SANITATION MOCK TEST A

Which British Standard lays down the installation requirements for gravity rainwater systems?

• BS 5449.

• BS 6700.

• BS EN 12056.

• BS EN 12588.

Answer explanation

BS EN 12056 specifies the installation requirements for gravity rainwater systems, making it the correct choice among the options provided.

A below ground drainage system designed to receive both foul and surface water is said to be a

• combined system

• separate system

• partially separate system

• unvented system.

Answer explanation

A combined system is designed to handle both foul and surface water in a single drainage system, making it the correct choice for the question.

Which one of the following may be used to lubricate the rubber ‘O’ ring of a ring seal joint on plastic sanitary pipework?

• Flux.

• Silicone spray.

• Jointing compound.

• Gap filling cement.

Answer explanation

Silicone spray is suitable for lubricating rubber 'O' rings as it provides a safe, effective lubrication without damaging the rubber. Other options like flux, jointing compound, and gap filling cement are not appropriate for this purpose.

What is the minimum recommended depth of trap seal for a basin with pipework connecting to a discharge stack?

• 19 mm.

• 38 mm.

• 50 mm.

• 75 mm.

Answer explanation

The minimum recommended depth of trap seal for a basin connected to a discharge stack is 75 mm. This depth helps prevent sewer gases from entering the building and ensures proper drainage.

What is the purpose of the rainwater fitting shown in figure 1? To

• make an angled connection between two rainwater pipes

• discharge rainwater into a gulley

• connect a length of rainwater pipe to a drain pipe

• connect the gutter to the rainwater pipe.

Answer explanation

The purpose of the rainwater fitting is to discharge rainwater into a gulley, allowing for proper drainage and preventing water accumulation, which is essential for effective rainwater management.

If a 12 m length of plastic gutter is laid to a fall of 1 in 600, what is the vertical drop between the gutter start and finish points?

• 10 mm.

• 20 mm.

• 30 mm.

• 50 mm.

Answer explanation

To find the vertical drop, use the formula: drop = length / fall ratio. Here, drop = 12 m / 600 = 0.02 m, which is 20 mm. Thus, the vertical drop between the gutter start and finish points is 20 mm.

A stack vent must rise to a height of 900 mm above an opening into a building when it terminates within what distance of that opening?

• 1000 mm.

• 2000 mm.

• 2500 mm.

• 3000 mm.

Answer explanation

A stack vent must rise 900 mm above an opening if it terminates within 3000 mm of that opening. This ensures proper ventilation and prevents backflow of gases, making 3000 mm the correct distance.

What is the name of the gutter bracket shown in figure 2?

• Fascia bracket.

• Rafter bracket.

• Spacer bracket.

• Drive-in bracket.

Answer explanation

The correct answer is 'Drive-in bracket' because this type of bracket is designed to be driven directly into the fascia board, providing a secure attachment for the gutter system, as shown in figure 2.

The sanitary pipework system component shown in figure 3 is used for making a connection between which one of the following?

• A plastic soil pipe and a cast iron socket.

• A plastic soil pipe and a plastic socket.

• A plastic soil pipe and a copper drain socket.

• Two plastic soil pipe ends forming a socket.

Answer explanation

The component connects a plastic soil pipe to a cast iron socket, allowing for compatibility between different materials in plumbing systems, which is essential for proper drainage and waste management.

What is the minimum size of stack vent (dry portion of a soil stack) for a 2 storey property?

• 50 mm.

• 75 mm.

• 100 mm.

• 150 mm.

Answer explanation

The minimum size of a stack vent for a 2 storey property is 75 mm. This size ensures adequate ventilation for the drainage system, preventing issues like siphoning and maintaining proper air pressure.