Module - Oxy-Fuel Equipment & Procedures Part A

Question 1

What class of fire extinguisher would you use for a wood and paper fire?

Answer 1

Class A - Wood & Paper (Ash)

Question 2

What class of fire extinguisher would you use for a flammable liquids fire?

Answer 2

Class B - Flammable Liquids (Barrel)

Question 3

What class of fire extinguisher would you use for an electrical fire?

Answer 3

Class C - Electrical (Current)

Question 4

What class of fire extinguisher would you use for a combustable metals fire?

Answer 4

Class D - Combustable Metals

Question 5

A new cylinder of Oxygen is fully charged to _____ psi at 70 degrees F (21 degrees C)

Answer 5

2200 PSI

Question 6

Acetylene gas is highly flammable, and the explosive mixture of acetylene in air ranges from ___% to ___%.

Answer 6

2.5 & 80

Question 7

The critical point of acetylene is ___PSI

Answer 7

28 PSI

Question 8

The maximum safe working pressure (MSWP) for acetylene is ___PSI

Answer 8

15 PSI

Question 9

The melting temperature of the fusible plug in an acetylene tank is ___ degrees Celsius.

Answer 9

100

Question 10

When welding with a size 3 tip, your acetylene should be set to ___PSI and your oxygen set to ___PSI.

Answer 10

3 & 3

Question 11

When cutting with acetylene your acetylene pressure should be at ___PSI and your oxygen pressure at ___PSI.

Answer 11

Acetylene - 5 PSI

Oxygen - 25 PSI

Question 12

Goggles are worn when cutting and brazing to protect the eyes from:

a) light rays.
b) heat rays.
c) sparks and slag.
d) all of the above.

Answer 12

d) all of the above.

Question 13

What is the best type of clothing used for brazing and cutting?

a) cotton
b) rayon
c) leather
d) denim

Answer 13

c) leather

Question 14

The most suitable footwear for cutting and brazing is:

a) shoes.
b) safety shoes.
c) boots.
d) high-top leather safety boots.

Answer 14

d) high-top leather safety boots.

Question 15

What three elements are necessary for a fire to occur?

a) heat, air, oxygen
b) fuel, heat, oxygen
c) fuel, air, oxygen
d) heat, fuel, gas

Answer 15

b) fuel, heat, oxygen

Question 16

Which type of fire extinguisher should be used on a Class C fire?

a) wet blanket
b) soda acid
c) water pump tank
d) dry chemical

Answer 16

d) dry chemical

Question 17

What is the purpose of the disc that is mounted on one side of the oxygen cylinder valve?

a) the disc identifies the type of gas in the cylinder
b) it is designed to rupture in an emergency at 4000 psi
c) this safety device is designed to rupture at 4200 psi from extreme pressure caused by heat
d) this rupture disc is a safety device designed to burst at 3200 psi and allow a slow, controlled escape of gas

Answer 17

d) this rupture disc is a safety device designed to burst at 3200 psi and allow a slow, controlled escape of gas

Question 18

When oxygen is being used the cylinder valve should be opened:

a) fully.
b) 2 turns.
c) 1 turn.
d) 1 turns.

Answer 18

a) fully.

Question 19

The maximum safe working pressure for acetylene is:

a) 28 psi.
b) 70°F.
c) 15 psi.
d) 21°C.

Answer 19

c) 15 psi.

Question 20

What does the term draw limit mean?

a) the maximum amount of oxygen that can be used per hour
b) the maximum amount of acetylene that can be used per day
c) the ability of an apprentice to draw and sketch
d) the maximum amount of acetylene that can be drawn from the cylinder without drawing liquid acetone

Answer 20

d) the maximum amount of acetylene that can be drawn from the cylinder without drawing liquid acetone

Question 21

Fusible plugs in acetylene cylinders are located:

a) in the side of the cylinder.
b) on the shoulder and bottom of the cylinder.
c) in the acetone.
d) in the regulator.

Answer 21

b) on the shoulder and bottom of the cylinder.

Question 22

The acetylene cylinder must be used:

a) in a vertical position.
b) in a horizontal position.
c) at 45 degrees.
d) at 70 degrees.

Answer 22

a) in a vertical position.

Question 23

What colour is the acetylene hose used with oxyacetylene equipment?

a) red
b) green
c) orange
d) purple

Answer 23

a) red

Question 24

13. Testing for leaks on oxyacetylene equipment should done with:
    a) an open flame.
    b) a striker.
    c) leak detection fluid.
    d) a water hose.

Answer 24

c) leak detection fluid.

Question 25

The function of a regulator in oxyacetylene equipment is to:

a) maintain a fluctuating delivery pressure.
b) reduce cylinder pressure to working pressure.
c) reduce working pressure to cylinder pressure.
d) maintain a fluctuating delivery pressure regardless of the pressure changes at the source.

Answer 25

b) reduce cylinder pressure to working pressure.