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Self Tests Flashcards

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1
Q

——— is not a fuel gas?
Natural gas
MAPP gas
Oxygen gas
Acetylene gas

A

Oxygen Gas

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2
Q

Which gas has the highest flame temperature?
Acetylene gas,
Propane gas
MAPP gas
Natural gas

A

Acetylene gas

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3
Q

What is the first step in putting out a fire in the hoses of an oxyacetylene outfit?
- Use a fire extinguisher on the hoses
- close only the acetylene cylinder valve
- close only the oxygen cylinder valves
- close both the oxygen and acetylene cylinder valves

A

Close both the oxygen and acetylene cylinder valves

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4
Q

You should never lubricate regulators or parts of the torch
- true
- false

A

True

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5
Q

One of the quickest ways to tell if an acetylene hose has a leak in it

A

Smell in the air, acetylene has a strong, pungent odour

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6
Q

The critical point of free acetylene is ____ psi (____kPa) at 21 degrees Celsius; if the temperature increases, the pressure becomes critical at a _____ pressure

A

28 psi
193 kPa
Lower

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7
Q

The acetylene fittings are made of _____________, to prevent a fire or possible explosion from happening.
A. Copper or red brass.
B. Steel iron or yellow brass.
C. Red brass or steel
D. Iron red, brass or yellow brass.

A

B. Steel, iron, or yellow brass (yellow brass preferred)

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8
Q

The fuel gas not shipped in liquid form for welding is?
A. Oxygen.
B. MAPP
C. Propane.
D. Natural gas.

A

D. Natural Gas

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9
Q

Why is acetylene gas dissolved in liquid acetone and shipped in cylinders filled with a porous filler?

A

Acetone keeps acetylene from reaching its critical point.

Acetone dissolves acetylene, and allows more acetylene to be stored at a higher pressure

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10
Q

According to the OHS regulation, compressed oxygen gas can be only be used to:
A. Operate a pneumatic
B. Accelerate combustion of fuel gases.
C. Start an internal combustion engine.
D. Ventilate a workplace.

A

B. Accelerate combustion of a fuel gases

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11
Q

The occupational health and safety regulation require that the device required for closing the valve on acetylene cylinder must be:
A. Immediately available, close to the cylinder itself.
B. Immediately available, at the nearest tool crib.
C. Within 50 m of the cylinder.
D. Within 100 m of the cylinder.

A

A. Immediately available, close to the cylinder itself.

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12
Q

Containers used for shipping compressed gases are called?

A

Cylinders

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13
Q

Cylinders are withdrawn from service at the slightest indication of

A

Damage

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14
Q

The pressure in a full oxygen cylinder at 21°C is

A

2200 psi

15 mPa

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15
Q

The safety device in oxygen cylinder valve is _______ activated?

A

Pressure

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16
Q

What are three things you should do if a cylinder valve is damaged?

A

A. Tag cylinder to indicate fault.
B. Move to a ventilated/ open area
C. Notify supplier for pick up.

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17
Q

Acetylene cylinders must be upright to prevent _______ plugging the equipment

A

Acetone

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18
Q

Free acetylene is dangerous when stored at pressures above?

A

15 psi
103 kPa

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19
Q

The safety devices on an acetylene cylinder are ______ activated?

A

Heat - fusible links at top and bottom of cylinder

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20
Q

Oxygen cylinders are opened __________
Acetylene cylinders are opened ________

A

Oxygen cylinders are opened all the way

Acetylene cylinders are opened a 1/4 to 1/2 turn

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21
Q

Manifold systems are used to increase ___________ of acetylene.

A

Draw limit for a large job

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22
Q

Liquid fuel cylinders are designed to allow the liquid to ___________ when the cylinder valve is opened and gas escapes

A

Evaporate, boil

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23
Q

When cylinders are too low on gas to be used, they should be marked _______?

A

M.T.

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24
Q

Cylinder valves should always be __________ open momentarily before the regulator is attached and ______ when your work is finished.

A

“Cracked” open

Closed

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25
To prevent them from tipping over, cylinders must be __________.
Securely fastened to a stationary object
26
A _____________ must always cover the cylinder valve when a cylinder is stored or transported, full or empty
Cylinder valve cap, protective cap
27
Oxygen cylinders and cylinder valve fittings should never be exposed to?
Petroleum products, oil, gas, grease, cleaning solvents, paints
28
Cylinders should only be hoisted in a ___________?
Cradle or box
29
The oxygen cylinder valve is more complex than an acetylene cylinder valve because it is designed to operate at _______ pressure
Higher
30
Each type of fuel gas requires a different regulator A. True. B. False.
True
31
All oxygen regulators have __________ hand threads
Right hand
32
The gauge with the highest numerical calibration indicates _________ pressure
Cylinder
33
The gauge with the lower numerical calibration indicates ________ pressure
working pressure
34
To increase the working pressure, the pressure adjusting screw is turned _________?
Clockwise
35
The red line on the _______ gauge is a warning sign of unsafe conditions.
Acetylene working pressure
36
A grooved hex nut indicates a ________ regulator?
Acetylene
37
Oxygen pressure gauges are usually calibrated from zero to ________ psi
4,000 psi
38
Acetylene pressure gauges are usually calibrated from zero to ________ psi
400 psi
39
The maximum safe working pressure for acetylene is _______ psi _____ kPa
15psi 103 kPa
40
Regulator should be placed in a _________ when storing or transporting, to prevent damage.
box, suitable clean container
41
Regulator should never be exposed to?
petroleum products, oil, gas, grease, solvent cleaners, paint.
42
A __________ with a cutting attachment and welding tip replaces a cutting torch and a welding torch
Combination torch handle
43
The amount of oxygen and fuel gas entering the torch is controlled by
Separate torch stem valves
44
A RFCV placed between the torch and hose has the arrow pointing toward the _______; between the hose and the regulator, it is pointing towards the _____?
Torch Hose
45
When you are using the combination torch for the cutting process, the __________ valve is used to adjust the amount of oxygen mixed with acetylene for preheating
Preheat oxygen
46
If a flashback occurs, the _______ and ________ valves must be shut down as soon as possible.
Torch and Cylinder valves
47
Two types of torch line explosions are?
Backfire Flashback
48
The safety device is attached between the torch handle and hose; and the hose and the regulator are called?
RFCV - reverse flow check valve
49
A RFCV allows, oxygen or fuel gas to flow ________; the direction is indicated by an ___________ marked on the RFCV
One direction Arrow
50
After a torch line explosion has occurred, and the equipment has been repaired. You must ________ the lines before you adjust and light the gases.
Purge
51
The colour of an oxygen hose is usually?
Green or black
52
The colour of the fuel gas hose is usually?
Red
53
All oxygen fittings have a ______ hand thread
Right
54
All fuel gas nuts are _______ and ________ hand threaded
Grooved Left hand
55
OXY – fuel gas hose is reinforced with a strong ________ between the layers of rubber
Fabric
56
All oxy-fuel fittings and connecters used in the hook up of hoses are made of ________ to, prevent Sparks, corrosion, and dangerous gases from forming.
Yellow brass alloy
57
Faulty hose or fittings caused serious __________ ?
Fire and explosions
58
After you have finished using them, what 3 things to the hose should be done ____________ to prevent damage.
Coiled, tied up, stored out of sunlight
59
To prevent tipping or jarring, oxyacetylene cylinders are secured to a portable cart with _______.
Light duty chain
60
Cylinder valves are protected from damage with _______
Cylinder protection caps
61
Quickly opening and closing cylinder valves to remove foreign particles from inside the valves is called ________ the valves
Cracking
62
Not only must you know the direction of the gas flow, but also the kind of _________ when you are choosing the RFCV for the torch handle or regulator.
Gas/ fuel. Oxygen equals right hand threads Fuel equals left-hand threads
63
When you turn the pressure adjusting screw on the regulator all the way out, it __________ the regulator.
Closes
64
The lines are said to be ________ when the cylinder valves are open, working pressures are set, and the torch valves are closed.
Pressurized
65
An acetylene cylinder valve outlet for the regulator is left hand threaded, and __________ threaded as an extra precaution against improper set up
Internally
66
An oxygen cylinder valve outlet for the regulator is right hand threaded, and ____________ threaded as an extra precaution against improper set up
Externally
67
Before you let a torch, you should always check for _________ in the lines.
Leaks
68
Never use __________ near the equipment when testing for leaks
Oil products or flame
69
The only thing that should be used to create a spark for lighting a torch is a
Striker, 25mm from tip
70
A flamed which has an excessive amount of acetylene compared to a neutral flame is called _______ flame
Carburized
71
When oxygen is added to the acetylene flame, the flame changes colour from
yellow red to blue
72
Name three types of oxyacetylene flame that can be produced
Neutral Oxidizing Carburizing
73
When shutting down the flame, first close the ______ torch valve
Acetylene
74
Releasing gas to reduce pressure in the system by closing the cylinder valve and opening the torch valve is called ________
Bleeding
75
When disassembling an oxyacetylene outfit, it is important to store all components, where they will not come in contact with?
Oil, grease or dirt
76
________ must be used to prevent damaging the cylinder valves, even when a cylinder is empty
Protective caps
77
When cylinders are empty, they should be clearly marked with the letters _______ and stored separately from the full ones
M T
78
What a flame burns the steel and causes metal to foam and spark. It has an excessive amount of ____________, compared to a neutral flame
Oxygen
79
Before lighting a torch after the outfit has been shut down, ____________ the lines to clear out any explosive mixtures that may have developed
Purge
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