Practice question

A pressurised radiator cap is used in the cooling system mainly because:

  1. It lowers the boiling point of the coolant
  2. Raising system pressure raises the boiling point of the coolant, allowing higher operating temperatures without boiling
  3. It increases the freezing point of the coolant
  4. It stops the water pump from cavitating only

Answer: B — Raising system pressure raises the boiling point of the coolant, allowing higher operating temperatures without boiling

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