PLUMBING 2025 REVISED MOCK EXAM QUESTIONS WITH
100% CORRECT ANSWERS
Air gap and minimum size - Unobstructed vertical distance through air between the lowest point of a
water supply outlet and the flood level rim of the fixture it discharges to.
25mm and 2x diameter of the opening of the water supply outlet in height.
Air Break and minimum size - Vertical unobstructed space between the lowest point of an indirectly
connected waste soul or waste pipe and the flood level rim to where the fixture discharges
Equal to fixture drain, no less than 25mm
Branch vent - A vent pipe that is connected at its lower end to the junction of 2 or more vent pipes
and at its upper end, either to a branch vent or stack vent, vent stack or vent header or terminated
to open air.
Additional circuit vent - A vent pipe that is installed between a circuit vent and relief vent to provide
more air circulation.
Carcinogen - A cancer-causing substance
Pathogen - a bacterium, virus, or other microorganism that can cause disease.
Back siphonage - Backflow caused by a negative pressure in the supply system
Backwater valve - Check valve designed for use in a drainage system
Bathroom group and hydraulic load - A group of plumbing fixtures consisting of a domestic lavatory ,
water closet and a bathtub or one one-head shower.
W/ TT; 6FU
W/FV; 8FU
100% CORRECT ANSWERS
Air gap and minimum size - Unobstructed vertical distance through air between the lowest point of a
water supply outlet and the flood level rim of the fixture it discharges to.
25mm and 2x diameter of the opening of the water supply outlet in height.
Air Break and minimum size - Vertical unobstructed space between the lowest point of an indirectly
connected waste soul or waste pipe and the flood level rim to where the fixture discharges
Equal to fixture drain, no less than 25mm
Branch vent - A vent pipe that is connected at its lower end to the junction of 2 or more vent pipes
and at its upper end, either to a branch vent or stack vent, vent stack or vent header or terminated
to open air.
Additional circuit vent - A vent pipe that is installed between a circuit vent and relief vent to provide
more air circulation.
Carcinogen - A cancer-causing substance
Pathogen - a bacterium, virus, or other microorganism that can cause disease.
Back siphonage - Backflow caused by a negative pressure in the supply system
Backwater valve - Check valve designed for use in a drainage system
Bathroom group and hydraulic load - A group of plumbing fixtures consisting of a domestic lavatory ,
water closet and a bathtub or one one-head shower.
W/ TT; 6FU
W/FV; 8FU
