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Question 1: According to Decree 44/2016/ND-CP, which of the following subjects are required to attend occupational safety and hygiene training courses?

a. Employees working at the unit.

b. Workers doing jobs with strict requirements on safety and occupational hygiene.

c. Apprentices, trainees, probationary workers.

d. Both sentences (a and b) are correct.

e. All three sentences (a, b, c) are correct.

Question 2: According to Law No. 84/2015/QH13, regarding occupational safety and hygiene, how many rights and obligations do employees working under labor contracts have?

a. 03 rights and 03 obligations.

b. 06 rights and 03 obligations.

c. 04 rights and 07 obligations.

d. 03 rights and 07 obligations

e. Workers have no rights to occupational safety and hygiene.

Question 3: The purpose of labor protection work is:

a. Protect the life and physical integrity of workers; prevent workers from occupational accidents and diseases during the production process.

b. Reduce health loss to ensure working days and hours, maintain and sustain long-term health to work with high productivity and good quality.

c. To save costs for employers and employees.

d. Both sentences (a and b) are correct.

e. All three sentences (a, b, c) are correct.

Question 4: State safety measures when welding at height:

a. There must be scaffolding, sturdy working floors, protective railings, and safety belts for workers.

b. There must be warning signs, someone must be on duty at the equipment, and construction tools must be put in bags.

c. Both sentences (a, b) are correct.

d. Both sentences (a, b) above are wrong.

Question 5: Causes of electrical accidents when performing electric welding work:

a. Damaged insulation of electrical equipment transmits electricity to the metal.

b. Do not cover, fence, or electrically live parts.

c. Lack of electrical safety measures: grounding, air connection...

d. Violation of electrical safety distance, especially for high voltage.

e. Lack of safe labor protection equipment.

f. Sentences a, b, c are correct.

g. Sentences a, b, c, d, e are correct.

Question 6: When welding near places containing flammable materials, what measures should be taken?

a. When near flammable materials, the minimum safe distance is 5m.

b. When near flammable fuels (gasoline, oil, gas, etc.), the minimum distance is 10m.

c. Cover the welding area from flammable areas, have a fire prevention and fighting plan approved by competent authorities, arrange fire fighting equipment and forces during construction.

d. All three sentences above are correct.

Question 7: When should the welding machine be turned off?

a. When stopping welding or when busy with work, you must leave the welding position.

b. When the welding machine breaks down during operation.

c. When cleaning the machine, moving the welding machine and the work area.

d. All three sentences above are correct.

Question 8: What proactive measures should be taken to prevent electrical accidents while welding?

a. Do not let your hands touch the two phases of the power source.

b. Electric welding equipment must be grounded.

c. Safe secondary voltage in dry climate is 36 volts, in wet climate is 12 volts

d. Install an automatic circuit breaker for the welding equipment so that when the welding rod comes into contact with the welding object, the circuit breaker will close the circuit and vice versa, when the welding stops, the circuit breaker will cut off the circuit.

e. It is not allowed to turn on/off the power, adjust, assemble and repair welding equipment.

f. When welding in tanks, tunnels, compartments, or closed tanks, use portable lamps with a voltage not greater than 12 volts with a protective net, or use directional lamps to illuminate from the outside and arrange for a supervisor.

g. Use full personal protective equipment.

h. All of the above sentences (a, b, c, d, e, f, g) are correct.

Question 9: When using a portable welding machine, what should be done with a manual arc welder?

a. The length of the wire between the power grid and the welding machine is not greater than 10 meters.

b. Braided (winded) and using conductors with damaged insulation or exceeding the specified time.

c. When welding outdoors above the welding machine, there is no need for a roof. When it rains, it must stop immediately.

d. All three sentences above are correct.

Question 10. When cutting metal with an oxy-acetylene (gas) flame, what must be done?

a. Clean rust, paint, grease and other dirt on the metal surface to be cut, use a cloth soaked in kerosene to wipe off oxy-acetylene (gas) before welding.

b. Place the metal sheet to be cut 300 – 500 mm above the ground.

c. Carefully check the oxygen cylinder, acetylene cylinder (or gas cylinder), pressure relief valve and select the appropriate torch number for the metal thickness.

d. All three sentences (a, b, c) are correct.

Question 11: Causes of oxygen cylinder explosion

a. The cylinder has expired the circulation date of the state inspection agency on labor safety.

b. Grease sticks to the pressure relief valve - bottle throat.

c. Sparks at the mouth of the bottle, strong impact, placing in a place with high temperature.

d. All three sentences above are correct.

Question 12: List the preparation work when using an oxygen cylinder for work:

a. Remove the protective cap, unscrew the connecting tube nut and check for grease? Blow the connecting tube to the stop valve, install the pressure reducing valve to the bottle head valve and adjust the oxygen pressure accordingly.

b. Install the pressure reducing valve with the valve of the bottle head, then adjust the oxygen pressure accordingly.

c. Both of the above sentences are wrong.

Question 13: To ensure safety of the "Fire swallowing" phenomenon, what is needed?

a. Install an “anti-backfire” valve at the torch end of the acetylene (gas) supply pipe and before the pressure reducing valve of the acetylene (gas) cylinder.

b. Bend the pipe near the pressure reducing valve, quickly close the oxygen cylinder head valve.

c. Both of the above sentences are correct.

Question 14: Basic safety rules when using pressure reducing valves:

a. Must have all accurate gauges, valves must be sealed and have passed safety inspection.

b. Do not let grease get on the valve (especially the oxygen valve).

c. Open the gas slowly, avoid sudden movements, the joints between the valve and the bottle must be completely sealed.

d. All three sentences above are correct.

Question 15: Describe the operation of turning the light on and off when using a suction-type welding (cutting) lamp:

a. Open the oxygen valve first, then open the acetylene ignition valve; when turning off, turn off the oxygen valve first, then the acetylene valve.

b. Open the oxygen valve first, then open the acetylene ignition valve; when turning off the acetylene valve, turn it off first, then the oxygen valve.

c. Open the acetylene valve first, then open the oxygen ignition valve; when turning off, turn off the oxygen valve first, then the acetylene valve.

d. Open the acetylene valve to ignite the flame first, then open the oxygen valve to adjust the flame; when turning off the oxygen valve, turn it off first, then the acetylene valve.

Question 16: When using a gas cylinder to cut metal, what should we pay attention to?

a. Check if the bottle's expiry date is still valid?

b. Are the cylinder head valve and safety valve still complete and tight?

c. When using a gas cylinder, it is only allowed to be placed vertically.

d. Place the gas cylinder in any direction.

e. Do not place in sunlight or places with temperature >400C.

f. Check the external geometric shape of the bottle for defects?

g. Sentences a, b, c, e, f are correct.

h. Sentences a, b, c, d, e, f are correct.

Question 17: When welding and cutting with oxy-acetylene (or gas) flame in a closed tunnel, what should be done?

a. The concentration of toxic gas in the tunnel must be surveyed.

b. There must be someone on duty at the tunnel entrance, and fans must be installed to ventilate welding and cutting fumes.

c. Lighting voltage not exceeding 12V

d. It is not allowed to light a fire more than three (03) times.

e. There must be at least 02 people working in the tunnel.

f. Limit welding time (after a certain period of time, take a break for ventilation)

g. Sentences a, b, d, e are all correct.

h. Sentences a, b, c, d, e, f are all correct.

Question 18: When performing first aid for a victim of an electrical accident, you must:

a. Take the victim to a cool place, loosen clothes and belt, clean out phlegm and foreign objects in the victim's mouth, and notify the nearest medical facility.

b. Place the victim in the correct position, then use or combine one of the following measures: - Mouth-to-mouth resuscitation - External cardiac massage

c. Both of the above sentences are correct.

Question 19: First aid for victims of electric shock ends when

a. After 30 minutes from the start of emergency.

b. Saw the victim had stopped breathing.

c. After consulting with medical staff.

Occupational Safety Multiple-Choice Test for Metal Welding and Cutting

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