9189 - Phase 2 - Unit 309 - Sanitation Systems

1. The diagram below shows which type of drainage system?

• A combined system
• A partially combined system
• A separate system
• A partially separate system

2. What is the maximum distance allowed from the highest waste connection to the invert of the drain on a stub stack system before ventilation is required?

• 1.6m
• 1.8m
• 2m
• 2.5m

3. A waste pipe discharging into a ground level gully should do which of the following?

• Discharge over the grate
• Discharge through the grate but above the water level of the trap seal
• Discharge adjacent to the grate
• Discharge through the grate and below the water level of the trap sea

4. If a 4m length of soil pipe had a fall of 18mm per metre, what would the vertical drop be at the end of the pipe run?

• 180mm
• 110mm
• 418mm
• 72mm

5. The image below shows a fixing which would be used in the installation of which of the following appliances?

• A wall hung WC
• A washbasin fixed to a wall without a pedestal
• A combined towel hook and cup holder
• A shower unit with hose loop

6. The Water Regulations state that which of the following are the maximum flushes for a WC?

• 4 litres short flush and 6 litres long flush
• 10 litres long flush and 6 litres short flush
• 9 litres long flush and 6 litres short flush
• 3 litres short flush and 5 litres long flush

7. An ascending spray bidet can be described by which of the following sentences?

• A spray entering the appliance, from a tap, from above the rim of the bidet
• A spray entering the bidet from the side of the appliance
• A spray entering the area of the bidet from a high level
• A spray entering the bidet from the base of the appliance

8. The diagram below shows a cross-section of a type of WC pan. Select the correct description from the answers below.

• Wash down with double trap
• Siphonic with an overflow
• Wash down with single trap
• Siphonic with a double trap

9. Which of the following should be the minimum diameter of a kitchen sink waste discharge pipe?

• 32mm
• 40mm
• 50mm
• 65mm

10. A self-sealing valve is designed to operate in which way when under back pressure?

• Remain tightly closed
• Always remain open
• Occasionally open
• Remain in the mid-position