MDE 14 End of Unit Quiz

MDE 14 End Of Unit Quiz

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Question 4:
The low lube oil pressure interlock in a direct air start medium-speed diesel engine is designed to:

A) Prevent starting if the oil temperature is too high

B) Prevent starting if lube oil pressure is below a safe threshold

C) Ensure the fuel pumps are correctly aligned

D) Ensure that the governor is set to the correct speed

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Question 1: When initiating the start sequence on a large medium-speed marine diesel engine with individual air starting valves, the engine fails to start. Which of the following is the first check you should perform?

D. Check the lube oil level in the sump.

B. Check if the main starting air receiver is pressurized.

A. Check the air start valve timing.

C. Check the condition of the fuel injectors.

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Question 2: If an engine does not start when initiating the start sequence, and the air start lever is in the correct position, what should be the next step?

C. Verify the correct positioning of the camshaft.

A. Check for leaks in the starting air system.

D. Check the engine cooling water temperature.

B. Inspect the turbocharger for blockages.

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Question 3:
Which interlock prevents a medium-speed diesel engine from being started if the engine's crankcase doors are open?

C) Exhaust valve interlock

D) Cooling water pressure interlock

A) Crankcase explosion relief valve interlock

B) Crankcase door interlock

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Question 4:
What is the significance of the crank angle at which the air start valve closes on a four-stroke diesel engine?

C) It allows the inlet valve to open at the right moment

A) It ensures that the exhaust valve opens immediately

B) It prevents the backflow of exhaust gases into the starting air system

D) It guarantees maximum compression during the power stroke

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Question 6:

In a hydraulic oil start system, what is the purpose of the hydraulic control valve?

D) To provide additional cooling to the hydraulic system

C) To monitor the temperature of the hydraulic oil

B) To filter impurities from the hydraulic fluid

A) To regulate the flow of hydraulic fluid to the starting motor

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Question 5:

What happens when the starter switch is turned on in a solenoid-operated starting system?

A) The battery is disconnected from the starter motor

C) The alternator charges the battery

D) The fuel pump is deactivated

B) The solenoid engages the starter motor and the engine cranks

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Question 1:
At what approximate crank angle does the air start valve typically begin to open on a four-stroke diesel engine during the starting process?

A) 0° (TDC)

B) 90° after TDC

D) 360° (BDC)

C) 270° after TDC

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Question 5: Which of the following could cause a failure to start in a large marine diesel engine due to an issue with the air starting system?

D. Excessive crankcase pressure.

C. Low engine coolant level.

B. Incorrect fuel injection timing.

A. Air start valve stuck in the open position.

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Question 4:
Which safety device in the air starting system is responsible for releasing excess air to the atmosphere in case of an overpressure condition?

A) Safety valve

D) Crankcase relief valve

C) Starting air valve

B) Air distributor

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Question 4: What should be inspected if there is air leakage during the start sequence of a marine diesel engine?

D. Turbocharger speed.

C. Piston ring clearance.

B. Starting air valve condition.

A. Fuel injection timing.

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Question 1:
Which of the following interlocks is most commonly fitted to a direct air start medium-speed diesel engine to prevent the engine from starting if the turning gear is engaged?

A) Over-speed trip interlock

C) Lube oil pressure interlock

B) Turning gear engagement interlock

D) Fuel injection interlock

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