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WorksheetsWEEK1 PART2
Total questions: 50
Worksheet time: 25mins
What is a major advantage of copper pipes over steel pipes?
Higher resistance to acid
Lower cost of pipe fittings
Greater resistance to heat
Both A and B
What is the main reason for the smooth interior of plastic pipes?
To resist corrosion
To allow faster water flow
To prevent scale and buildup
All of the above
Which type of galvanized pipe is more resistant to acid waste?
Steel pipe
Wrought iron pipe
Lead pipe
Bituminous pipe
What is the recommended hanger distance for a 2-inch PVC pipe?
1.00 m
2.50 m
3.00 m
4.00 m
Why are vitrified clay pipes suitable for underground sewer installations?
They are lightweight
They resist acid waste
They are flexible
They are cheap
What is the main limitation of galvanized steel pipes for hot water supply?
High cost
Susceptibility to corrosion
Inflexibility
Limited availability
Which of the following is a flexible synthetic pipe type?
CPVC
ABS
PE
uPVC
What is the advantage of hub less cast iron pipes over double-hub pipes?
Easier installation
Lower cost
Better resistance to acid
Stronger joints
Why are plastic pipes not universally accepted for plumbing?
High cost
Limited durability
Certain codes still restrict their use
Difficult installation
What is the primary purpose of a cleanout fitting?
To reduce water pressure
To facilitate pipe cleaning and maintenance
To increase water flow
To connect pipes of different sizes
What is the standard commercial length of a cast iron pipe?
150 cm
100 cm
200 cm
180 cm
Which type of cast iron pipe is used to avoid caulking of joints?
Standard Pipe
Hub less Pipe
Double Hub Pipe
Single Hub Pipe
How much oakum is needed for 10 joints of a 75 mm east iron pipe?
0.8 kg
1.5 kg
2.0 kg
3.5 kg
What is the engagement length for a 100 mm cast iron pipe?
6.2 cm
6.8 cm
7.5 cm
8.0 cm
Which tool is best for cutting cast iron pipes to achieve a clean cut?
Rotary cutter
Hacksaw
Pipe wrench
Cold chisel and hammer
How many pipes are needed to cover a 6.50 m installation using 75 mm hub less pipes?
4
5
6
7
How much lead is required for 10 joints of a 50 mm cast iron pipe?
5 kg
10 kg
7.5 kg
8.0 kg
How long should Teflon tape be for 5 rounds on a 20 mm pipe joint?
0.54 m
0.83 m
1.15 m
1.50 m
Which material is most suitable for a water line requiring flexibility?
Galvanized steel
PVC
Copper (soft type)
Cast iron
How much solvent cement is needed for 20 joints of 63 mm plastic pipes?
70 grams
100 grams
120 grams
200 grams
What is the ratio of travel to offset for a 45° offset?
1.732
1.414
1.000
0.577
Which pipe is bent using a spring inside the pipe?
Cast iron
Copper pipe
Galvanized steel
Plastic pipe
What is the effective length of a 100 mm pipe with a telescopic length of 14 cm?
5.84 m
5.87 m
5.82 m
5.80 m
Which method is used to calculate galvanized steel pipe lengths?
Face-to-face method
End-to-end method
Thread-to-thread method
Compression method
How many 6-meter 160 mm plastic pipes are needed for a 28.50-meter installation?
4
5
6
7
What is the main advantage of using 45° fittings over 90° fittings?
Reduced material cost
Easier installation
Less friction loss
Greater water pressure
Which tool should NOT be used for cutting plastic pipes?
Hacksaw
Rotary cutter
Sharp knife
Handsaw
How many neoprene rubber sleeves are required for 10 hub less pipe connections?
8
9
10
11
Which soldering material is applied to clean surfaces of copper pipes before heating?
Teflon tape
Flux
Epoxy
Solvent
How much Teflon tape is needed for 12 joints of 25 mm pipes with 5 turns each?
5.65 m
6.00 m
6.78 m
7.20 m
What is the minimum slope required for horizontal drainage pipes under normal conditions, according to the NPCP?
10 mm/m
20 mm/m
15 mm/m
25 mm/m
Under what condition can a 102 mm or larger pipe be installed with a slope of 10 mm/m?
When there is excessive depth in the drainage line.
When approved by the Administrative Authority.
Both A and B.
None of the above.
What type of fitting is used to connect horizontal drainage lines to vertical stacks?
Double hub fitting
45° wye branch
Single tee branch
Saddle fitting
What fitting is prohibited for use in vertical positions?
45° wye ,branch
Combination wye and 1/8 bend
Double hub fitting for leak-caulked joints
22.5° elbow
What is the maximum spacing for supports on vertical plastic pipes?
1.2 m
1.5 m
3.0 m
1.0 m
Which pipe material requires protection when passing through corrosive material?
Galvanized steel
Plastic pipe
Copper pipe
All of the above
Which type of pipe hanger is used for vertical piping systems?
Clevis hanger
Riser clamp
J-hanger
Roller hanger
What is the primary use of a clevis hanger?
Supporting vertical pipes
Supporting horizontal pipes
Handling thermal expansion
None of the above
What is the recommended test pressure for a hydrostatic rough piping test?
75 psi
125 psi
50 psi
100 psi
What type of pipe cutter is best suited for cutting soil pipes?
Hacksaw
Ratchet cutter
Hinged pipe cutter
Soil pipe cutter
Which tool is used for creating a watertight flare on flexible copper tubing?
Ratchet cutter
Flaring tool
Spiral reamer
Pipe die
What is the maximum interval for supporting horizontal cast iron soil pipes?
1.5 m
2.0 m
3.0 m
1.2 m
What is the purpose of spring hangers in piping systems?
To support thermal expansion and contraction
To reduce corrosion
To provide rigid pipe support
To increase pipe insulation
Which type of drain cleaner attachment is used for breaking up hardened chemical deposits?
Hook auger
Spade cutter
Funnel auger
Drop head auger
Which pipe threading tool is adjustable for cutting external threads?
Pipe die
Pipe tap
Pipe reamer
Flaring tool
Which testing method uses air pressure for leak detection?
Hydrostatic test
Compressed air test
Water test
Smoke test
Which type of auger is used for removing dense root stoppages?
Hook auger
Retrieving auger
Spiral saw tooth cutter
Grease cutter
How much pressure should be applied for a finish piping test?
125 psi
100 psi
75 psi
50 ps1
Which type of wrench is used for gripping metal pipes?
Adjustable wrench
Pipe wrench
Socket wrench
Torque wrench
What is the purpose of a roller hanger in piping systems?
To fix pipes in place
To allow thermal expansion and contraction
To support vertical pipes
To distribute weight evenly
