Hot Water Systems Quiz L3P2U5,1.7

What is the main cause of expansion and contraction in hot water systems?

• The temperature of the cold water supply

• The type of pipe material used

• The size of the hot water tank

• The rate of flow of hot water

What is the coefficient of thermal linear expansion for plastic pipe?

• 0.00003m/m/oC

• 0.00018m/m/oC

• 0.000016m/m/oC

• 0.00023m/m/oC

Which type of pipe material expands more than copper or steel?

• Cross-linked polyethylene

• Polybutylene

• Steel

• Copper

What is the coefficient of thermal linear expansion for copper pipe?

• 0.00018m/m/oC

• 0.00003m/m/oC

• 0.000016m/m/oC

• 0.00023m/m/oC

What is the potential negative effect of expansion and contraction in pipework passing through wooden joists and timber studs?

• Leakage

• Reduced water pressure

• Ticking or creaking noises

• Corrosion

What is the linear expansion of a 20m run of plastic pipe with a temperature variation of 65oC?

• 0.23m

• 0.03m

• 0.003m

• 2.3m

What can expanding and contracting pipework create?

• Improved insulation

• Unwanted ticking and creaking noises

• Increased water flow

• Higher water pressure

What is the linear expansion of a 35m run of copper pipe with a temperature variation of 50oC?

• 0.3m

• 0.03m

• 3m

• 0.003m

What is the effect of temperature variation on the expansion of copper pipe?

• Decreased expansion

• No expansion

• Significant expansion

• Slight expansion

What is the potential negative effect of expansion and contraction in hot water systems?

• Increased energy efficiency

• Leakage and pipe damage

• Improved water quality

• Reduced maintenance requirements