MDE 14 End of Unit Quiz

MDE 14 End Of Unit Quiz

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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?

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

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

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

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Question 5:

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

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

C) The alternator charges the battery

A) The battery is disconnected from the starter motor

D) The fuel pump is deactivated

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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

D) To ensure that the crankcase doors are properly secured

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

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

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Question 1:

What is the primary function of the hydraulic oil start system in a diesel engine?

D) To enhance the lubrication of engine components

A) To assist with fuel injection timing

B) To provide additional cooling to the engine

C) To initiate the engine’s start-up by engaging the starting mechanism

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

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

A) To check for signs of overheating

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

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

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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

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

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

C) To prevent the air motor from overheating

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Question 2:

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

D) Voltage regulator

C) Battery

B) Starter motor

A) Alternator

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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?

C) 270° after TDC

B) 90° after TDC

A) 0° (TDC)

D) 360° (BDC)

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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

C) Replacing the air intake filter

A) Lubricating the air motor components regularly

D) Adjusting the valve clearances

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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?

A. Check the air start valve timing.

C. Check the condition of the fuel injectors.

D. Check the lube oil level in the sump.

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

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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?

D) To control the flow of cooling water

B) To regulate the fuel injection timing

A) To prevent backflow of air into the receiver

C) To measure exhaust gas temperature

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Question 4:
What is a common sign that the air motor’s exhaust port needs to be inspected or cleaned?

A) Reduced engine starting speed

B) Increased air pressure in the system

D) Oil leaks around the air motor housing

C) Unusual noise from the air motor

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