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

C) To monitor the bearing's rotational speed

D) To adjust the propeller pitch automatically

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8. Gearbox Temperature Sensor

Question: What is the role of a gearbox temperature sensor in a propulsion engine arrangement?

D) To ensure smooth gear changes

B) To detect excessive heat that could damage the gearbox components

C) To monitor the gearbox speed

A) To control the gearbox oil level

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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?

B) The trip mechanism automatically resets once the speed decreases

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

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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?

D) Completely drain the lubricating oil from the engine

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

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

A) It uses a hydraulic piston to regulate engine speed

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

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

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

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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?

B) Isolate the temperature sensor from the control system

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

D) Bypass the high-temperature sensor

A) Increase the engine load to maximum capacity

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

A) Exhaust temperature trip

D) Engine vibration sensor

C) Oil temperature sensor

B) Fuel filter clogging trip

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Oil Pressure Cut-Out

Question 2: How does an oil pressure cut-out function in a diesel engine?

C) Monitors oil pressure and stops the engine when pressure is too low

D) Increases engine speed to manage oil pressure

A) Allows the engine to run regardless of oil pressure

B) Activates an external pump to boost oil pressure

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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

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

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

A) To monitor the oil level

D) To ensure the oil is properly filtered

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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

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

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

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

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7. Emergency Stop Button

Question: Why is an emergency stop button fitted to a propulsion engine control system?

B) To quickly shut down the engine in case of an emergency

A) To reduce fuel consumption during idle periods

C) To enable faster engine startup

D) To maintain engine RPM during high-load conditions

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