MDE 14 End of Unit Quiz

MDE 14 End Of Unit Quiz

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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?

B) Crankcase door interlock

D) Cooling water pressure interlock

C) Exhaust valve interlock

A) Crankcase explosion relief valve interlock

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Question 2:
During which stroke of a four-stroke diesel engine cycle is the air start valve usually open?

A) Intake stroke

B) Compression stroke

C) Power stroke

D) Exhaust stroke

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Question 3: During an attempt to start a large marine diesel engine, you find that no air is being delivered to the cylinders. What could be a likely cause?

D. Low cylinder compression.

B. Exhaust valve stuck in the open position.

A. Faulty fuel pump.

C. Closed starting air supply valve.

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

B. Starting air valve condition.

D. Turbocharger speed.

A. Fuel injection timing.

C. Piston ring clearance.

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Question 2:
Which of the following is a key maintenance task for the air motor to prevent corrosion and ensure long-term reliability?

B) Cleaning the fuel injectors

A) Lubricating the air motor components regularly

D) Adjusting the valve clearances

C) Replacing the air intake filter

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Question 3:
How does the timing of the air start valve's opening relate to the inlet and exhaust valves' operation in a four-stroke diesel engine?

D) The air start valve opens when the inlet valve is closed and the exhaust valve is open

C) The air start valve opens when both the inlet and exhaust valves are open

A) The air start valve opens when both inlet and exhaust valves are closed

B) The air start valve opens when the inlet valve is open and the exhaust valve is closed

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Question 2:
What is the function of the starting air interlock in a direct air start medium-speed diesel engine?

A) To prevent the engine from starting if the cooling water temperature is too low

B) To ensure that the fuel valves are in the open position

C) To prevent starting if the main starting air valve is not fully open

D) To ensure that the crankcase doors are properly secured

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Question 3:
In an air starting system, the interlock system is designed to:

B) Maintain constant air pressure in the starting air system

D) Monitor the lube oil temperature during engine start-up

A) Ensure that the engine cannot be started unless the turning gear is disengaged

C) Regulate the amount of fuel injected during startup

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Question 3:

How is the solenoid activated in a solenoid-operated starting system?

D) By a current flowing through its coil

A) By a mechanical switch

B) By an electronic control unit (ECU)

C) By a push-button on the dashboard

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Question 1:
What is the primary purpose of regularly checking the air pressure in the air motor starting system?

D) To avoid excessive wear on the engine's crankshaft

B) To maintain the correct fuel-air mixture

C) To prevent the air motor from overheating

A) To ensure the air motor operates at the correct speed

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Question 3:
Why is it important to inspect the condition of the air motor’s drive gear during routine maintenance?

B) To ensure the gear is properly aligned with the engine's flywheel

C) To verify the air motor's air intake is clear

D) To confirm the air pressure is within the specified range

A) To check for signs of overheating

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Question 1:

What is the primary function of the solenoid in a solenoid-operated, battery-powered electric starting system?

A) To regulate the fuel flow to the engine

B) To engage the starter motor with the engine’s flywheel

C) To monitor the engine’s oil pressure

D) To cool the battery during operation

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