MDE Unit 10 lubricating oil Flashcards

1. What are the main functions of diesel engine lubricating oil? (Select all that apply)

A) Reduces friction between engine components, C) Cools engine components by carrying away heat, D) Cleans engine parts by suspending contaminants, F) Protects engine parts from corrosion and rust

How can problems with high ambient temperature affecting a gearbox be remedied? (Select THREE)

A) Improve ventilation or cooling systems around the gearbox, B) Use high-temperature resistant lubricants, D) Reduce the gearbox's operational speed

Question 3:

What does a low pour point in lubricating oil signify?

A) The oil remains fluid and pumpable at low temperatures

Question 3: How can the accumulation of sludge and deposits in diesel engine lubricating oil be minimized?

B) Ensuring proper filtration and regular filter changes

5. Which lubrication method is typically used in medium-speed diesel engines to ensure consistent oil delivery and cooling?

B) Forced circulation lubrication

2. How does splash lubrication work for cylinder liners in medium-speed diesel engines?

B) Oil is splashed onto the cylinder liners by the movement of engine components

1. Which of the following contaminants in diesel engine lubricating oil can lead to increased wear on engine components?

A) Water, C) Silicon

1. What are the potential effects of excessive lubrication in a diesel engine?

C) Increased risk of oil foaming: Which can lead to reduced lubrication efficiency and potential engine damage.

Question 1: What is a common cause of water contamination in diesel engine lubricating oil during service on a marine vessel?

B) Condensation of water vapor

1. What does hydrostatic lubrication refer to in engine lubrication systems?

A) A method where oil is forced under pressure between surfaces to create a lubricating film, eliminating metal-to-metal contact.

1. What is ONE advantage of using grease as a lubricant in a plain bearing?

A) Grease provides continuous lubrication without the need for external oil supplies.

1. Which of the following is a common method for lubricating cylinder liners in medium-speed diesel engines?

B) Forced circulation lubrication

1. What are the potential effects of insufficient lubrication in a diesel engine?

A) Increased friction and wear: Leads to overheating and premature component failure.

2. What effect does the presence of fuel dilution in diesel engine lubricating oil typically have?

C) Leads to increased oil consumption and potential for engine damage

How can problems with insufficient oil level in a gearbox be remedied? (Select TWO)

A) Add oil to the gearbox until it reaches the recommended level, D) Regularly check and maintain the oil level

Question 4:

Which property of lubricating oil is important for neutralizing acids formed during combustion?

B) Total Base Number (TBN)

Question 4: Which of the following is a recommended action to prevent the oxidation of diesel engine lubricating oil?

B) Keeping the oil free from moisture

Why are large quantities of lubricating oil used in a gearbox?

A) To ensure adequate cooling and prevent overheating of gearbox components

1. Which of the following are functions of lubricating oil in a diesel engine? (Select FOUR)

A) Reduces friction between moving parts, B) Acts as a coolant to lower engine temperatures, C) Cleans the engine by removing contaminants, F) Prevents corrosion and rust on engine parts

1. What does boundary lubrication refer to in lubrication systems?

B) A lubrication condition where the lubricant film is so thin that surfaces make intermittent contact, and additives in the oil help reduce wear.

Question 2:

Why is a high flash point important for lubricating oil used in diesel engines?

A) To prevent premature ignition and reduce fire risk

How can problems with inadequate oil flow or circulation in a gearbox be remedied? (Select THREE)

A) Regularly inspect and clean the oil filters, C) Increase the oil level to the recommended amount, E) Replace worn or damaged oil pumps

Which property of lubricating oil is crucial for preventing metal-to-metal contact between engine components?

A) Viscosity

Question: Upon detecting the early signs of microbial degradation in the main engine lubricating oil, which TWO actions should be taken?

B) Add a biocide to the lubricating oil, D) Monitor the oil condition more frequently

4. What is the primary concern with high levels of water contamination in diesel engine lubricating oil?

B) Promotes corrosion and rust formation on engine components

How can problems with excessive friction due to worn or misaligned gears in a gearbox be remedied? (Select TWO)

A) Replace worn or damaged gears, C) Adjust or realign misaligned gears

3. What is the primary advantage of forced circulation lubrication over splash lubrication in medium-speed diesel engines?

B) Ensures more uniform oil distribution and control of oil flow

5. Which contaminant is typically associated with high levels of silicon in diesel engine lubricating oil?

B) Increased wear from abrasive particles

Question 3: Which factor is a primary contributor to fuel dilution in diesel engine lubricating oil during service?

A) Prolonged idling of the engine

Question 5:

Why is it important for lubricating oil to have a high oxidation resistance?

A) To prevent oil degradation and maintain performance over time

4. In forced circulation lubrication systems, how is oil delivered to the cylinder liners?

B) By a mechanical pump that circulates oil through the engine

1. What is ONE disadvantage of using grease as a lubricant in a plain bearing?

A) Grease can become less effective at high temperatures compared to oil.

Question 2: Which of the following practices is essential for preventing contamination of diesel engine lubricating oil?

B) Regular oil analysis and monitoring

Question: Which of the following are indications that lubricating oil is suffering from microbial degradation? (Select FOUR)

A) Presence of sludge in the oil, B) Unusual or foul odor from the oil, C) Increase in oil viscosity, D) Discoloration of the oil

3. How does the presence of soot in diesel engine lubricating oil affect engine performance?

B) Increases the risk of abrasive wear and reduces oil life

Question 5: What role does maintaining proper oil levels play in keeping diesel engine lubricating oil in a satisfactory condition?

C) It ensures adequate lubrication of engine components.

Question 4: How might microbial contamination occur in diesel engine lubricating oil during service on a marine vessel?

C) Presence of water in the oil

Question 1: What is one of the most effective methods for maintaining the condition of diesel engine lubricating oil?

C) Maintaining proper oil temperature

Which of the following are possible causes of excessive lubricating oil temperature in a gearbox when operating at normal speeds? (Select FOUR)

A) Inadequate oil flow or circulation, B) Excessive friction due to worn or misaligned gears, C) High ambient temperature, E) Insufficient oil level

Question 2: Which of the following contaminants is most likely to enter diesel engine lubricating oil due to wear and tear of engine components?

B) Metallic particles

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