MDE 16 End of Unit Quiz

MDE 16 End Of Unit Quiz

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

D) Diesel fuel

B) Engine oil

C) Hydraulic oil

A) Water

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Question 3:

What action should be taken if low coolant levels are causing engine overheating?

D) Clean the air filter

C) Flush the coolant

A) Replace the radiator cap

B) Add coolant to the system

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Question 1:
What is a potential cause of abnormal turbocharger vibration at a steady speed in a diesel engine?

B) Loose or damaged turbine blades

D) Blocked air intake filter

A) Inadequate fuel injection timing

C) Excessive lubricating oil pressure

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Question 4:
What is the most effective way to reduce the risk of abnormal turbocharger vibration caused by misalignment during assembly?

A. Using high-quality fuel filters

C. Increasing the clearance in the turbocharger housing

B. Ensuring precision alignment during turbocharger installation

D. Frequently changing the turbocharger oil

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Question 1:

Which of the following is a common cause of a leaking cylinder air start valve?

A) Insufficient engine lubrication

C) Overheating of the cylinder head

B) Worn or damaged valve seating

D) Excessive fuel injection pressure

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Question 5:
To reduce the likelihood of abnormal turbocharger vibration, which of the following should be done during routine maintenance?

C) Increase the lubricating oil viscosity

D) Block off the air intake partially

B) Inspect for and promptly replace damaged or loose turbine blades

A) Operate the engine at lower than recommended speeds

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

B. Increase the engine speed

A. Adjust the fuel injection timing

C. Replace the fuel injectors

D. Reduce the fuel pump delivery rate

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Question:
Which of the following is an effective remedy for insufficient air supply in marine diesel engines?

A. Clean or replace the air filters

B. Increase the fuel injection pressure

D. Adjust the fuel injection timing

C. Reduce the engine load

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Question 2:
What immediate action should be taken if the air start pipework is becoming extremely hot?

C. Check for and clear any obstructions in the pipework

A. Increase the air pressure to the air start system

B. Cool the pipework with water or air

D. Reduce the engine speed to lower the temperature

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Question 5:

If unstable engine speed is caused by a problem with the turbocharger, what should be checked?

D) Air intake temperature sensor

C) Exhaust manifold gasket

A) Turbocharger oil supply

B) Engine coolant level

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Question 3:

What could be a potential cause of a leaking cylinder air start valve?

D) Low fuel viscosity

B) Debris lodged in the valve seat

C) Over-torquing of the cylinder head bolts

A) High cooling water temperature

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Question 1:
Which of the following is a method to minimize the risk of abnormal turbocharger vibration due to unbalanced rotors?

C. Using a larger air filter

B. Regularly balancing the turbocharger rotor assembly

D. Decreasing the engine load

A. Increasing the fuel injection pressure

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