MDE 14 End of Unit Quiz

MDE 14 End Of Unit Quiz

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Question 5:
During a routine check, what should be done if moisture is found in the air motor's air supply line?

B) Drain the moisture and inspect the air dryer or moisture separator

C) Increase the air pressure to blow out the moisture

D) Lubricate the air motor components more frequently

A) Replace the entire air supply line

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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?

B. Inspect the turbocharger for blockages.

D. Check the engine cooling water temperature.

C. Verify the correct positioning of the camshaft.

A. Check for leaks in the starting air system.

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Question 2:

Which component of the electric starting system provides the electrical power needed to turn the starter motor?

A) Alternator

D) Voltage regulator

B) Starter motor

C) Battery

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Question 3:

Which interlock is commonly found in a diesel engine hydraulic oil start system to ensure safe operation?

D) Fuel pressure regulator

C) Coolant temperature gauge

A) Engine oil pressure switch

B) Hydraulic fluid level sensor

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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.

A. Air start valve stuck in the open position.

C. Low engine coolant level.

B. Incorrect fuel injection timing.

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Question 2:
What is the primary function of the non-return valve in the air starting system of a medium-speed marine diesel engine?

C) To measure exhaust gas temperature

D) To control the flow of cooling water

A) To prevent backflow of air into the receiver

B) To regulate the fuel injection timing

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

B) To maintain the correct fuel-air mixture

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

C) To prevent the air motor from overheating

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

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Question 5:

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

C) The alternator charges the battery

A) The battery is disconnected from the starter motor

D) The fuel pump is deactivated

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

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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 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?

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.

D. Check the lube oil level in the sump.

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Question 4:

What role does the hydraulic accumulator play in the hydraulic oil start system of a diesel engine?

D) It filters impurities from the hydraulic oil

A) It stores excess hydraulic fluid for future use

C) It maintains hydraulic pressure for starting the engine

B) It regulates the fuel supply to the engine

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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?

C) Lube oil pressure interlock

D) Fuel injection interlock

A) Over-speed trip interlock

B) Turning gear engagement interlock

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