Unit 309 Session 2b (Magnetite in systems

What is one major consequence of black sludge accumulation in a central heating system?

• Improved heating efficiency

• Reduced heating costs

• Damage to system components

• Enhanced water flow

What substance primarily builds up in steel radiators due to corrosion?

• Water

• Black iron oxide sludge

• Rust

• Calcium deposits

How quickly can parts of a central heating system fail due to corrosion if left unchecked?

• Within a year

• Within weeks

• Within days

• Within months

What percentage of heat output can be lost due to cold areas forming in radiators?

• 10%

• 25%

• 36%

• 50%

What does the presence of black sludge indicate about a boiler?

• It is functioning optimally

• It is more likely to break down

• It is energy efficient

• It requires no maintenance

What can happen to your heating bills if black sludge builds up in your heating system?

• They may decrease

• They may remain unchanged

• They may increase

• They will be eliminated

What is one potential effect of leaving corrosion unchecked in a central heating system?

• Increased air circulation

• Cold areas in radiators

• Higher water quality

• Better fuel efficiency

In a central heating system, where is corrosion most likely to occur?

• In the boiler only

• In the piping only

• In steel radiators

• In the thermostat