MDE 7 End of Unit Quiz

MDE 7 End Of Unit Quiz

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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?

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

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

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

A) By disconnecting the shutdown system and running the generator

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Manual Testing of Lubricating Oil Low-Pressure Shutdown

Question 2: During the manual testing of the lubricating oil low-pressure shutdown set point, what should you do if the shutdown does not activate at the expected pressure?

B) Immediately replace the pressure sensor and restart the test

C) Verify the calibration of the pressure calibrator and retest

A) Increase the pressure further until the engine stalls

D) Manually shut down the engine and report the fault

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4. Shaft Brake

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

C) To increase fuel efficiency during low-speed operations

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

A) To slow down the engine in an emergency

D) To reduce vibration in the engine room

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2. High-Temperature Alarm

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

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

C) To ensure the gearbox remains properly lubricated

D) To monitor the fuel temperature

A) To prevent the engine from running too cold

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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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5. Oil Mist Detector

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

D) To ensure the oil is properly filtered

A) To monitor the oil level

C) To measure the viscosity of the engine oil

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

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8. Gearbox Temperature Sensor

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

A) To control the gearbox oil level

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

D) To ensure smooth gear changes

C) To monitor the gearbox speed

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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

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

A) It uses a hydraulic piston to regulate engine speed

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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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Restoring Normal Operation After Testing

Question 4: What is the final step after manually testing the HT cooling water high-temperature alarm and shutdown on a diesel generator?

D) Shut down the generator and perform a full inspection

C) Reset the alarm and shutdown systems and return the HT cooling system to normal operation

A) Increase the load to ensure the generator is functioning properly

B) Replace the cooling water with fresh water

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7. Emergency Stop Button

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

A) To reduce fuel consumption during idle periods

D) To maintain engine RPM during high-load conditions

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

C) To enable faster engine startup

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9. Propeller Shaft Bearing Temperature Sensor

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

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

C) To monitor the bearing's rotational speed

A) To maintain the engine’s RPM

D) To adjust the propeller pitch automatically

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