MDE 16 End of Unit Quiz

MDE 16 End Of Unit Quiz

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Question:
How can combustion defects in a diesel engine be diagnosed?

A. By checking the oil pressure

C. By measuring the coolant temperature

D. By testing the battery voltage

B. By inspecting the color of exhaust smoke

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Question 1:
What is the primary function of a fluid coupling in a marine propulsion system?

brake

A) To provide a direct mechanical connection between the engine and the propeller

C) To reduce fuel consumption by controlling engine speed

B) To allow for smooth transmission of power by using fluid dynamics

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Question 3:
Which safety precaution should be taken when dealing with hot air start pipework?

A. Allow the pipework to cool before handling

B. Use insulated gloves to handle the pipework

D. Temporarily shut down the engine and allow the system to cool

C. Increase the air start pressure to speed up cooling

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

B) Engine oil

D) Diesel fuel

C) Hydraulic oil

A) Water

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Question 6:

What could be a mechanical cause of unstable engine speed, and how can it be fixed?

B) Faulty thermostat; replace the thermostat

A) Worn camshaft; replace the camshaft

D) Loose electrical connections; tighten connections

C) Low fuel pressure; adjust the fuel pressure regulator

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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

B) Repair or replace the radiator fan

A) Increase engine RPM

D) Replace the fuel pump

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Question 5:

Before leaving port, why is it important to conduct a test run of the main propulsion engine?

D. To avoid using the auxiliary engine for longer periods

A. To burn off excess lubricating oil

C. To increase the engine's operating temperature to the maximum

B. To ensure that all systems are operating correctly and respond as expected

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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?

B) Overheating of cooling water

C) Excessive oil pressure

A) Low oil viscosity

D) Low lubricating oil temperature

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Question 4:

How can issues with the fuel supply system lead to unstable engine speed, and what is the appropriate remedy?

C) Faulty starter motor; replace starter

D) Broken engine mounts; repair mounts

B) Low engine oil pressure; add oil

A) Fuel contamination; replace the fuel filter

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Question 1:

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

A. Incorrect fuel injection timing

C. Low oil pressure

B. Worn-out cylinder liner

D. Faulty air intake system

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Question:
The air start pipework on a diesel engine attached to the cylinder head is becoming extremely hot. What is the most probable cause?

A. Insufficient air supply pressure to the air start system

D. Blockage or restriction in the air start pipework

B. Air leak in the pipework allowing hot gases to escape

C. Excessive exhaust gas temperature due to incorrect fuel mixture

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Question: How can a leaking cylinder air start valve be detected while the engine is running?

A) By observing a drop in lubricating oil pressure

D) By monitoring for a hissing sound near the air start valve manifold

B) By listening for unusual knocking noises in the engine

C) By checking for exhaust gas temperature fluctuations

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