MDE 7 End of Unit Quiz

MDE 7 End Of Unit Quiz

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Question 4: What is the purpose of a low fuel level cut-out in a diesel engine?

A) To prevent fuel contamination

C) To stop the engine if the fuel level falls below a certain point

B) To automatically refuel the engine

D) To adjust the fuel injection timing

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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

D) To reduce vibration in the engine room

A) To slow down the engine in an emergency

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

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High Coolant Temperature Trip

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

A) Provides additional cooling when temperatures rise

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

D) Allows the engine to continue operating at higher temperatures

B) Activates a cooling fan to lower temperature

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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

A) To increase the lubricating oil viscosity

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

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

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

A) It increases fuel supply to compensate for temperature changes

C) It adjusts the engine speed to manage temperature

D) It activates an external cooling fan

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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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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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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?

C) Verify the calibration of the pressure calibrator and retest

A) Increase the pressure further until the engine stalls

B) Immediately replace the pressure sensor and restart the test

D) Manually shut down the engine and report the fault

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Low Fuel Level Cut-Out

Question 4: How does a low fuel level cut-out function in a diesel engine?

C) Allows the engine to continue operating until the fuel level is critically low

A) Automatically refuels the engine when the fuel level is low

D) Activates an alarm to notify the operator of low fuel levels

B) Stops the engine when the fuel level drops below a certain threshold

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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

D) To adjust the propeller pitch automatically

A) To maintain the engine’s RPM

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Question 3: What component of the centrifugal overspeed trip mechanism is responsible for detecting excessive engine speed?

D) The crankshaft position sensor

B) The centrifugal governor

A) The temperature sensor

C) The fuel injection pump

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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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