MDE 14 End of Unit Quiz

MDE 14 End Of Unit Quiz

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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.

D. Check the lube oil level in the sump.

C. Check the condition of the fuel injectors.

A. Check the air start valve timing.

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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?

C) Replacing the air intake filter

B) Cleaning the fuel injectors

D) Adjusting the valve clearances

A) Lubricating the air motor components regularly

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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

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

D) The fuel pump is deactivated

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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

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

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

A) To check for signs of overheating

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Question 1:
Which of the following is a safety device commonly fitted to the air starting system of a large medium-speed marine diesel engine?

D) Governor actuator

C) Fuel oil purifier

B) Exhaust gas temperature sensor

A) Pressure relief valve

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Question 1:

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

C) To monitor the engine’s oil pressure

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

A) To regulate the fuel flow to the engine

D) To cool the battery during operation

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Question 6:

Which component prevents the starter motor from operating when the engine is already running?

D) Starter inhibitor switch

A) Starter relay

B) Ignition switch

C) Neutral safety switch

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Question 4:

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

A) It stores excess hydraulic fluid for future use

B) It regulates the fuel supply to the engine

D) It filters impurities from the hydraulic oil

C) It maintains hydraulic pressure for starting the engine

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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?

A) It ensures that the exhaust valve opens immediately

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

D) It guarantees maximum compression during the power stroke

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

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Question 6:

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

C) To monitor the temperature of the hydraulic oil

D) To provide additional cooling to the hydraulic system

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

B) Air distributor

D) Crankcase relief valve

A) Safety valve

C) Starting air valve

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

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

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

A) Prevent starting if the oil temperature is too high

C) Ensure the fuel pumps are correctly aligned

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