MDE 7 End of Unit Quiz

MDE 7 End Of Unit Quiz

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Oil Pressure Cut-Out

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

B) Activates an external pump to boost oil pressure

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

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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?

D) To decrease the engine's operating temperature

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

A) To increase the lubricating oil viscosity

B) To ensure the engine continues running without alarms

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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

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

B) Activates a cooling fan to lower temperature

A) Provides additional cooling when temperatures rise

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4. Shaft Brake

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

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

C) To increase fuel efficiency during low-speed operations

A) To slow down the engine in an emergency

D) To reduce vibration in the engine room

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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

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

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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

B) Fuel filter clogging trip

A) Exhaust temperature trip

C) Oil temperature sensor

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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

D) To ensure the oil is properly filtered

A) To monitor the oil level

C) To measure the viscosity of the engine oil

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8. Gearbox Temperature Sensor

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

C) To monitor the gearbox speed

A) To control the gearbox oil level

D) To ensure smooth gear changes

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

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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?

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

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

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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

A) Increase the engine load to maximum capacity

B) Isolate the temperature sensor from the control system

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

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

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

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

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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3. Overload Clutch

Question: What is the purpose of an overload clutch in a gearbox arrangement?

A) To increase the engine’s fuel efficiency

C) To maintain a constant engine speed

D) To ensure smooth gear shifting

B) To protect the gearbox from damage due to excessive torque

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