MDE 16 End of Unit Quiz

MDE 16 End Of Unit Quiz

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Question:
Which of the following is an effective remedy for the burning of lubricating oil in marine diesel engines?

C. Reduce engine load

B. Increase the fuel injection pressure

D. Clean the air filters

A. Replace worn piston rings

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Question 4: A possible cause of high bearing temperatures due to operational issues could be:

C) Overloading the engine beyond its design capacity

B) Frequent engine shutdowns

A) Running the engine at lower than recommended speeds

D) Reduced fuel injection pressure

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Question 5:

If a diesel engine is overheating due to excessive engine load, what should be done to remedy the situation?

A) Reduce engine load

B) Increase the fuel supply

D) Clean the fuel injectors

C) Adjust the air intake

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

D) Low turbocharger speed

A) Insufficient fuel supply

B) Build-up of deposits on the turbine wheel

C) Overheating of the turbocharger housing

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Question 5:

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

A. Loose or worn-out fan belt

C. Clogged air filter

B. Worn-out valve guides

D. Low coolant level

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Question 2:

Which of the following could cause a cylinder air start valve to leak?

A) Incorrect valve timing

C) Low engine oil pressure

B) Build-up of carbon deposits on the valve

D) Excessive turbocharger speed

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Question:
Which of the following is an effective remedy for excessive fuel injection in marine diesel engines?

D. Reduce the fuel pump delivery rate

A. Adjust the fuel injection timing

B. Increase the engine speed

C. Replace the fuel injectors

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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?

D) It raises oil temperature; improve cooling

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

B) It increases oil viscosity; change the oil

C) It contaminates the oil; replace the oil filter

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Question 4:
How can you minimize abnormal turbocharger vibration caused by shaft misalignment?

C) By increasing the exhaust back pressure

B) By regularly checking and adjusting the shaft alignment

D) By reducing the turbocharger's rotational speed

A) By using a thicker grade of lubricating oil

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Question 4: What should be done if the air start valve continues to leak after cleaning and inspection?

A) Apply lubricant to the valve to reduce leakage

C) Install a temporary bypass to maintain engine operation

D) Reduce the engine load and continue running

B) Replace the air start valve with a new one

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Question 3:

Which of the following could cause a whining noise in a diesel engine during operation?

B. Air in the fuel system

C. Damaged turbocharger

D. Faulty oil pump

A. Worn-out bearings

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Question 4:

A diesel engine is producing a thumping noise during operation. Which of the following is a probable cause?

B. Loose timing chain

D. Excessive carbon build-up in the combustion chamber

A. Broken engine mounts

C. Misaligned crankshaft

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