Prelim Quiz 1: Auxiliary Machinery

What is the primary principle behind the operation of a purifier/separator on a ship?

• Gravitational settling

• Centrifugal force

• Magnetic separation

• Thermal expansion

In a purifier, where do the heavier contaminants like water and solids accumulate?

• At the center of the bowl

• Near the discharge valves

• At the periphery of the bowl

• In the motor assembly

What is the main function of the disc stack in some purifiers?

• To generate rotational force

• To increase the surface area for separation

• To store clean fuel before discharge

• To regulate the motor speed

How does a clarifier differ from a purifier?

• A clarifier removes only solid particles, while a purifier separates solids, water, and fuel

• A clarifier operates at lower speeds than a purifier

• A clarifier does not use centrifugal force, while a purifier does

• A clarifier is used for water separation, while a purifier is used for fuel separation

Why is oil purification important for ship operations?

• It improves the ship's speed by reducing fuel weight

• It prevents contamination of fresh water supplies

• It ensures clean fuel supply, improving engine efficiency and reducing maintenance

• It helps in reducing the ship’s overall electrical consumption

Which of the following is an example of a solid contaminant in oil?

• Fuel dilution

• Emulsified water

• Metal wear particles

• Entrained air

What is the effect of emulsified water in lubricating oil?

• It enhances the oil’s cooling properties

• It improves the lubrication efficiency

• It reduces the oil’s lubricating properties

• It increases oil viscosity for better performance

How can fuel enter the lubricating oil and become a contaminant?

• Through excessive air intake

• Through leaks in the fuel system or incomplete combustion

• Through exposure to high temperatures

• Through oxidation reactions

What type of oil contamination can lead to corrosion of engine components?

• Entrained air

• Microorganisms

• Acids from oil breakdown or combustion byproducts

• High oil viscosity

Which of the following is a common method to prevent oil contamination?

• Reducing oil viscosity for better flow

• Regular oil analysis and proper filtration

• Increasing the engine’s operating temperature

• Mixing different types of lubricants for better performance