MDE 16 End of Unit Quiz

MDE 16 End Of Unit Quiz

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Question 5:

If low lubricating oil pressure is caused by excessive oil viscosity, what is the recommended action?

B) Change the oil to a lower viscosity grade

C) Adjust the oil pressure relief valve

A) Replace the oil pump

D) Clean the oil passages

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Question 2: What could be a reason for high bearing temperatures in a diesel engine due to issues with the lubricating oil?

C) Excessive oil pressure

A) Low oil viscosity

D) Low lubricating oil temperature

B) Overheating of cooling water

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Question 4:

Which condition may lead to a cylinder air start valve leak?

D) High ambient temperature

B) Corrosion or pitting of the valve components

A) Insufficient fuel supply

C) Improper alignment of the crankshaft

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Question 5:

What might be the cause of a high-pitched squealing noise in a diesel engine?

C. Clogged air filter

D. Low coolant level

A. Loose or worn-out fan belt

B. Worn-out valve guides

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Question 4:
What might cause abnormal turbocharger vibration at a steady speed in a diesel engine?

C) Perfect alignment of the turbocharger housing

D) Correct fuel-air mixture

B) Worn bearings in the turbocharger

A) Excessive air filter cleanliness

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Question 7:

How can a leaking oil line or gasket contribute to low lubricating oil pressure, and what is the appropriate solution?

B) It increases oil viscosity; change the oil

C) It contaminates the oil; replace the oil filter

A) It allows oil to escape; repair or replace the damaged line or gasket

D) It raises oil temperature; improve cooling

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Question 7:

If an engine is overheating due to a failing radiator fan, what should be the corrective action?

C) Adjust the ignition timing

A) Increase engine RPM

B) Repair or replace the radiator fan

D) Replace the fuel pump

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Question 2:
Which fluid is most commonly used in a fluid coupling for marine propulsion?

C) Hydraulic oil

B) Engine oil

D) Diesel fuel

A) Water

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Which of the following are possible causes for blue smoke in marine diesel engines? (Select TWO)

A. Overheating of the engine

D. Worn piston rings

C. Excessive fuel injection

B. Burning of lubricating oil

E. Insufficient air supply

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Question 5:

Which of the following scenarios could lead to a false high oil level reading in the main engine sump?

C. Improperly seated dipstick

D. Engine running at full speed

B. Overfilled oil sump

A. Cold engine oil

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Question 4:

How can a malfunctioning water pump lead to overheating, and what is the recommended solution?

B) It can restrict coolant flow; replace the water pump

C) It can increase oil temperature; replace the oil filter

A) It can cause coolant to leak; replace the water pump

D) It can cause excessive exhaust temperature; adjust the timing

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Question 3:
Abnormal turbocharger vibration while operating at a steady speed could be caused by:

A) Insufficient fuel supply

C) Overheating of the turbocharger housing

D) Low turbocharger speed

B) Build-up of deposits on the turbine wheel

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