MDE 7 End of Unit Quiz

MDE 7 End Of Unit Quiz

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Question 2: How does a centrifugal overspeed trip mechanism operate?

B) It employs a spring-loaded valve to control fuel flow

D) It uses an electronic sensor to monitor engine speed and trigger an alarm

A) It uses a hydraulic piston to regulate engine speed

C) It relies on centrifugal force to actuate a trip mechanism that stops the engine when a certain speed is exceeded

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Question 2: Which safety cut-out is designed to prevent engine operation in the event of low oil pressure?

A) Oil pressure cut-out

B) High-temperature trip

D) High exhaust temperature trip

C) Low coolant level sensor

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1. Low Oil Pressure Alarm

Question: What is the primary reason for fitting a low oil pressure alarm to a propulsion engine?

D) To maintain proper engine speed

A) To alert the crew of excessive fuel consumption

B) To ensure the engine does not overheat

C) To warn of inadequate lubrication that could lead to engine damage

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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?

A) The trip mechanism remains engaged until manually reset

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

D) The mechanism continues to trip intermittently

B) The trip mechanism automatically resets once the speed decreases

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

B) Inspecting the condition of the centrifugal weights and springs

C) Replacing the engine oil filter

A) Checking the engine coolant level

D) Calibrating the turbocharger pressure

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6. Vibration Sensor

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

A) To reduce noise levels in the engine room

D) To regulate the engine temperature

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

C) To ensure the engine operates at the correct speed

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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

D) To adjust the fuel injection timing

B) To automatically refuel the engine

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Overspeed Trip

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

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

D) Deactivates the fuel pump to reduce speed

C) Increases engine speed to manage high RPMs

A) Activates a warning alarm when speed limits are exceeded

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Manual Testing of HT Cooling Water High-Temperature Shutdown

Question 2: How is the high-temperature shutdown set point manually tested on a diesel generator?

D) By simulating a high-temperature condition using an external device

B) By gradually heating the HT cooling water until the shutdown occurs

A) By disconnecting the shutdown system and running the generator

C) By lowering the HT cooling water temperature to below the set point

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Manual Testing of Lubricating Oil Low-Pressure Alarm

Question 1: What is the first step in manually testing the set point for the low-pressure alarm on a diesel engine’s lubricating oil system using a pressure calibrator?

C) Gradually decrease the applied pressure using the pressure calibrator while monitoring the alarm system

D) Completely drain the lubricating oil from the engine

A) Increase the engine speed to maximum RPM

B) Disconnect the lubricating oil pressure sensor from the control system

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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

A) To increase the lubricating oil viscosity

B) To ensure the engine continues running without alarms

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5. Oil Mist Detector

Question: What is the reason for fitting an oil mist detector in a propulsion engine’s crankcase?

B) To detect the presence of oil mist that could indicate a crankcase explosion risk

C) To measure the viscosity of the engine oil

D) To ensure the oil is properly filtered

A) To monitor the oil level

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