MDE 13 Q4

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Question:

With reference to main engine cooling water systems, what is the primary purpose of the header tank?

C) To filter and remove debris from the cooling water

D) To regulate the temperature of the seawater entering the cooling system

A) To cool the engine by circulating coolant through the heat exchanger

B) To provide a reservoir for excess coolant and maintain system pressure

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Question:

With reference to main engine cooling water systems, why might both heaters and coolers be fitted?

A) To adjust the coolant temperature to match the engine's operational requirements and prevent freezing or overheating

B) To increase the rate of coolant circulation and improve overall engine efficiency

C) To allow for simultaneous heating and cooling of different sections of the engine

D) To enable the engine to operate at a constant temperature regardless of external conditions

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Question:

With reference to main engine cooling water systems, what type of pumps are typically used, and why?

B) Gear pumps - They are used for their high-pressure capability but are less common in cooling systems due to their tendency to handle smaller volumes.

C) Diaphragm pumps - They are selected for their ability to handle viscous fluids but are not ideal for cooling water systems due to their limited flow capacity.

D) Peristaltic pumps - They are used for their precision in metering fluids but are not suitable for large-scale cooling systems due to their low flow rates.

A) Centrifugal pumps - They are preferred for their ability to handle large volumes of water and maintain a steady flow rate with minimal pulsation.

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