hands or feet is more susceptible to electrocution than a person who is dry. T__, F__
4) Because metal frames in processing plants are intentionally well-grounded, a person in contact with such a frame while using an arc welder or other electrically-powered tools is much more susceptible to electrocution than one who is not. T__, F__
5) Hazards of arc welding include: a) Electrocution, b) Fires, c) Flesh burns to eyes from UV radiation, d) Burns from sparks, e) Metal fumes, f) Heat-related explosives g) Production of toxic gases when used near cleaning operations using chlorinated hydrocarbons.
6) Hazards of oxy fuel welding include: a) Fires, b) Explosion of oxygen, c) Explosion of acetylene, d) Fire and explosions when gases mix in lines, e) Metal fumes, f)Flash burns to eyes, b) Heat-related explosions.
7) An acetylene cylinder should: a) be transported on its side with the cap on, b) be transported upright with the cap on, c) be stored upright for a few hours prior to using if accidentally laid on its side.
If an acetylene cylinder has been lying on its side, store the cylinder upright for a few hours prior to using it. Tipping the cylinder allows acetone to go into the valve and sufficient time in the upright position must be allowed for the acetone to drain out of the valve.
8) Using oxygen to blow off clothing: a) is a fire hazard, b) results in an oxygen-enriched atmosphere in the clothing for some time afterward.
9) An oxy-acetylene torch: a) cuts steel, b) burns steel
10) Using oil or grease on an oxygen regulator: a) is likely to cause the grease to burn, b) is likely to cause the regulator to burn, c) is likely to cause the cylinder to explode and go airborne.
11) The valve on an oxygen cylinder must be opened: a) ¼ turn, b) ½ turn, c) ¾ turn, d) all the way.
Opening the valve all the way seals the valve so oxygen doesn't leak into the surrounding air and increase the likelihood of a fire.
12) What is the highest acceptable secondary gauge pressure on an acetylene regulator?: a) 10psig, b) 15psig, c) 20psig, d) 25psig, e) 50psig
Never allow the secondary gage pressure to exceed 15 psi. Acetylene is extremely unstable when compressed. Acetylene cylinders are made to safely contain compressed acetylene because the cylinder is filled with a porous material, such as calcium silicate. This eliminates pockets of gaseous acetylene of appreciable size. The acetylene is dissolved in liquid acetone, which can hold 400 times its own volume of acetylene at a working pressure up to 250 psig. The combination of the filler material and the acetone allows the gaseous acetylene to be contained in a stable condition.
13) Acetylene gas is extremely unstable when compressed. T__, F__.
14) Acetylene cylinders: a) are filled with a porous substance, such as calcium silicate to eliminate pockets of gaseous acetylene of appreciable size, b) have the acetylene dissolved in acetone.
15) Acetone can hold 400 times its own volume of acetylene at a working pressure up to 250 psig. T__, F__.
16) Oxygen and acetylene cylinders must: a) Have the cap when not in use, b) Be secured in the upright position both during storage and use, c) Be protected from being bumped when the regulator is on, d) Be stored at least 20 feet apart or separated by a noncombustible barrier at least five feet high with a fire-resistance rating of at least 1/2 hour.
17) Allowing the pressure inside either cylinder in an oxyacetylene welding system to decrease below 20 psig: a) Is unsafe, b) May result in backflow of the gas from the other cylinder creating an explosive mixture.
18) Allowing the sun to heat a cylinder to 500 degrees F, could a) increase the pressure by over 10 %, b) increase the pressure by over 50 %, c) increase the pressure by over 100 %.
This would probably result in the cylinder exploding like a large bomb. Compressed gas cylinders are equipped with safety valves that should release the pressure under these circumstances.
19) Taking oxy-acetylene welding cylinders into a confined space: a) is unsafe, b) could result in leakage of the gas causing a fire and explosion hazard.
An acetylene leak would result in an explosive atmosphere. An oxygen leak would make everything in the space much more flammable. A chemically stable gas such as nitrogen would not be a fire hazard, but would displace the air in the space and could result in insufficient oxygen to breathe.
20) Oxygen is: a) explosive b) makes everything in an oxygen-enriched atmosphere more flammable.
21) Regulators are required on oxygen and fuel gas cylinders. T__, F__
Regulators are required to maintain a controlled, uniform gas supply to the torch at the correct pressure.
22) Before a regulator is attached to a cylinder valve: a) the valve should be “cracked” wide open, b) the valve should be opened slightly and immediately closed.
This is to clear the valve or dust or dirt, which would otherwise get into the regulator.
23) Fuel gas hoses are colored red. T__, F__
24) Oxygen hoses are colored green. T__, F__
25) Chemically inactive gas hoses are black. T__, F__
26) Hose clamps are suitable for splicing hoses used in oxy-acetylene welding applications. T___, F__
Standard fittings must be used for this purpose.
27) Matches and butane lighters are suitable for lighting a cutting/welding torch. T__, F__
The risk of explosion of the butane lighter is too great and the torch is likely to blow out several matches, leading to the ignition of a cloud of fuel gas which could result in burns to the welder. Torches should be lighted by friction lighters, and not by matches, butane lighters, cigarettes or from hot work.
28) When a welder is changing electrodes, he or she should be on a a) conductive, b) nonconductive surface
This is to minimize the probability of electrocution.
29) Electrodes should be removed from holders when the welder is turned off. T__, F__.
True. Otherwise, the electrodes could make electrical contact with employees or conducting objects in the area.
30) Polyester clothing should a) never b) usually c) always be worn when welding.
31) Polyester is: a) flame resistant, b)burns easily, c) melts on your skin increasing the severity of burns.
32) Welding or cutting areas must be: a) water proof, b) wind proof, c) Fire safe
33) You can recognize whether or not fumes from a welding rod are hazardous by: a) looking at the color of the smoke, b) smelling the smoke, c) looking at the Material Safety Data Sheet.
34) Grease and oil must be stored at least a) 5 feet, b) 10 feet, c) 20 feet, d) 40 feet, e) 50 feet from oxygen.
35) Empty fuel gas and oxygen cylinders can be stored together? T__, F__
No. 'Empty' cylinders are never completely empty.
36) Personal protective equipment for welding or cutting includes: a) eye and face protection, b) skin protection, c) respiratory protection, d) hearing protection.
37) Effective ventilation is a better alternative than respiratory protection in most cases. T__, F__.
38) When personnel leave the confined space, the oxy-acetylene torch and hoses must be removed from the space. T__, F__
The torch and hoses must be removed from the space in case there is a leak
