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WorksheetsCHAPTER 3(NPCP)
Total questions: 10
Worksheet time: 5mins
What is a common reason for prohibiting side-inlet quarter bends in drainage systems?
A) They are too expensive to manufacture
B) They do not provide enough slope for proper drainage
C) They can cause waste backups and clogging
D) They are only allowed in residential buildings
What is the primary reason for reaming the burred ends of pipes?
A) To increase water pressure
B) To prevent turbulence and clogging
C) To reduce the cost of installation
D) To strengthen the pipe material
n an interior lot, when a rear building cannot have its own sewer line, under what condition can it connect to the front building's drain?
A) Only if the front building’s drain size is adequate for both buildings
B) If the rear building is taller than the front building
C) Only if a pump system is used
D) If the rear building has a direct connection to the city sewer
Why are running thread fittings prohibited in drainage systems?
A) They create weak joints prone to leakage
B) They are too expensive to install
C) They allow excessive water pressure
D) They require specialized tools to install
Which is an approved method for sealing an unused opening in a drainage system?
A) Covering it with tape
B) Using a rubber stopper
C) Permanently plugging or capping it
D) Leaving it open for ventilation
Which of the following drainage fittings is prohibited?
A) 45-degree elbow
B) Double hub fitting in a vertical position
C) Sanitary tee used in a vertical stack
D) Neoprene gasket with stainless steel band
What is the required slope for pipes with a diameter less than 102mm?
A) 5mm/m or 0.5%
B) 10mm/m or 1%
C) 20mm/m or 2%
D) 25mm/m or 2.5%
When using a driven pipe method for installation, how much larger should the drive pipe be compared to the pipe to be laid?
A) The same size
B) One pipe size larger
C) Two pipe sizes larger
D) Three pipe sizes larger
What is the maximum allowable length of a tunnel used for underground pipe installation?
A) 1.2 meters
B) 2.4 meters
C) 3.0 meters
D) 5.0 meters
What is the minimum required clear height above a pipe when installing it in a tunnel?
A) 0.30 meters
B) 0.45 meters
C) 0.60 meters
D) 1.00 meter
