MDE 7 Q5

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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?

D) Completely drain the lubricating oil from the engine

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

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

A) Increase the engine speed to maximum RPM

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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

D) Manually shut down the engine and report the fault

B) Immediately replace the pressure sensor and restart the test

A) Increase the pressure further until the engine stalls

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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

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

A) Permanently increase the engine's lubricating oil pressure

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

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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?

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

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

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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

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

D) To decrease the engine's operating temperature

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