MDE Unit 16 engine faults Flashcards

MDE Unit 16 engine faults

Question 4:

A decrease in the oil level of a main engine sump over time might indicate which of the following?

A. Oil consumption due to combustion chamber blow-by

Question 3:

What is a critical step in preparing the fuel system of a main propulsion engine before going to sea?

C. Purging air from the fuel lines to prevent engine misfires

Question 1:
What is a potential consequence of the air start pipework becoming extremely hot?

B. Damage to the pipework or surrounding components

Question 2:

What might cause the oil level in a main engine sump to rise unexpectedly?

A. Water contamination in the oil

Question:
Which of the following is an effective remedy for the burning of lubricating oil in marine diesel engines?

A. Replace worn piston rings

Question 3:
Which maintenance practice can help minimize the chances of turbocharger vibration?

B) Regularly cleaning the turbine and compressor wheels

Question 1: What is the first step to take upon discovering a leaking cylinder air start valve while the engine is running?

C) Shut down the engine and isolate the affected cylinder

Question 4:
What might cause abnormal turbocharger vibration at a steady speed in a diesel engine?

B) Worn bearings in the turbocharger

Question 3:

Which of the following is a potential reason for fluctuating oil levels in the main engine sump during operation?

C. Variations in engine load

Question 5:
What happens if the fluid level in a fluid coupling is too low?

C) The coupling will slip excessively, reducing power transmission.

Question 2:
What immediate action should be taken if the air start pipework is becoming extremely hot?

C. Check for and clear any obstructions in the pipework

Question 5:

What might be the cause of a high-pitched squealing noise in a diesel engine?

A. Loose or worn-out fan belt

Question:
What is a common remedy for improving cold starting of marine diesel engines?

C. Ensure the use of preheaters or glow plugs

Question 2:

If a diesel engine is experiencing unstable speed due to air intake issues, what is the most likely cause?

B) Dirty or blocked air filter

Question 1:

Which of the following is a possible cause of knocking noise in a diesel engine during operation?

A. Incorrect fuel injection timing

Question 2:

Which of the following could cause a cylinder air start valve to leak?

B) Build-up of carbon deposits on the valve

Question 3:
In a fluid coupling, what role does the impeller play?

A) It acts as the driving component, transmitting power from the engine.

Question 5:

Which of the following scenarios could lead to a false high oil level reading in the main engine sump?

C. Improperly seated dipstick

Which of the following are possible causes for blue smoke in marine diesel engines? (Select TWO)

 

B. Burning of lubricating oil, D. Worn piston rings

Which of the following are possible causes for black smoke in marine diesel engines? (Select TWO)

A. Excessive fuel injection, B. Insufficient air supply

Question 1:
Which of the following is an effective way to minimize the risk of abnormal turbocharger vibration in a diesel engine?

B) Ensuring proper alignment of the turbocharger shaft

Question 3: If debris is found to be the cause of the air start valve leak, what is the recommended procedure?

B) Clean the valve and seating area, and then reinstall

Question 1:

What could be a common cause of unstable engine speed related to the fuel system?

B) Malfunctioning fuel injectors

Question:
Which of the following are possible causes for white smoke in marine diesel engines? (Select TWO)

A. Water in the fuel, E. Cold starting of the engine

Question 3:

Which of the following could cause a whining noise in a diesel engine during operation?

C. Damaged turbocharger

Question 4: What should be done if the air start valve continues to leak after cleaning and inspection?

B) Replace the air start valve with a new one

Question 5:

If unstable engine speed is caused by a problem with the turbocharger, what should be checked?

A) Turbocharger oil supply

Question 1:
Which of the following is a method to minimize the risk of abnormal turbocharger vibration due to unbalanced rotors?

B. Regularly balancing the turbocharger rotor assembly

Question 4:

Which condition may lead to a cylinder air start valve leak?

B) Corrosion or pitting of the valve components

Question 3:

What action should be taken if low coolant levels are causing engine overheating?

B) Add coolant to the system

Question 2:
Which of the following could lead to abnormal turbocharger vibration in a diesel engine operating at a steady speed?

C) Misalignment of the turbocharger shaft

Question 2:
What maintenance practice can help prevent abnormal turbocharger vibration caused by fouling?

C. Ensuring regular cleaning of the turbine and compressor blades

Question:
Which of the following is an effective remedy for excessive fuel injection in marine diesel engines?

D. Reduce the fuel pump delivery rate

Question 6:

What could be the effect of a malfunctioning oil pressure relief valve on oil pressure, and how should it be addressed?

A) It can cause high oil pressure; adjust or replace the relief valve

Question 6:

What could be a mechanical cause of unstable engine speed, and how can it be fixed?

A) Worn camshaft; replace the camshaft

Question 4:

How can issues with the fuel supply system lead to unstable engine speed, and what is the appropriate remedy?

A) Fuel contamination; replace the fuel filter

Question 1:
What is the primary function of a fluid coupling in a marine propulsion system?

B) To allow for smooth transmission of power by using fluid dynamics

Question: How can a leaking cylinder air start valve be detected while the engine is running?

D) By monitoring for a hissing sound near the air start valve manifold

Question:

Which of the following actions can help avoid spurious sump level alarms in a marine diesel engine?

A. Regular calibration and testing of the level sensor

Question 4:

What should be checked if low lubricating oil pressure is suspected due to oil level issues?

B) Oil level in the engine

Question 3:
Abnormal turbocharger vibration while operating at a steady speed could be caused by:

B) Build-up of deposits on the turbine wheel

Question 3:

What is a potential cause of unstable engine speed related to the engine's electronic control system?

B) Faulty engine control unit (ECU)

Question 2:
Which fluid is most commonly used in a fluid coupling for marine propulsion?

B) Engine oil

Question 6:

What could be a consequence of a blocked or restricted air intake on engine temperature, and how can it be fixed?

A) It can cause overheating; clean or replace the air filter

Question:
With reference to fluid couplings for the main propulsion shaft, how may the transmitted torque be varied?

B) By changing the fluid viscosity in the coupling

Question 4:

A diesel engine is producing a thumping noise during operation. Which of the following is a probable cause?

A. Broken engine mounts

Question 4:

Which of the following is an important check to perform on the main propulsion system's gearbox before departure?

D. All of the above

Question 4:

How can a malfunctioning water pump lead to overheating, and what is the recommended solution?

B) It can restrict coolant flow; replace the water pump

Question 7:

If an engine is overheating due to a failing radiator fan, what should be the corrective action?

B) Repair or replace the radiator fan

Question 7:

How can a leaking oil line or gasket contribute to low lubricating oil pressure, and what is the appropriate solution?

A) It allows oil to escape; repair or replace the damaged line or gasket

Question 3:

What could be a potential cause of a leaking cylinder air start valve?

B) Debris lodged in the valve seat

Question:
How can the problem of excessively hot air start pipework on a diesel engine be minimized?

B. Ensure proper insulation of the pipework

Question 2: If high bearing temperature persists after reducing engine load, what should be the next step?

B) Check the lubricating oil flow and pressure

Question 2: What could be a reason for high bearing temperatures in a diesel engine due to issues with the lubricating oil?

A) Low oil viscosity

Question 2:

What could be a likely cause of a rattling noise coming from the top end of a diesel engine?

A. Loose or worn-out valve lifters

Question 4: After stopping the engine due to high bearing temperature, what is a critical check that should be performed before restarting?

B) Inspect the bearing for signs of overheating or damage

Question 1:

What is a common cause of diesel engine overheating related to the cooling system?

C) Clogged radiator or coolant passages

Question 1:

Which of the following is a common cause of a leaking cylinder air start valve?

B) Worn or damaged valve seating

Question 5:
To reduce the likelihood of abnormal turbocharger vibration, which of the following should be done during routine maintenance?

B) Inspect for and promptly replace damaged or loose turbine blades

Question 3:

How can a blocked oil filter lead to low lubricating oil pressure, and what is the appropriate remedy?

A) It restricts oil flow; replace the oil filter

Question 1: What is the first action that should be taken if a high bearing temperature is detected in a diesel engine during operation?

C) Reduce engine speed and load to minimize heat generation

Question 2:
To prevent abnormal turbocharger vibration, it is important to regularly:

B) Inspect and replace worn bearings in the turbocharger

Question 5:

Before leaving port, why is it important to conduct a test run of the main propulsion engine?

B. To ensure that all systems are operating correctly and respond as expected

Question 2: After shutting down the engine due to a leaking air start valve, what should be done next?

B) Inspect the valve and seating area for damage or debris

Question 4:
How does a fluid coupling protect the marine engine from shock loads?

B) By absorbing and dissipating energy through the fluid, reducing stress on the engine

Question 5: Which of the following could cause high bearing temperatures due to maintenance-related issues?

C) Insufficient clearance between the bearing and shaft

Question 2:

Which of the following is a remedy for low lubricating oil pressure due to worn engine bearings?

C) Rebuild or replace the engine bearings

Question 5:

If low lubricating oil pressure is caused by excessive oil viscosity, what is the recommended action?

B) Change the oil to a lower viscosity grade

Question 3: High bearing temperatures in a diesel engine can result from:

C) Contaminated lubricating oil

Question 3:
How can the likelihood of abnormal turbocharger vibration due to bearing wear be minimized?

B. Ensuring adequate lubrication and regular inspection of turbocharger bearings

Question 1: Which of the following is a potential cause of high bearing temperatures in a diesel engine?

B) Improper alignment of the bearing

Question:
Which of the following is an effective remedy for insufficient air supply in marine diesel engines?

A. Clean or replace the air filters

Question 5:

If a diesel engine is overheating due to excessive engine load, what should be done to remedy the situation?

A) Reduce engine load

Question 4:
How can you minimize abnormal turbocharger vibration caused by shaft misalignment?

B) By regularly checking and adjusting the shaft alignment

Question 4: A possible cause of high bearing temperatures due to operational issues could be:

C) Overloading the engine beyond its design capacity

Question 7:

If unstable engine speed is caused by a malfunctioning governor, what is the recommended solution?

C) Replace the governor

Question 1:

Which of the following could cause a sudden drop in the oil level of a main engine sump?

A. Oil leakage from a defective gasket or seal

Question 2:

If a diesel engine is overheating due to a malfunctioning thermostat, what is the appropriate remedy?

B) Replace the thermostat

Question:
The air start pipework on a diesel engine attached to the cylinder head is becoming extremely hot. What is the most probable cause?

D. Blockage or restriction in the air start pipework

Question 1:

Which of the following checks should be performed on the main propulsion system's lubricating oil system before going to sea?

D. All of the above

Question 1:

What is a common cause of low lubricating oil pressure in a diesel engine?

B) Oil pump failure

Question:
How can combustion defects in a diesel engine be diagnosed?

B. By inspecting the color of exhaust smoke

Question 3: Which of the following could be a possible cause of high bearing temperature in a diesel engine?

B) Improper alignment of the bearing

Question 2:

Before departure, which of the following actions should be taken to ensure the correct operation of the main engine cooling water system?

D. All of the above

Question 4:
What is the most effective way to reduce the risk of abnormal turbocharger vibration caused by misalignment during assembly?

B. Ensuring precision alignment during turbocharger installation

Question 1:
What is a potential cause of abnormal turbocharger vibration at a steady speed in a diesel engine?

B) Loose or damaged turbine blades

Question 3:
Which safety precaution should be taken when dealing with hot air start pipework?

A. Allow the pipework to cool before handling
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