MDE 11 Q7

1 / 8

Which factor primarily influences the discharge frequency of an engine lubricating oil purifier?

B) The level of contaminants in the oil

A) The engine's operating speed

D) The type of oil being used

C) The ambient temperature around the purifier

2 / 8

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

B) A faulty fuel injector

D) Excessive oil temperature

A) Overuse of the engine’s air filter

C) A leaking cylinder head gasket

3 / 8

What is a common cause of oil losses in a centrifugal separator?

B) Excessive oil viscosity

C) Incomplete separation of contaminants

A) Overheating of the separator

D) Incorrect oil type used

4 / 8

Question 2:

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

B) To assess the oil's viscosity

A) To determine the oil's flashpoint

D) To measure the oil's acid number

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

5 / 8

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

C) Regularly cleaning and maintaining the separator

D) Using a different type of oil

A) Reducing the separator’s rotational speed

B) Increasing the oil temperature

6 / 8

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?

A) Visual inspection of the oil’s color

B) Laboratory analysis of oil samples

D) Smelling the oil for any burnt odors

C) Onboard testing for water content and acid number

7 / 8

Question 2:

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

D) A heating element

A) A stationary disc stack

C) A series of fixed blades

B) A rotating bowl or rotor

8 / 8

Why might oil losses occur due to operational temperature issues in a separator?

B) Because high temperatures can cause oil degradation and carryover

C) Because low temperatures increase oil viscosity too much

D) Because operational temperatures do not affect the separator’s performance

A) Because oil becomes too dense and clogs the separator

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