MDE 7 End of Unit Quiz

MDE 7 End Of Unit Quiz

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Safety Cut-Outs/Trips for Diesel Engines

Question 1: What is the primary function of an overspeed trip in a diesel engine?

D) To adjust the intake air flow

B) To stop the engine if it exceeds a specified speed

C) To monitor the engine oil temperature

A) To control the fuel injection rate

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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

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

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

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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?

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

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

C) Replace the temperature sensor with a new one

D) Reset the alarm and shutdown system to factory settings

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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

A) Checking the engine coolant level

C) Replacing the engine oil filter

D) Calibrating the turbocharger pressure

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4. Shaft Brake

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

A) To slow down the engine in an emergency

D) To reduce vibration in the engine room

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

C) To increase fuel efficiency during low-speed operations

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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

A) Permanently increase the engine's lubricating oil pressure

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

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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?

D) Adjust the engine speed to match the set points

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

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

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

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3. Overload Clutch

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

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

A) To increase the engine’s fuel efficiency

C) To maintain a constant engine speed

D) To ensure smooth gear shifting

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Low Fuel Level Cut-Out

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

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

C) Allows the engine to continue operating until the fuel level is critically 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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Question 4: What happens to the centrifugal overspeed trip mechanism if the engine speed returns to normal after an overspeed condition?

A) The trip mechanism remains engaged until manually reset

B) The trip mechanism automatically resets once the speed decreases

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

D) The mechanism continues to trip intermittently

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Question 2: Which safety cut-out is designed to prevent engine operation in the event of low oil pressure?

D) High exhaust temperature trip

B) High-temperature trip

A) Oil pressure cut-out

C) Low coolant level sensor

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6. Vibration Sensor

Question: What is the purpose of a vibration sensor on a propulsion engine?

C) To ensure the engine operates at the correct speed

D) To regulate the engine temperature

A) To reduce noise levels in the engine room

B) To monitor and detect abnormal vibrations that could indicate mechanical failure

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