MDE 11 Q7

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Question 1:

Which of the following practices is essential to maintain the lubricating oil in optimum condition in a large medium-speed diesel engine?

B) Periodically cleaning the oil using a centrifugal separator

C) Allowing the oil to settle in the sump for long periods

D) Increasing the engine's operating temperature

A) Regularly changing the oil with fresh oil

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Question 3:

In a centrifugal type lubricating oil filter, how are the contaminants typically collected and separated from the oil?

C) They are dissolved in the oil and carried away

A) They are trapped in a mesh screen

B) They are collected on the inner wall of the rotating bowl

D) They are filtered through a paper element

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Why is it important to use the correct type of oil for a specific separator?

C) To reduce the oil’s flash point

D) To make the oil more prone to contamination

B) To match the oil viscosity with the separator’s operational requirements

A) To ensure the oil does not degrade the separator material

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Question 3:

How is the condition of lubricating oil in a large medium-speed diesel engine typically monitored?

A) By visually inspecting the oil color

B) By regularly testing the oil's viscosity, water content, and acid number

D) By observing the oil pressure gauge readings

C) By smelling the oil for unusual odors

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Question 2:

What is the main component in a centrifugal lubricating oil filter that creates the necessary centrifugal force?

C) A series of fixed blades

D) A heating element

A) A stationary disc stack

B) A rotating bowl or rotor

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Which operational issue can result in oil carryover in a centrifugal separator?

B) Inadequate maintenance of the separator

A) High oil pressure

C) Low oil temperature

D) Correctly adjusted separator settings

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Which of the following is a common cause of water contamination in diesel engine lubricating oil?

A) Overuse of the engine’s air filter

D) Excessive oil temperature

C) A leaking cylinder head gasket

B) A faulty fuel injector

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

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.

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.

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