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?

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

A) Allows the engine to run regardless of oil pressure

B) Activates an external pump to boost oil pressure

D) Increases engine speed to manage oil pressure

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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

D) To maintain engine RPM during high-load conditions

C) To enable faster engine startup

A) To reduce fuel consumption during idle periods

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Question 3: What does a high coolant temperature trip do in a diesel engine?

A) It increases fuel supply to compensate for temperature changes

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

D) It activates an external cooling fan

C) It adjusts the engine speed to manage temperature

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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

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

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

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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?

B) To monitor the engine temperature

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

D) To measure the engine’s oil pressure

A) To regulate the engine fuel supply

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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

A) By disconnecting the shutdown system and running the 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

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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?

B) The trip mechanism automatically resets once the speed decreases

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

A) The trip mechanism remains engaged until manually reset

D) The mechanism continues to trip intermittently

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3. Overload Clutch

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

C) To maintain a constant engine speed

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

D) To ensure smooth gear shifting

A) To increase the engine’s fuel efficiency

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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

D) Calibrating the turbocharger pressure

A) Checking the engine coolant level

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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

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

A) To increase the lubricating oil viscosity

D) To decrease the engine's operating temperature

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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

A) Activates a warning alarm when speed limits are exceeded

C) Increases engine speed to manage high RPMs

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