MDE 7 End of Unit Quiz

MDE 7 End Of Unit Quiz

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9. Propeller Shaft Bearing Temperature Sensor

Question: Why is a temperature sensor fitted to the propeller shaft bearing?

A) To maintain the engine’s RPM

B) To detect overheating in the bearing that could lead to failure

D) To adjust the propeller pitch automatically

C) To monitor the bearing's rotational speed

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

B) High-temperature trip

C) Low coolant level sensor

D) High exhaust temperature trip

A) Oil pressure cut-out

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Overspeed Trip of the Centrifugal Type

Question 1: What is the primary purpose of an overspeed trip of the centrifugal type in a diesel engine?

A) To regulate the engine fuel supply

B) To monitor the engine temperature

D) To measure the engine’s oil pressure

C) To prevent engine damage by stopping the engine if it exceeds a predetermined speed

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High Coolant Temperature Trip

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

D) Allows the engine to continue operating at higher temperatures

A) Provides additional cooling when temperatures rise

B) Activates a cooling fan to lower temperature

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

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Question 5: Which safety cut-out is specifically designed to detect and prevent excessive exhaust gas temperatures?

D) Engine vibration sensor

C) Oil temperature sensor

A) Exhaust temperature trip

B) Fuel filter clogging trip

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Restoring Normal Operation After Testing

Question 4: After manually testing the lubricating oil low-pressure alarm and shutdown using a pressure calibrator, what should be the next step?

A) Permanently increase the engine's lubricating oil pressure

D) Increase the engine load to full capacity and monitor the system

C) Drain the lubricating oil and replace it with new oil

B) Reconnect the pressure sensor and reset the alarm and shutdown systems to their normal settings

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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

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

A) It increases fuel supply to compensate for temperature changes

D) It activates an external cooling fan

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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 Shutdown

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

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

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

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

A) By disconnecting the shutdown system and running the generator

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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?

C) To measure the viscosity of the engine oil

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

D) To ensure the oil is properly filtered

A) To monitor the oil level

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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?

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

D) Completely drain the lubricating oil from the engine

A) Increase the engine speed to maximum RPM

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

B) To ensure the engine continues running without alarms

A) To increase the lubricating oil viscosity

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

D) To decrease the engine's operating temperature

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