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WorksheetsP.E.O Unit 24
Total questions: 56
Worksheet time: 2hrs 36mins
What does excessive dross indicate?
Cutting gas set too hig
Excessive oxygen pressure when cutting
Identify the individual parts of the combination set.
Part a
Centre head
Square head
Protractor
Identify the individual parts of the combination set.
Part b
Centre head
Square head
Protractor
Identify the individual parts of the combination set.
Part c
Centre head
Square head
Protractor
What is the function of trammel points in oxy-fuel cutting?
To mark out large diameters and guide cutting torch
To check the diameter of circles after cutting takes place
Acetylene cylinders & regulators have what type of threads?
Left hand thread
Right hand thread
What pressures should gasses be set to when purging the system?
Working pressure
Minimum pressure
What should be carried out after setting up and pressurising and purging the system?
Test for leaks
Light the torch with a gass lighter
Why should the use of oil and grease be avoided when working with oxy-acetylene cutting equipment?
They react with oxygen to form an explosive mixture
They damage the fine screw threads used in oxy-acetylene cutting fittings
Oxy-fuel Handheld cutting torch can usually cut up to 50 mm thick steel plate; while Plasma Gas cutting equipment can cut steel up to ______ mm thickness.
300
400
Which of the following gasses is not a fuel gas?
Oxygen
Acetylene
……………………..are used when there are a large number of components to be checked for overall conformity.
Gauges
Valves
Which oxy-fuel gas produces temperatures of approximately 3200°C?
Acetylene
Methane
Which oxy-fuel gas produces temperatures of approximately 2900°C?
Propylene
Acetylene
Cylinders should be stored in?
Closed container
Well ventilated area
Oxygen cylinders should be stored at least ............meters away from fuel gas cylinders
3
4
What is the color of the hoses used for oxygen for oxy-fuel cutting?
Blue or green
Blue or yellow
What are the color of the hoses for Acetylene?
Red
Orange
What type of regulators are shown?
Oxygen & Acetylene
Propane & Methane
What is the name of the component?
Flashback arrestor
Cuttint torch/blowpipe
What oxy-cutting tool is shown?
Blowpipe / Cutting torch
Cutting nozzle
What type of nozzle is shown?
Cutting
Gauging
Regulators for oxygen have a right
hand screw thread
True
False
Regulators for acetylene have a right
hand screw thread
True
False
Acetylene gas pressure should not exceed?
15 PSI
13 PSI
What does PSI mean?
Pounds per square inch
Pounds per inch
Which type of fire extinguisher is most suitable for oxy-fuel cutting?
Water
Dry powder
What type of oxy-fuel equipment is shown?
Nozzle cleaner / Tip cleaner
Torch cleaner
Wire brush
What is the best item of PPE for protecting your legs and body when using oxy-acetylene cutting equipment?
Safety steel toe boots
Leather apron
Propylene cylinders are identified by:
Silver body with a red shoulder
Red body with green band around middle
Oxygen cylinders are identified by:
Black body with white shoulder
Red body with green band around middle
Acetylene cylinders are identified by:
Black body with white shoulder
Maroon body color
The glasses pictured can be used for protection against oxy-acetylene cutting and arc welding.
False
True
When gas cutting, what type of gloves must you wear when moving steel plates?
Rubber gloves
Gauntlet-leather gloves
With oxy-fuel cutting, there are 3 basic types of flame settings
Neutral
Carburizing
Oxidizing
Live
Which goggle lens is most appropriate for heavy work when oxy-fuel cutting?
Shade 6 GW
Shade 4 GW
Which goggle lens is most appropriate for light work when oxy-fuel cutting?
Shade 6 GW
Shade 4 GW
Arrange the shutting down procedure correctly
a. close fuel gas blow pipe valve
b. close both cylinder valve
c. close oxygen blowpipe valve
d. close oxygen torch valve
e. roll up hose
f. back off fuel gas regulator knob
g. both regulator gauge should show zero pressure
h. back off oxygen regulator knob
i. open oxygen blowpipe valve and allow the gas to drain
out
j. open fuel gas blowpipe valve and allow the gas to drain
out
k. close fuel gas torch valve
a,c,b,i,d,h,j,k,f,g,e
a,b,c,h,d,i,j,k,f,g,e
a,c,b,i,d,h,j,e,g,f,k
Which one of the following is a prefabricated shape that can be used for marking?
Template
Layout
What is a common cause of the top edge being melted when performing oxy-acetylene cutting?
Cutting speed too fast
Cutting speed too slowly
Why should galvanized materials be cleaned prior to using oxy-acetylene cutting equipment?
Flame cannot burn through galvanized coating
Zinc coating gives off toxic fumes
What is used to light the oxy-acetylene torch?
Sprk lighter/ Flint lighter
Gas lighter
What is the metric value of 1 inch
25.4mm
24.5mm
What is 1½ inch thick plate in millimeters?
25.4mm
38.1mm
What is a 19.05-mm plate in inches?
1 Inch
¾Inch
What does Psi stand for?
Pounds per square inch
Pounds per inch
Measuring tapes are accurate up to:
0.1mm
0.5mm
What is the method used for detecting leaks when setting up Oxy-acetylene cutting equipment?
Run hands over fittings to feel for leaks
Use soapy water/leak detector spray
Acetylene cylinders have what type of threads?
Left hand threads - clockwise
Right hand threads - anticlockwise
Oxygen cylinders have what type of threads?
Right hand threads - clockwise
Left hand threads - anticlockwise
The oxy-fuel cutting process can be used to cut steel up to a thickness of:
1500mm
1000mm
Which flame setting is used in oxy-acetylene cutting to cut plate?
Neutral flame with cutting jet open
High flame
Oxidizing flame
Look at the following figures of cut characteristics and defects, and identify a satisfactory cut.
Figure A
Figure B
Look at the following figures of cut characteristics and defects, and identify the cutting speed as being to fast.
Figure A
Figure B
Look at the following figures of cut characteristics and defects, and identify the nozzle as being too far away.
Figure C
Figure D
Look at the following figures of cut characteristics and defects, and identify too much or excess oxygen.
Figure C
Figure D
