MDE 7 End of Unit Quiz

MDE 7 End Of Unit Quiz

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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

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

A) To monitor the oil level

C) To measure the viscosity of the engine oil

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

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

A) It uses a hydraulic piston to regulate engine speed

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

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

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Verifying Set Points on Lubricating Oil Low-Pressure Alarm and Shutdown

Question 3: How should the set points be verified after manually testing the lubricating oil low-pressure alarm and shutdown?

A) Run the engine without lubricating oil and observe the results

C) Increase the lubricating oil pressure to the maximum allowed value

B) Compare the alarm and shutdown activation pressures with the specified set points

D) Adjust the engine speed to match the set points

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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?

A) To increase the lubricating oil viscosity

B) To ensure the engine continues running without alarms

D) To decrease the engine's operating temperature

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

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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?

C) To warn of inadequate lubrication that could lead to engine damage

B) To ensure the engine does not overheat

A) To alert the crew of excessive fuel consumption

D) To maintain proper engine speed

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

C) It adjusts the engine speed to manage temperature

D) It activates an external cooling fan

A) It increases fuel supply to compensate for temperature changes

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

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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?

C) Gradually decrease the applied pressure using the pressure calibrator while monitoring the alarm system

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

A) Increase the engine speed to maximum RPM

D) Completely drain the lubricating oil from the engine

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Verifying Set Points on HT Cooling Water Alarm and Shutdown

Question 3: After manually testing the high-temperature alarm and shutdown set points, what should be done to verify the accuracy of these set points?

D) Reset the alarm and shutdown system to factory settings

B) Record the temperatures at which the alarm and shutdown occurred and compare them with the set points

C) Replace the temperature sensor with a new one

A) Run the generator at full load for an extended period

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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?

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

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

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

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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

C) Increases engine speed to manage high RPMs

D) Deactivates the fuel pump to reduce speed

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

B) The centrifugal governor

A) The temperature sensor

D) The crankshaft position sensor

C) The fuel injection pump

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2. High-Temperature Alarm

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

C) To ensure the gearbox remains properly lubricated

A) To prevent the engine from running too cold

D) To monitor the fuel temperature

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

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