Why do we need to study about pumps?

Pumps are an integral _______ equipment common to all ships.

• auxiliary

• primary

• decorative

• navigation

Overview: Pumps are used in engine room, main engine, generator engine systems, liquid cargo operations, ballasting operations, etc. Which of the following is NOT a use of pumps on ships?

• Engine room

• Main engine

• Cooking food

• Ballasting operations

In case of emergencies like flooding and fires, pumps are also essential.

• True

• False

The purpose of Marine pumps and the types of other pumps used on board ships can be described as:

• Marine pumps are used for transferring fluids and include types such as centrifugal, reciprocating, and gear pumps.

• Marine pumps are only used for air circulation and include only vacuum pumps.

• Marine pumps are used exclusively for fuel transfer and include only screw pumps.

• Marine pumps are not essential equipment and are rarely found on ships.

Which of the following best describes the construction, operation, and application of rotary displacement pumps, including gear pumps, screw pumps, and rotary vane pumps?

• They use rotating elements to displace fluid and are commonly used for pumping viscous liquids.

• They rely on centrifugal force to move fluids and are best for high-flow, low-pressure applications.

• They use reciprocating motion to move fluids and are ideal for high-pressure, low-flow situations.

• They operate using diaphragm movement and are mainly used for metering small quantities of fluid.

The purpose and function of components of a centrifugal pump are to:

• Convert mechanical energy into hydraulic energy and move fluids efficiently.

• Store electrical energy for later use.

• Measure the temperature of fluids passing through the pump.

• Filter impurities from the fluid before it enters the pump.

The characteristic of a centrifugal pump with respect to suction lift, priming, discharge pressure, and vapour in liquid is:

• It requires priming, has limited suction lift, moderate discharge pressure, and cannot handle vapour in liquid.

• It does not require priming, has unlimited suction lift, high discharge pressure, and can handle vapour in liquid.

• It requires priming, has unlimited suction lift, low discharge pressure, and can handle vapour in liquid.

• It does not require priming, has limited suction lift, high discharge pressure, and cannot handle vapour in liquid.

Maintenance checks on submersible pumps, mono pumps, variable delivery pumps, and swash plate pumps involve:

• Inspecting for leaks, checking electrical connections, monitoring vibration, and ensuring proper lubrication.

• Only checking the pump casing for cracks.

• Running the pumps continuously without inspection.

• Ignoring electrical connections and focusing only on fluid levels.

Troubleshooting displacement and centrifugal pumps involves which of the following steps?

• Checking for leaks, inspecting seals, and monitoring pressure levels

• Ignoring unusual noises and vibrations

• Running the pump at maximum speed regardless of issues

• Replacing the pump without any inspection

The purpose and requirement of the bilge pumping system, emergency bilge suction, emergency fire pump, and ballast pumping system is to:

• Ensure removal of unwanted water, provide emergency dewatering and firefighting, and manage vessel stability.

• Increase the speed of the vessel and improve fuel efficiency.

• Monitor engine performance and control navigation systems.

• Supply fresh water to crew quarters and galley areas.