Lubricating Oils and Bearings Quiz

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Questions and Answers

Which fuel oil impurity is most likely to cause severe abrasive damage?

Water

Catalytic fines

Sodium

Ash (correct)

What factor primarily explains why centrifugal pumps cannot handle air?

Compressibility (correct)

Viscosity

Fluidity only

Density only

What is the most effective method for achieving complete combustion in main engines?

Injecting vaporized fuel into the combustion chamber

Allowing excess fuel to drain through an overflow

Using a beam of solid fuel against a warm surface (correct)

Using high-pressure fuel directly into the cylinder

If a vessel is turning at 120 RPM with a propeller pitch of 10 feet and 9 inches, what is the calculated engine speed?

13.74 knots Signup and view all the answers

How many RPM will the shaft need to turn if the required speed is 17.4 knots and the propeller pitch is 25.6 feet with a 3% slip?

75 RPM Signup and view all the answers

What is the speed of advance for a propeller with a pitch of 25 feet turning at 93 RPM with no slip?

22.9 knots Signup and view all the answers

What could be the most likely cause of a bilge pump failing to take suction from the Fwd.(P) bilge well?

There is a leak in the suction pipeline Signup and view all the answers

Which device is specifically used to take crankshaft deflection readings?

Bell logger Signup and view all the answers

What type of lubricating oils is generally used in auxiliary engines?

A detergent Signup and view all the answers

How is the thrust bearing lubricated on a Diesel engine?

By its own independent supply system Signup and view all the answers

What is one behavior that can occur to affect the turbocharger when the engine timing is delayed and exhaust temperatures are high?

A higher air and gas temperature after turbocharger Signup and view all the answers

What is the primary function of the thermo-expansion valve in a refrigeration system?

Regulating freon liquid flow to the evaporator Signup and view all the answers

If your vessel burns 4 tons of fuel per hour at 21 knots, how many tons per hour will it burn at 16 knots?

3.0 tons Signup and view all the answers

What is the most likely cause of too low suction pressure in a freon compressor?

Broken suction valve plate Signup and view all the answers

What is the expected engine distance and propeller slip if the pitch of your propeller is 22.25 feet and you have turned 74 RPM for the last 24 hours covering 420 miles?

ED 395 miles / slip 7.7% Signup and view all the answers

What are bearings most likely affected by due to prolonged exposure to high temperature conditions?

Contamination and degradation Signup and view all the answers

What is the correct method to use a torque wrench?

Adjust the handle and set it at a specific level of torque Signup and view all the answers

To warm up a diesel engine that has been idle, what is the appropriate action?

Run at minimum speed for a period of time Signup and view all the answers

If you steamed 265 miles and consumed 25.0 tons of fuel, how much fuel will you consume while steaming 346 miles?

33.01 tons Signup and view all the answers

What does the unit of measure certistokes (cSt) signify regarding fuel?

Viscosity Signup and view all the answers

What is the most likely cause of high discharge pressure from a freon compressor?

Broken discharge valve plate Signup and view all the answers

What is the most probable cause for a bilge pump to fail to take suction from bilge wells but operate from the bilge tank?

Bilge well suction pipeline leaking between valves Signup and view all the answers

How fast is the propeller turning if its pitch is 21.5 feet, speed of advance is 22.5 knots, and slip is -1.5%?

104.5 RPM's Signup and view all the answers

What could be a reason for a diesel engine to fail to restart after changing the fuel filters?

Air trapped in the fuel line Signup and view all the answers

What is a possible cause of damage to a marine pump?

Suction filter cover gasket leakage Signup and view all the answers

Where is the correct point to sample system lube oil for analysis?

Purifier outlets Signup and view all the answers

What should be considered to avoid cold corrosion in a marine boiler burning high sulphur fuel oil?

Flue gas temperature above H2SO4 dew point Signup and view all the answers

In a pressure type lubrication system, where does the lube oil service pump discharge directly?

Lube oil cooler Signup and view all the answers

What is the maximum duration a diesel-driven pump can run at full capacity?

Five hours Signup and view all the answers

What is a suitable feature for an emergency generator expected to start at low ambient temperatures?

Heating arrangement Signup and view all the answers

Which type of lube oil pump is typically used in diesel engines?

Gear pump Signup and view all the answers

What defines the surge limit of a turbocharger?

The characteristic curve on the left of maximum pressure Signup and view all the answers

What is one consequence of excessively high temperatures on lubricating oil quality?

It evaporates the oil, leading to high consumption. Signup and view all the answers

What is the speed of advance for a vessel with a slip of +10%, RPM of 70, and propeller pitch of 19 feet?

11.81 knots Signup and view all the answers

What does an air cooler do in a supercharging system?

It cools the supercharged air to condense and remove moisture. Signup and view all the answers

Which statement best describes the lubrication of main bearings in a four-stroke/cycle diesel engine compared to a two-stroke/cycle diesel engine?

Four-stroke engines have a simpler lubrication process. Signup and view all the answers

What RPM is required to reach a speed of 13.77 knots with a propeller pitch of 19.5 feet and a slip of 7%?

76.8 RPM Signup and view all the answers

What is an effect of overspeeding a diesel engine that drives an electric generator?

It damages the windings. Signup and view all the answers

What will happen if the air cock is not closed when fires are lighted?

It will allow air into the system. Signup and view all the answers

What is an outcome of the oxidation of lubricating oil?

It will increase the oil's viscosity. Signup and view all the answers

Study Notes

Lubrication and Engine Performance

Lube oil contamination negatively impacts bearing condition.
Bearings fail due to prolonged high temperatures and cyclic loading, leading to metal fatigue.
Condition monitoring may indicate no need for oil renewal if the bearings are in perfect condition.

Types of Lubricating Oils for Auxiliary Engines

Common types include detergent, synthetic, alkaline, and semi-synthetic oils.

Fuel Consumption

A vessel burns 4 tons of fuel per hour at 21 knots; it burns 3.0 tons per hour at 16 knots.

Turbocharger Functionality

Turbocharger performance is affected by delayed timing and high exhaust temperatures, causing:
- Higher air and gas temperature post-turbocharger.
- Possible surging of the turbocharger.

Propeller Performance

A propeller with a pitch of 22.25 feet turning at 74 RPM covers an engine distance of 395 miles with a slip of 7.7%.
The relation between engine speed, pitch, and RPM is critical for calculating vessel speed.

Refrigeration System Components

The thermo-expansion valve regulates freon liquid flow to the evaporator and affects suction pressure.

Fuel Oil Impurities

Impurities like ash, sodium, water, and catalytic fines can cause significant abrasive damage when burning fuel.

Centrifugal Pump Limitations

Centrifugal pumps require priming and cannot efficiently handle air due to compressibility, fluidity, and density issues.

Combustion Optimization

Optimal combustion in main engines relies on effective atomization of injected fuel into the combustion chamber.

Engine RPM Calculations

RPM requirements depend on desired speed, propeller pitch, and expected slip, with calculations yielding speeds such as 13.74 knots.

Bilge Pump Operations

Difficulty in suction from certain bilge wells may indicate pipeline leakage or valve issues rather than pump malfunction.

Crankshaft Measurement Tools

Crankshaft deflection readings can be taken using tools like a bell logger or data logger.

Fuel Efficiency Strategies

Reducing consumption from 378 tons to 194 tons requires adjustments in speed and operational efficiency.

Sampling Lube Oil

Lube oil samples for analysis are best taken from tank drains, inlet/outlet of coolers, purifier outlets, or standpipes.

Diesel Engine Lubrication

Gear pumps are commonly used in diesel engines for effective lubrication.

Effects of High Temperatures on Lubrication

Excessive heat can lead to oil evaporation, oxidation, and altered viscosity, all affecting performance.

Turbocharger Surge Limit

Understanding the surge limit is crucial for preventing damage; it involves the compressor characteristic curve and maximum operational pressure.

Emergency Generator Preparedness

Generators need provisions for cold weather, including manual starters and anti-freeze arrangements.

General Engine Maintenance

Properly warming up a diesel engine after idleness is essential for maintaining optimal performance.

Fuel Consumption Calculations

Fuel consumption should be calculated based on distance traveled to predict future fuel needs accurately.

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Description

Test your knowledge on the types of lubricating oils and their impact on bearing performance. This quiz covers crucial factors like contamination, temperature effects, and cyclic loading. Assess your understanding of lubrication and maintenance practices.