MDE 14 End of Unit Quiz

MDE 14 End Of Unit Quiz

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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

C) To prevent the air motor from overheating

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

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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 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:

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

C) It maintains hydraulic pressure for starting the engine

B) It regulates the fuel supply to the engine

A) It stores excess hydraulic fluid for future use

D) It filters impurities from the hydraulic oil

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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?

C) The air start valve opens when both the inlet and exhaust valves are open

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

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Question 4:

Which of the following describes the role of the starter motor in the electric starting system?

A) To generate electrical power for the ignition system

C) To crank the engine and initiate combustion

D) To regulate the engine’s fuel injection

B) To provide cooling to the engine

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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

D) Exhaust stroke

C) Power stroke

B) Compression stroke

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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?

C. Low engine coolant level.

B. Incorrect fuel injection timing.

A. Air start valve stuck in the open position.

D. Excessive crankcase pressure.

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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?

C) Fuel oil purifier

A) Pressure relief valve

B) Exhaust gas temperature sensor

D) Governor actuator

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Question 5:

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

D) The fuel pump is deactivated

A) The battery is disconnected from the starter motor

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

C) The alternator charges the battery

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Question 5:

Which safety interlock prevents the hydraulic oil start system from operating if certain conditions are not met?

B) Battery voltage sensor

A) Hydraulic pressure switch

D) Starting motor relay

C) Engine temperature sensor

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

D) Oil leaks around the air motor housing

B) Increased air pressure in the system

C) Unusual noise from the air motor

A) Reduced engine starting speed

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