MDE 7 End of Unit Quiz

MDE 7 End Of Unit Quiz

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Question 4: What is the purpose of a low fuel level cut-out in a diesel engine?

A) To prevent fuel contamination

C) To stop the engine if the fuel level falls below a certain point

B) To automatically refuel the engine

D) To adjust the fuel injection timing

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Final System Check After Testing

Question 5: What is the purpose of performing a final system check after testing the lubricating oil low-pressure alarm and shutdown?

C) To confirm that the pressure alarm and shutdown system are functioning correctly after being reset

D) To decrease the engine's operating temperature

B) To ensure the engine continues running without alarms

A) To increase the lubricating oil viscosity

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Question 4: What happens to the centrifugal overspeed trip mechanism if the engine speed returns to normal after an overspeed condition?

C) The trip mechanism requires a complete engine shutdown for reset

A) The trip mechanism remains engaged until manually reset

B) The trip mechanism automatically resets once the speed decreases

D) The mechanism continues to trip intermittently

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2. High-Temperature Alarm

Question: Why is a high-temperature alarm fitted to the cooling system of a propulsion engine?

A) To prevent the engine from running too cold

D) To monitor the fuel temperature

B) To alert the crew of excessive engine temperature that could cause overheating and damage

C) To ensure the gearbox remains properly lubricated

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Question 5: Which of the following is a common maintenance check for the centrifugal overspeed trip mechanism?

D) Calibrating the turbocharger pressure

B) Inspecting the condition of the centrifugal weights and springs

C) Replacing the engine oil filter

A) Checking the engine coolant level

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Question 3: What component of the centrifugal overspeed trip mechanism is responsible for detecting excessive engine speed?

C) The fuel injection pump

D) The crankshaft position sensor

B) The centrifugal governor

A) The temperature sensor

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High Coolant Temperature Trip

Question 3: How does a high coolant temperature trip function in a diesel engine?

B) Activates a cooling fan to lower temperature

A) Provides additional cooling when temperatures rise

D) Allows the engine to continue operating at higher temperatures

C) Senses coolant temperature and halts engine operation when overheating occurs

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Overspeed Trip

Question 1: How does an overspeed trip function in a diesel engine?

A) Activates a warning alarm when speed limits are exceeded

C) Increases engine speed to manage high RPMs

B) Uses centrifugal force to activate the cut-out when speed exceeds the limit

D) Deactivates the fuel pump to reduce speed

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4. Shaft Brake

Question: Why might a shaft brake be fitted to a propulsion engine?

D) To reduce vibration in the engine room

C) To increase fuel efficiency during low-speed operations

A) To slow down the engine in an emergency

B) To prevent the propeller from rotating when the engine is stopped

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6. Vibration Sensor

Question: What is the purpose of a vibration sensor on a propulsion engine?

C) To ensure the engine operates at the correct speed

B) To monitor and detect abnormal vibrations that could indicate mechanical failure

A) To reduce noise levels in the engine room

D) To regulate the engine temperature

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Manual Testing of HT Cooling Water High-Temperature Alarm

Question 1: What is the first step in manually testing the set point for the high-temperature alarm on a diesel generator’s HT cooling water system?

D) Bypass the high-temperature sensor

C) Gradually heat the HT cooling water while monitoring the temperature

A) Increase the engine load to maximum capacity

B) Isolate the temperature sensor from the control system

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Question 3: What does a high coolant temperature trip do in a diesel engine?

C) It adjusts the engine speed to manage temperature

D) It activates an external cooling fan

A) It increases fuel supply to compensate for temperature changes

B) It shuts down the engine if the coolant temperature exceeds a set threshold

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