WorksheetsCommon plumbing processes part 2
Total questions: 47
Worksheet time: 24mins
What is the tool shown in the image used for?
Cutting metal sheets
Drilling holes
Bending tubes
Welding joints
What color is associated with heavy grade tubes used in steam and fire systems?
Blue
Brown
Red
Green
Which grade of tubes is used for gas applications?
Heavy
Medium
Light
Extra Heavy
What is the primary use for medium grade tubes?
Gas
Steam and fire systems
Heating and oil lines
Water supply
What is commonly used to secure LCS in position?
Bolts
Clamps
Munson rings
Screws
What is the composition of LCS?
99.85% iron and 0.15% carbon
98% iron and 2% carbon
95% iron and 5% carbon
90% iron and 10% carbon
How are diameters and lengths measured for LCS?
Metric for both
Imperial for both
Imperial for diameters and metric for lengths
Metric for diameters and imperial for lengths
What type of joints can be used for LCS?
Threading, welding, and special compression joints
Soldering, gluing, and riveting
Bolting, nailing, and stapling
Clamping, screwing, and pinning
What materials are used to seal the threads of LCS?
PTFE, red paste, and hemp
Glue, tape, and rubber
Wax, oil, and silicone
Cement, clay, and sand
Which protection method is applied both inside and outside of tubes?
Denso tape
Paint
Galvanized
Chemical
Which protection method is applied only on the inside of tubes?
Chemical
Paint
Denso tape
Galvanized
What is the function of the pump handle in a tube bending machine?
To provide leverage for bending
To measure the tube length
To cut the tube
To heat the tube
Which part of the tube bending machine is responsible for applying pressure to bend the tube?
Air inlet
Hydraulic cylinder
Location lugs
The frame
What is the purpose of the location lugs in a tube bending machine?
To secure the tube in place
To measure the angle of bend
To release air pressure
To cut the tube
What happens to a tube when it is bent?
It stretches in one direction.
It compresses in both directions.
It stretches in both directions.
It remains unchanged.
What is the stretch of LCS for a nominal bore of ½ inch?
10mm
15mm
20mm
25mm
What is the primary use of an engineers square?
Bending tubes
Measuring angles
Ensuring right angles
Cutting metal
In modern commercial LCS fabrication, what is commonly used instead of bending?
Fittings
Welding
Casting
Molding
In the context of measuring and bending tubes, what are Z dimensions identical to in copper?
Y dimensions
X dimensions
W dimensions
V dimensions
Where are all Z dimensions referenced from?
Technical manuals
Online databases
Manufacturers' catalogues
Engineering textbooks
What is a common method used to thread LCS?
Using a hand-held tools
Using a free-standing threading machine
Using a welding machine
Using a laser cutter
What must be done before using a free-standing threading machine?
Obtain a license
Complete a safety course
Receive training
Purchase safety gear
What does the chuck do in the threading process?
It melts the tube
It rotates to grip the tube
It paints the tube
It measures the tube
What does the handheld threader rotate to allow threading?
The clamp
The dies
The tube
The arm
What is the purpose of lubricating the cutting action with oil when threading?
To increase the speed of cutting
To prevent rust on the dies
To reduce friction and heat
To make the threads more visible
What should be done first if any cutting of an LSC tube is required?
Paint the tube
De-burr the tube
Heat the tube
Measure the tube
Which tool is used for cutting polybutylene pipes?
Hacksaw 32tpi
Ratchet style cutter for waste pipe
Pipe cutter for polybutylene
Medium file set to remove burrs
What is the purpose of a medium file set in tube work?
To cut pipes
To measure lengths
To remove burrs
To mark lines
What are some of the uses of plastic that plumbers use on a daily basis?
Cooking and baking
Cold water, hot water, central heating, guttering, above ground drainage, and below ground drainage
Painting and decorating
Gardening and landscaping
What is thermoplastic made from?
Metal alloy
Wood pulp
Polymer resin
Glass fiber
What happens to thermoplastic when it is frozen?
It becomes flexible
It becomes brittle
It melts
It expands
Are thermoplastics recyclable?
Yes
No
Only some types
Only when mixed with other materials
What is PVCu commonly used for?
Cold water, soil pipes, waste and overflow pipes, guttering and downpipe
Hot water, electrical wiring, insulation, roofing
Fuel lines, gas pipes, electrical conduits, flooring
Heating systems, air conditioning, refrigeration, ventilation
What does MDPE stand for?
Medium density polyethylene
Maximum density polyethylene
Minimum density polyethylene
Modified density polyethylene
Which type of polyethylene is used for underground mains and is blue in color?
MDPE
HDPE
PVCu
LDPE
What is a common characteristic of both MDPE and HDPE?
Degrades in sunlight
Suitable for hot water
Used for electrical wiring
Non-degradable
Which type of tube is suitable for waste pipes and overflow applications?
Polypropylene
Polybutylene
ABS Acrylonitrile Butadiene Styrene
PVC
What is a characteristic of Polybutylene tubes?
Solvent welded
Push fit
Degrades in direct sunlight
Feels slightly greasy to touch
Which material is known to degrade in sunlight and is solvent welded?
Polypropylene
Polybutylene
ABS Acrylonitrile Butadiene Styrene
PVC
What is a common use for Polybutylene tubes?
Waste pipes
Cold water
Commercial water
Overflow
What should be allowed for when measuring and bending tubes?
Expansion and contraction
Color and texture
Weight and density
Length and width
What should always be removed after cutting tubes?
Paint
Burrs
Labels
Dust
What is required if solvent welding is used?
Insulation
Ventilation
Painting
Shortening
What causes sunlight degradation in tubes?
Rain
UV light
Wind
Snow
What should be used for pressure pipes?
Support sleeves (inserts)
Extra paint
Shortening
Insulation
How are the X dimensions on plastic typically determined?
Automatically measured by machines
Manually measured and worked out
Estimated using software
Calculated using a formula
Where do some manufacturers now state the X dimensions?
On their websites
In their catalogues
In their instruction manuals
On product packaging
