MDE 11 End of Unit Quiz

MDE 11 End Of Unit Quiz

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What maintenance practice can help prevent water contamination in the engine lubricating oil?

C) Using higher-viscosity oil

A) Regularly changing the air filter

D) Cleaning the fuel injectors

B) Ensuring proper engine warm-up before operation

2 / 12

How does the capacity of the oil purifier affect its discharge frequency?

D) A larger capacity purifier will not require any discharges

C) The capacity of the purifier does not affect discharge frequency

A) A larger capacity purifier will have a lower discharge frequency

B) A larger capacity purifier will have a higher discharge frequency

3 / 12

Question: Which of the following best explains the principle of operation of a plate edge (e.g., Auto-Klean) lubricating oil filter?

D) The filter uses a chemical reaction to neutralize acids in the oil.

B) The filter uses a series of closely spaced metal plates to trap and remove solid particles from the oil as it passes through.

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

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

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

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

D) The filter employs a chemical reaction to neutralize acids in the oil.

B) The filter uses gravity to separate contaminants from the oil.

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

5 / 12

What is one effective method to minimize oil losses due to incomplete separation in a centrifugal separator?

D) Using a different type of oil

B) Increasing the oil temperature

C) Regularly cleaning and maintaining the separator

A) Reducing the separator’s rotational speed

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Which of the following factors influence the efficiency of a centrifugal separator in a diesel engine's lubrication system?

B) The type of oil used, the color of the oil, the engine's RPM, and the size of the fuel injectors

C) The age of the oil, the type of fuel used, ambient air temperature, and the size of the engine

A) Rotor speed, oil temperature, viscosity of the oil, and the amount of contaminants present

D) The amount of water in the oil, the presence of fuel additives, the engine's cooling system, and the oil's pH level

7 / 12

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

B) A faulty fuel injector

C) A leaking cylinder head gasket

8 / 12

Which operational practice can help reduce oil carryover in a centrifugal separator?

B) Regularly monitoring and adjusting the separator’s speed

C) Using a higher viscosity oil

A) Operating the separator at a high temperature

D) Reducing the frequency of separator maintenance

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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

C) To increase the oil's viscosity

B) To remove water and particulate contaminants from the oil

A) To cool the lubricating oil

10 / 12

Question 1:

Which of the following methods is commonly used on board to assess the condition of lubricating oil in a large medium-speed diesel engine?

B) Laboratory analysis of oil samples

C) Onboard testing for water content and acid number

A) Visual inspection of the oil’s color

D) Smelling the oil for any burnt odors

11 / 12

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

12 / 12

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

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

D) To make the oil more prone to contamination

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

C) To reduce the oil’s flash point

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