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Question 1: According to Decree 44/2016/ND-CP, the time limit for issuing and re-issuing occupational safety and hygiene cards

a. 01 year.

b. 02 years.

c. 03 years.

d. 05 years.

e. Unlimited.

Question 2: The elements that create a normal fire are

a. Oxygen.

b. Combustible substances

c. Sufficient heat source, oxidizer

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

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

Question 3: Pressure equipment operators have the right to refuse to operate the equipment when they see

a. The device lacks a safety valve.

b. The device lacks a pressure gauge.

c. The device lacks a bottom drain valve.

d. Missing pressure relay.

e. Sentences (a, b) are correct.

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

Question 4: The pressure gauge on the pressure equipment must

a. Annual calibration and inspection.

b. Periodic calibration and inspection every 2 years.

c. Periodic calibration and inspection every 3 years.

d. Sentences (a, b, c) are all correct.

Question 5: When the pressure in the electric boiler exceeds 1.1 times the allowable pressure and the safety valve does not operate, the worker must operate

a. Turn off the power and notify the person in charge or supervisor.

b. Turn off the power, release the pressure in the device to a safe pressure, find out the cause to repair or notify the person responsible for repair.

c. Release some pressure and then continue operating.

Question 6: The person assigned to directly operate the boiler is responsible for

a. Regularly check the condition of the tank, the operation of the testing and measuring instruments, the safety mechanisms and the tank's spare parts.

b. Operate the tank safely according to the issued operating procedures; promptly and calmly handle incidents according to the unit's procedures when they occur, and immediately report any unsafe phenomena of the tank to the person in charge and record them in the operating log.

c. Use personal protective equipment as prescribed.

d. Adjust the tank protection device parameters during operation and during the operating cycle.

e. Only statements a, b and c are correct (statement d is incorrect).

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

Question 7: The boiler has a working pressure of 6.0 bar, is equipped with 01 safety valve and 01 pressure relay to cut off the pressure supply, we must adjust the working mechanism as follows

a. Safety valve discharges at 6.0 bar pressure, pressure relay cuts off at 6.6 bar.

b. Safety valve discharges at 6.6 bar pressure, pressure relay disconnects at 6.0 bar.

c. Safety valve discharges at 6.6 bar pressure, pressure relay cuts off at 6.6 bar.

d. Safety valve discharges at 6.0 bar pressure, pressure relay cuts off at 6.0 bar.

Question 8: According to Decree 44/2016/ND-CP, what is the minimum initial training time for group 3?

a. Total training time is at least 16 hours

b. Total training time is at least 24 hours

c. Total training time is at least 48 hours

d. Total training time is at least 56 hours

Question 9: The possible cause of the explosion of the pressure part of the boiler is due to

a. The pot is seriously out of water.

b. The pot is too clogged with scale.

c. Boiler metal is corroded or defective.

d. Explosion due to the explosion of the gas mixture in the combustion chamber.

e. All four sentences above (a, b, c, d) are correct.

Question 10: In which of the following cases must the boiler be stopped immediately?

a. When the water level in the pot falls below the lowest allowable level.

b. When there is a leak at the joints and welds in the pressure-bearing parts of the boiler.

c. When the pressure gauge is damaged and there is no tool to check the pressure inside the boiler.

d. When the safety valve is damaged or missing.

e. All four cases above (a, b, c, d) must stop the accident.

f. Sentences (a, b, c) are correct

Question 11: The cause of the boiler explosion is (the boiler is equipped with a pressure gauge, safety valve and pressure relay)

a. Intentionally operating the cooker beyond the allowable pressure.

b. The safety valve does not discharge when the pressure in the boiler exceeds 1.1 times the maximum allowable working pressure or the steam release capacity of the safety valve is less than the capacity of the boiler.

c. The boiler is dry or the boiler metal is corroded.

d. All three sentences above are correct.

e. Only statements a and c are correct (statement b is incorrect).

Question 12: The cause of damage to boiler metal is due to

a. Metals are oxidized by contact with oxygen in the air or by oxidation by oxygen dissolved in water.

b. Boiler metal is corroded by electrochemistry (corrosion due to the exchange of metal ions with ions of salts dissolved in water).

c. Boiler metal is deformed due to excessive heating.

d. Boiler metal cracks and deforms due to metal expansion that occurs frequently during use.

e. All four sentences above are correct.

f. Only statements a, b and c are correct.

Occupational Safety Multiple-Choice Test for Working with Boilers

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