Hot Water PowerPoint 4

What is the effect of increasing the head height in a gravity-fed hot water system?

• It decreases the pressure.

• It increases the pressure.

• It decreases the flow rate.

• It has no effect.

What happens when a hot tap is opened in a gravity-fed hot water system?

• Cold water is pushed up into the hot water cylinder.

• Hot water is pushed down into the cold water storage.

• Cold water is pushed down into the hot water cylinder.

• Hot water is pushed up into the cold water storage.

How does the diameter of the pipe affect the flow rate in a gravity-fed hot water system?

• A larger diameter decreases the flow rate.

• A larger diameter increases the flow rate.

• A larger diameter has no effect on the flow rate.

• A larger diameter decreases the pressure.

What is the purpose of positioning the cold feed above the cold distribution in a CWSC system?

• To ensure the system refills with water if the valve fails.

• To allow hot water to flow continuously.

• To prevent the system from overheating.

• To increase water pressure in the system.

Why should all pipes be laid with a slight fall in a CWSC system?

• To increase water pressure.

• To prevent airlocks within the system.

• To reduce water temperature.

• To enhance water flow speed.

What type of valve must be installed just prior to the float operated valve on a rising main to the CWSC?

• Ball valve

• Service valve

• Check valve

• Pressure relief valve

Why must a fullway gate valve be used on the cold feed pipe?

• It is a high pressure system

• It is a low pressure system

• It is a medium pressure system

• It is a variable pressure system

What is the minimum length required for the initial part of the hot distribution pipe leading to the vent pipe connection?

• 300mm

• 450mm

• 600mm

• 750mm

What is parasitic circulation?

• Circulation that occurs within the same pipe

• Circulation that occurs between two separate pipes

• Circulation that occurs only in horizontal pipes

• Circulation that occurs in closed systems only

What is the minimum size requirement for the open vent pipe?

• 15mm

• 18mm

• 22mm

• 25mm