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Worksheets6035 | Scientific Principles | LO2
Total questions: 14
Worksheet time: 8mins
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
The only true way of fully removing hard water is the use of:
Base exchange unit
Galvanic cell scale
Chemical inhibitor
Magnetic scale
From the following, which options have a long life and do not need regular maintenance?
Water softener
Chemical inhibitor
Magnetic scale inhibitor
Electrical scale inhibitor
Galvanic cell scale inhibitor
The galvanic cell scale inhibitor is made from a combination of copper and ______ to form an electron flow.
Iron
Magnesium
Aluminium
Zinc
Although the the soft water affects the life of pipework due to the acidic nature, what benefit does it have over hard water?
Less ferrous oxide within the system (rust).
No presence of limescale within the system.
The water heats up quicker.
Less maintenance required.
