MDE 16 End of Unit Quiz

MDE 16 End Of Unit Quiz

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

E. Insufficient air supply

A. Overheating of the engine

D. Worn piston rings

C. Excessive fuel injection

B. Burning of lubricating oil

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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?

A) Low oil viscosity

D) Low lubricating oil temperature

C) Excessive oil pressure

B) Overheating of cooling water

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Question 2: If high bearing temperature persists after reducing engine load, what should be the next step?

A) Continue monitoring until the temperature normalizes

B) Check the lubricating oil flow and pressure

C) Add water to the cooling system

D) Increase the engine speed to circulate more oil

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Question 1: What is the first action that should be taken if a high bearing temperature is detected in a diesel engine during operation?

A) Increase engine speed to reduce load

C) Reduce engine speed and load to minimize heat generation

D) Add more lubricating oil to the bearing

B) Immediately stop the engine

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Question 1: What is the first step to take upon discovering a leaking cylinder air start valve while the engine is running?

B) Increase the engine speed to reduce air leakage

C) Shut down the engine and isolate the affected cylinder

A) Continue normal operation until the next scheduled maintenance

D) Manually operate the valve to clear the leak

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Question 3:

What is a potential cause of unstable engine speed related to the engine's electronic control system?

D) Low battery voltage

B) Faulty engine control unit (ECU)

A) Worn timing belt

C) Leaking cylinder head gasket

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Question 5:

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

C) Adjust the oil pressure relief valve

D) Clean the oil passages

B) Change the oil to a lower viscosity grade

A) Replace the oil pump

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Question 4:

Which of the following is an important check to perform on the main propulsion system's gearbox before departure?

B. Ensuring that the gearbox is in neutral

C. Checking for unusual noises during operation

D. All of the above

A. Verifying that the gearbox oil level is correct

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Question 5: Which of the following could cause high bearing temperatures due to maintenance-related issues?

B) Use of recommended bearing materials

D) Properly sized bearing housing

C) Insufficient clearance between the bearing and shaft

A) Regular lubrication maintenance

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Question 1:

Which of the following is a possible cause of knocking noise in a diesel engine during operation?

D. Faulty air intake system

B. Worn-out cylinder liner

C. Low oil pressure

A. Incorrect fuel injection timing

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Question 3:

How can a blocked oil filter lead to low lubricating oil pressure, and what is the appropriate remedy?

A) It restricts oil flow; replace the oil filter

D) It increases oil temperature; cool the oil

B) It causes oil to leak; tighten the oil filter

C) It dilutes the oil; change the oil

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Question 2:

If a diesel engine is overheating due to a malfunctioning thermostat, what is the appropriate remedy?

A) Clean the fuel system

C) Increase engine load

D) Adjust the timing

B) Replace the thermostat

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