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

D) Lubricate the air motor components more frequently

A) Replace the entire air supply line

C) Increase the air pressure to blow out the moisture

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Question 3:

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

C) By a push-button on the dashboard

A) By a mechanical switch

D) By a current flowing through its coil

B) By an electronic control unit (ECU)

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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

D) The fuel pump is deactivated

C) The alternator charges the battery

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

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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

C) Power stroke

B) Compression stroke

D) Exhaust stroke

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Question 1:

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

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

B) To provide additional cooling to the engine

D) To enhance the lubrication of engine components

A) To assist with fuel injection timing

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Question 1:

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

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

D) To cool the battery during operation

A) To regulate the fuel flow to the engine

C) To monitor the engine’s oil pressure

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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?

A) Lubricating the air motor components regularly

B) Cleaning the fuel injectors

D) Adjusting the valve clearances

C) Replacing the air intake filter

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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?

C. Closed starting air supply valve.

D. Low cylinder compression.

B. Exhaust valve stuck in the open position.

A. Faulty fuel pump.

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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)

C) 270° after TDC

B) 90° after TDC

D) 360° (BDC)

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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

A) To check for signs of overheating

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

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

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

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

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

C) Ensure the fuel pumps are correctly aligned

A) Prevent starting if the oil temperature is too high

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