MDE 11 Q7

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Question 2:

What is the main purpose of using a centrifugal separator in a large medium-speed diesel engine's lubricating oil system?

D) To add additives to the oil

B) To remove water and particulate contaminants from the oil

A) To cool the lubricating oil

C) To increase the oil's viscosity

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How can water in engine oil impact engine performance?

C) It decreases the engine’s noise level

A) It enhances fuel efficiency

B) It can lead to engine knocking and reduced performance

D) It improves engine power output

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How can seal and joint failures contribute to oil losses in a separator?

B) By allowing oil to escape through leaks

D) By altering the oil's chemical composition

A) By increasing the oil temperature

C) By reducing the separator’s rotational speed

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Question 2:

What is the purpose of conducting a blotter spot test on lubricating oil on board?

B) To assess the oil's viscosity

D) To measure the oil's acid number

A) To determine the oil's flashpoint

C) To detect the presence of contaminants such as soot and water

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Which component failure is likely to introduce water into the engine lubricating oil?

C) A damaged water pump

B) A cracked oil pan

A) A malfunctioning turbocharger

D) A failing oil pump

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Question: Which of the following best explains the principle of operation of a magnetic lubricating oil filter?

B) The filter employs a magnetic field to attract and remove ferrous particles from the oil.

D) The filter heats the oil to evaporate water and other contaminants.

A) The filter uses centrifugal force to separate contaminants from the oil.

C) The filter utilizes a series of mesh screens to trap and remove particles from the oil.

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How can temperature control contribute to minimizing oil losses in a separator?

A) By maintaining the oil within an optimal temperature range to prevent degradation

B) By increasing the operational temperature to improve separation

C) By cooling the oil to reduce its viscosity significantly

D) By making the oil more acidic to enhance separation

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Question 2: How does a coalescer filter separate water from distillate fuel oil?

C) By using a series of filter media that cause small water droplets to merge into larger droplets, which are then easily separated.

D) By heating the fuel to evaporate the water content.

A) By using a magnetic field to attract water particles.

B) By passing the fuel through a hydrophobic membrane that repels water.

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