Oxy-fuel Gas Cylinders and Equipment Section 4

Question 1

With RENTED cylinders, who is responsible for cylinder maintenance?

a. Employee
b. Employer
c. Supervisor
d. Supplier

Answer 1

d. Supplier

Question 2

Where do oxygen and fuel gases typically come from?

a. Gas stations
b. Gas cylinders
c. Gas pipelines
d. Gas generators

Answer 2

b. Gas cylinders

Question 3

What should be done if any noticeable damages or faults are observed in a rented gas cylinder?

a. Ignore them
b. Report them to the manufacturer
c. Report them to the user’s employer
d. Report them to the supplier

Answer 3

d. Report them to the supplier

Question 4

What is the typical pressure at which oxygen is supplied in compressed gas cylinders?

a. 10,000 kPa (1,450 psi)
b. 15,000 kPa (2,175 psi)
c. 18,000 kPa (2,600 psi)
d. 20,000 kPa (2,900 psi)

Answer 4

c. 18,000 kPa (2,600 psi)

Question 5

What is the range of capacities for oxygen cylinders in compressed form?

a. 0.1 m^3 - 1.0 m^3 (5 ft^3 - 50 ft^3)
b. 1.0 m^3 - 5.0 m^3 (50 ft^3 - 250 ft^3)
c. 0.5 m^3 - 9.35 m^3 (20 ft^3 - 335 ft^3)
d. 10 m^3 - 20 m^3 (500 ft^3 - 1000 ft^3)

Answer 5

c. 0.5 m^3–9.35 m^3 (20 ft^3 - 335 ft^3)

Question 6

Which two types of large-size oxygen cylinders are commonly used in industry?

a. A-type and B-type
b. T-type and K-type
c. X-type and Y-type
d. M-type and N-type

Answer 6

b. T-type and K-type

Question 7

What is the capacity of a T-type oxygen cylinder in compressed form?

a. 7 m^3 (244 ft^3)
b. 9.35 m^3 (335 ft^3)
c. 5 m^3 (177 ft^3)
d. 10 m^3 (354 ft^3)

Answer 7

b. 9.35 m^3 (335 ft^3)

Question 8

What is the capacity of a K-type oxygen cylinder in compressed form?

a. 7 m^3 (244 ft^3)
b. 9.35 m^3 (335 ft^3)
c. 5 m^3 (177 ft^3)
d. 10 m^3 (354 ft^3)

Answer 8

a. 7 m^3 (244 ft^3)

Question 9

At what pressure is oxygen compressed in a K-type cylinder, measured in both MPa and psi?

a. 10 MPa (1450 psi)
b. 15 MPa (2200 psi)
c. 20 MPa (2900 psi)
d. 25 MPa (3625 psi)

Answer 9

b. 15 MPa (2200 psi)

Question 10

What is the temperature at which the T-type oxygen cylinder is compressed?

a. 10°C
b. 15°C
c. 21°C
d. 25°C

Answer 10

c. 21°C

Same are K-type

Question 11

What is the temperature at which the K-type oxygen cylinder is compressed?

a. 10°C
b. 15°C
c. 21°C
d. 25°C

Answer 11

c. 21°C

Same as T-type

Question 12

What material are high-pressure oxygen cylinders typically made of?

a. Aluminum
b. Copper
c. High-carbon steel
d. Plastic

Answer 12

c. High-carbon steel

Question 13

What is the minimum thickness of the walls of high-pressure oxygen cylinders?

a. 3 mm (1/8 in)
b. 4 mm (3/16 in)
c. 5 mm (1/5 in)
d. 6 mm (1/4 in)

Answer 13

d. 6 mm (1/4 in)

Question 14

How are threaded collars fitted for high-pressure oxygen cylinders?

a. Weld-fitted
b. Thread-fitted
c. Compression-fitted
d. Bolt-fitted

Answer 14

c. Compression-fitted collar

Question 15

What type of collars do high-pressure oxygen cylinders have?

a. Welded collar
b. Screwed collar
c. Compressed collar
d. Threaded collar

Answer 15

d. Threaded collar

Question 16

How does temperature affect the gas pressure within the oxygen cylinder?

a. It has no effect
b. Gas pressure increases when heated and decreases when cooled
c. Gas pressure decreases when heated and increases when cooled
d. Gas pressure remains constant regardless of temperature changes

Answer 16

b. Gas pressure increases when heated and decreases when cooled

Question 17

What material is typically used to fabricate the high-pressure oxygen cylinder valve?

a. Steel
b. Aluminum
c. Forged brass
d. Copper

Answer 17

c. Forged brass

Question 18

What covers the high-pressure oxygen cylinder valve when the cylinder is not in use?

a. Rubber seal
b. Protective cap
c. Metal latch
d. Plastic sleeve

Answer 18

b. Protective cap

Question 19

What type of construction does the oxygen cylinder valve have to prevent oxygen leaking around the stem?

a. Single-seal
b. Double-seal
c. Triple-seal
d. No seal

Answer 19

b. Double-seal

Question 20

What stops oxygen from coming out of the cylinder when the oxygen cylinder valve is closed?

a. Oxygen flow seal
b. Stem seal
c. Back seating seal
d. Valve handle

Answer 20

a. Oxygen flow seal

Question 21

What stops oxygen from going up the valve stem when the oxygen cylinder valve is fully open?

a. Oxygen flow seal
b. Stem seal
c. Back seating seal
d. Valve handle

Answer 21

c. Back seating seal

Question 22

In which direction should the valve wheel be turned to open the oxygen cylinder valve?

a. Clockwise
b. Counterclockwise
c. Upwards
d. Downwards

Answer 22

b. Counterclockwise

Question 23

What could happen if the oxygen cylinder valve is suddenly opened?

a. The cylinder may explode
b. The valve may jam
c. The regulator may burst
d. The valve may leak

Answer 23

c. The regulator may burst

Question 24

Why should the valve be opened slowly?

a. To conserve oxygen
b. To reduce noise
c. To prevent stress on the pressure regulator
d. To increase gas flow

Answer 24

c. To prevent stress on the pressure regulator

Question 25

What safety device is equipped on high-pressure oxygen cylinder valves?

a. Hexagonal nut
b. Safety disk
c. Capped nut
d. Vent holes

Answer 25

b. [a burstable] safety disk

Question 26

What is the purpose of the burstable safety disk inside the safety nut?

a. To release oxygen
b. To evenly distribute pressure
c. To seal the cylinder valve
d. To prevent leaks

Answer 26

a. To release oxygen

Question 27

At what pressure does the specially designed safety disk rupture?

a. 27,000 kPa (4,000 psi)
b. 4,000 kPa (580 psi)
c. 27 MPa (3,900 psi)
d. 4 bar (58 psi)

Answer 27

a. 27,000 kPa (4,000 psi)

Question 28

What happens if the safety disk ruptures?

a. Oxygen is released through the hexagonal nut
b. The cylinder valve is sealed shut
c. The cylinder becomes pressurized
d. The hexagonal nut expands

Answer 28

a. Oxygen is released through the hexagonal nut

Question 29

What first action should be taken if a faulty cylinder valve or ruptured safety disk is found?

a. Replace the safety disk
b. Move the cylinder to a closed area
c. Move the cylinder to an open area and tag it
d. Notify the supplier for immediate pick up

Answer 29

c. Move the cylinder to an open area and tag it

Question 30

What precaution should be taken regarding lubricants and oxy-fuel gas equipment?

a. Too little lubricant won’t enhance the performance of oxy-fuel gas equipment.
b. Lubricants must be applied sparingly to ensure sealing.
c. Lubricants can catch fire or explode in the presence of compressed oxygen.
d. Lubricants are necessary for proper maintenance of oxy-fuel gas equipment.

Answer 30

c. Lubricants can catch fire or explode in the presence of compressed oxygen.