MDE 14 End of Unit Quiz

MDE 14 End Of Unit Quiz

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Question 1:

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

A) To assist with fuel injection timing

D) To enhance the lubrication of engine components

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

B) To provide additional cooling to the engine

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Question 3:

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

A) By a mechanical switch

C) By a push-button on the dashboard

D) By a current flowing through its coil

B) By an electronic control unit (ECU)

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

A) To check for signs of overheating

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

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

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

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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

D) To cool the battery during operation

C) To monitor the engine’s oil pressure

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Question 7:

What is the purpose of the starter relay in an electric starting system?

D) To monitor the engine temperature

C) To amplify the current to the starter motor

A) To engage the solenoid

B) To supply power to the ignition system

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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

C) Ensure the fuel pumps are correctly aligned

A) Prevent starting if the oil temperature is too high

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

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Question 4:

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

B) It regulates the fuel supply to the engine

A) It stores excess hydraulic fluid for future use

C) It maintains hydraulic pressure for starting the engine

D) It filters impurities from the hydraulic oil

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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

B) Starter motor

D) Voltage regulator

C) Battery

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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.

D. Check the lube oil level in the sump.

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

C. Check the condition of the fuel injectors.

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

B) Compression stroke

A) Intake stroke

D) Exhaust stroke

C) Power stroke

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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

A) Crankcase explosion relief valve interlock

C) Exhaust valve interlock

D) Cooling water pressure interlock

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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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