Podcast
Questions and Answers
Which fuel oil impurity is most likely to cause severe abrasive damage?
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?
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?
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?
If a vessel is turning at 120 RPM with a propeller pitch of 10 feet and 9 inches, what is the calculated engine speed?
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?
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?
What is the speed of advance for a propeller with a pitch of 25 feet turning at 93 RPM with no slip?
What is the speed of advance for a propeller with a pitch of 25 feet turning at 93 RPM with no slip?
What could be the most likely cause of a bilge pump failing to take suction from the Fwd.(P) bilge well?
What could be the most likely cause of a bilge pump failing to take suction from the Fwd.(P) bilge well?
Which device is specifically used to take crankshaft deflection readings?
Which device is specifically used to take crankshaft deflection readings?
What type of lubricating oils is generally used in auxiliary engines?
What type of lubricating oils is generally used in auxiliary engines?
How is the thrust bearing lubricated on a Diesel engine?
How is the thrust bearing lubricated on a Diesel engine?
What is one behavior that can occur to affect the turbocharger when the engine timing is delayed and exhaust temperatures are high?
What is one behavior that can occur to affect the turbocharger when the engine timing is delayed and exhaust temperatures are high?
What is the primary function of the thermo-expansion valve in a refrigeration system?
What is the primary function of the thermo-expansion valve in a refrigeration system?
If your vessel burns 4 tons of fuel per hour at 21 knots, how many tons per hour will it burn at 16 knots?
If your vessel burns 4 tons of fuel per hour at 21 knots, how many tons per hour will it burn at 16 knots?
What is the most likely cause of too low suction pressure in a freon compressor?
What is the most likely cause of too low suction pressure in a freon compressor?
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?
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?
What are bearings most likely affected by due to prolonged exposure to high temperature conditions?
What are bearings most likely affected by due to prolonged exposure to high temperature conditions?
What is the correct method to use a torque wrench?
What is the correct method to use a torque wrench?
To warm up a diesel engine that has been idle, what is the appropriate action?
To warm up a diesel engine that has been idle, what is the appropriate action?
If you steamed 265 miles and consumed 25.0 tons of fuel, how much fuel will you consume while steaming 346 miles?
If you steamed 265 miles and consumed 25.0 tons of fuel, how much fuel will you consume while steaming 346 miles?
What does the unit of measure certistokes (cSt) signify regarding fuel?
What does the unit of measure certistokes (cSt) signify regarding fuel?
What is the most likely cause of high discharge pressure from a freon compressor?
What is the most likely cause of high discharge pressure from a freon compressor?
What is the most probable cause for a bilge pump to fail to take suction from bilge wells but operate from the bilge tank?
What is the most probable cause for a bilge pump to fail to take suction from bilge wells but operate from the bilge tank?
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%?
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%?
What could be a reason for a diesel engine to fail to restart after changing the fuel filters?
What could be a reason for a diesel engine to fail to restart after changing the fuel filters?
What is a possible cause of damage to a marine pump?
What is a possible cause of damage to a marine pump?
Where is the correct point to sample system lube oil for analysis?
Where is the correct point to sample system lube oil for analysis?
What should be considered to avoid cold corrosion in a marine boiler burning high sulphur fuel oil?
What should be considered to avoid cold corrosion in a marine boiler burning high sulphur fuel oil?
In a pressure type lubrication system, where does the lube oil service pump discharge directly?
In a pressure type lubrication system, where does the lube oil service pump discharge directly?
What is the maximum duration a diesel-driven pump can run at full capacity?
What is the maximum duration a diesel-driven pump can run at full capacity?
What is a suitable feature for an emergency generator expected to start at low ambient temperatures?
What is a suitable feature for an emergency generator expected to start at low ambient temperatures?
Which type of lube oil pump is typically used in diesel engines?
Which type of lube oil pump is typically used in diesel engines?
What defines the surge limit of a turbocharger?
What defines the surge limit of a turbocharger?
What is one consequence of excessively high temperatures on lubricating oil quality?
What is one consequence of excessively high temperatures on lubricating oil quality?
What is the speed of advance for a vessel with a slip of +10%, RPM of 70, and propeller pitch of 19 feet?
What is the speed of advance for a vessel with a slip of +10%, RPM of 70, and propeller pitch of 19 feet?
What does an air cooler do in a supercharging system?
What does an air cooler do in a supercharging system?
Which statement best describes the lubrication of main bearings in a four-stroke/cycle diesel engine compared to a two-stroke/cycle diesel engine?
Which statement best describes the lubrication of main bearings in a four-stroke/cycle diesel engine compared to a two-stroke/cycle diesel engine?
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%?
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%?
What is an effect of overspeeding a diesel engine that drives an electric generator?
What is an effect of overspeeding a diesel engine that drives an electric generator?
What will happen if the air cock is not closed when fires are lighted?
What will happen if the air cock is not closed when fires are lighted?
What is an outcome of the oxidation of lubricating oil?
What is an outcome of the oxidation of lubricating oil?
Flashcards
Bearing Failure Causes
Bearing Failure Causes
Prolonged high temperatures and cyclic loading can lead to metal fatigue and bearing failure.
Types of Lubricating Oils
Types of Lubricating Oils
Detergent, synthetic, alkaline, and semi-synthetic oils are common types used in auxiliary engines.
Turbocharger Performance Issues
Turbocharger Performance Issues
Higher air and gas temperatures and possible turbocharger surging can occur.
Thermo-Expansion Valve
Thermo-Expansion Valve
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Fuel Oil Impurities
Fuel Oil Impurities
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Centrifugal Pump Limitations
Centrifugal Pump Limitations
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Optimal Combustion
Optimal Combustion
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Engine RPM Calculation
Engine RPM Calculation
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Bilge Pump Suction Issues
Bilge Pump Suction Issues
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Crankshaft Measurement
Crankshaft Measurement
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Lube Oil Sampling
Lube Oil Sampling
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Diesel Engine Lubrication Pumps
Diesel Engine Lubrication Pumps
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Effects of High Temperatures on Lubrication
Effects of High Temperatures on Lubrication
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Turbocharger Surge Limit
Turbocharger Surge Limit
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Emergency Generator Preparedness
Emergency Generator Preparedness
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Diesel Engine Warm-Up
Diesel Engine Warm-Up
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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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