Water Hot Quiz 3

What type of hot water system is shown in the following diagram

• Direct system
• Point of use system
• Single-feed indirect system
• Double feed indirect system

The lever operated spherical plug valve show below uses which one of the following to isolate the water supply

• Rubber washer
• Ceramic Disk
• Rotating ball
• Gate-shaped Wedge

What is the minimum size of an open-vent pipe from a direct hot water storage system

• 28mm
• 22mm
• 10mm
• 15mm

The expanded water from an indirect open-vented hot water system should travel through which pipe to the feed and expansion cistern

• Primary open vent
• Primary cold feed
• Secondary open vent
• Secondary cold feed

What is the minimum recommended distance that the base to a feed and expansion cistern should project past the edges of the cistern itself

• 50mm
• 100mm
• 150mm
• 250mm

In comparison to a standard indirect cylinder, a super-duty indirect hot water storage cylinder features a:

• Higher water capacity
• Lower water capacity
• Faster heat recovery rate
• Lower heat recovery rate

A multi-point instantaneous water heater is most suited to providing hot water to

• An electric shower
• The outlets in a property with one bathroom
• the outlets in a property with two bathrooms
• the outlets in a property with three bathrooms

The hot water outlet from a multi-point water heater serving a small domestic property is usually sized at

• 10mm
• 15mm
• 22mm
• 28mm

In addition to a control thermostat, a new immersion heater must include which of the following

• a temperature relief valve
• an overheat thermostat
• a pressure relief valve
• a double check valve

Backflow is most likely to occur in a hot water system when

• A tap outlet discharges below spillover level of a sanitary appliance
• a tap outlet discharges above the spillover level of a sanitary appliance
• the water pressure in the hot water system is too great
• the water flow rate in the hot water system is too great