Pumps — Engineering, Mashit 30
11 questions on pumps, from the Engineering exam of Mashit 30. Centrifugal, piston, Jabsco-type and bilge pumps. Every question is shown with its correct answer, as in the official question pool.
Practise by topic · All 178 Engineering questions · Mock exam
Questions on Pumps
- What is the basic purpose of a centrifugal pump on an engine? Pumping water.
- What can a piston pump do? It can pump air and liquids.
- What is the working principle of a piston pump? Changing volume.
- Which positions must the operating switch of an automatic bilge pump have? Off, manual, automatic (float switch).
- What is the most common fault in a raw-water pump? A blocked suction inlet.
- What is the working principle of a centrifugal pump? The rotation throws the liquid outwards, against the walls of the pump casing.
- What is a portable submersible pump commonly used for? Pumping bilge water in an emergency.
- On what principle does a rubber-impeller pump (Jabsco) work? Changing volume.
- Why might a centrifugal bilge pump be unable to discharge the water overboard? The hydrostatic pressure at the discharge is too high.
- The suction is free of blockages, but the centrifugal pump cannot pump. What is the cause? Air is getting into the suction line.
- What will happen if you run a Jabsco pump with the valve on its suction side closed? The impeller will burn and be damaged.
More Engineering topics
- Engine principles — 17 questions
- Engine parts — 16 questions
- Fuel system — 27 questions
- Lubrication and oil — 21 questions
- Cooling system — 18 questions
- Electrical system — 23 questions
- Propulsion and propeller — 15 questions
- Operating routine — 9 questions
- Fault-finding — 11 questions
- Safety and fire — 3 questions
- Calculations and units — 7 questions
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