6035 | Scientific Principles | LO2

Due to the expansion of water when between the temperatures of 4° and 99°C, how does the system cope? (select 2)

• The pressure relief valve releases the increase in pressure

• The expansion vessel takes up the 4% increase when heated on sealed systems

• The open vented systems allow the expansion through the vent pipe

• The automatic bypass valve allows the pressure to be exerted round the system when shut off

Statement: The boiling point of water at sea level is 100°C, but due to atmospheric pressure being lower the higher up you are, the boiling point on the peak of Mount Everest is only 69°C.

• True

• False

When a liquid can be drawn sideways or upwards between two close-fitting surfaces against gravity, it is known as?

• Latent heat

• Plumbosolvency

• Capillary action

• Atmospheric pressure

273K (Kelvin) is equivalent to:

• 273°C

• 0°F

• 0°C

• 100 kPa

If a system was to be filled at 100L of water, between the temperatures of 4° and 99° there would be how much water present in the system?

• 100L

• 104L

• 110L

• 96L

Temporary hard water, if heated to 65°C and above will cause:

• The formation of limescale

• The formation of pitting

• The formation of ferrous oxide

• The formation of electrolytes

Plumbosolvency is:

• Waters aggressiveness towards copper

• Waters ability to activate electrolytic corrosion

• Waters ability to cause iron to rust

• Waters ability to dissolve lead

Which of the following not only protects the inside of the pipework, but the outer layer too?

• Red oxide paint

• Chemical inhibitor

• Zinc galvanisation

• Denso tape

Cuprosolvency is:

• Waters aggressiveness towards copper

• Waters ability to activate electrolytic corrosion

• Waters ability to cause iron to rust

• Waters ability to dissolve lead

The heat required to raise the water temperature to 100°C is (1)_________ heat.

The heat required to keep it boiling is (2)_______ heat.

• (1) sensible heat

• (1) latent heat

• (2) sensible heat

• (2) latent heat