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Ship Engine: Combustion and Efficiency

Ship Engine: Combustion and Efficiency

This content covers key aspects of ship engines, focusing on combustion chamber volume ratios, the impact of early fuel injection on mean indicated pressure, and the role of mechanical loss coefficients. Study these relationships to understand engine performance. Review the impact of heating surface.

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Ship Engine: Combustion and Efficiency

Quiz • 30 Questions

Ship Engine: Combustion and Efficiency - Flashcards

Flashcards • 30 Cards

Study Notes

11 min • Summary

Materials

List of Questions30 questions
  1. Question 1
    • The degree of compression
    • The extent of discharge
    • The cetane number
    • The working volume
  2. Question 2
    • The mean indicated pressure fluctuates unpredictably
    • The mean indicated pressure increases
    • The mean indicated pressure decreases
    • The mean indicated pressure remains unchanged
  3. Question 3
    • Economizer
    • Steam dryer
    • Additional heating surface
    • Steam heater
  4. Question 4
    • Misalignment of the main bearings
    • Inaccuracy in the alignment of the cylinder-piston group
    • Crank pin bearings misalignment
    • Shaft wear
  5. Question 5
    • To avoid high temperature in the combustion chamber
    • To maintain constant pressure of the feeding oil
    • To feed cylinder oil at a specific position of the piston
    • To feed cylinder oil with constant debit
  6. Question 6
    • If the working medium is an ideal gas
    • There are two thermal sources with constant temperatures
    • There are two thermal sources with variable temperatures
    • There are two thermal sources with different temperatures
  7. Question 7
    • Axial, radial
    • Reactive
    • One stage, multiple stages
    • One body, multiple bodies
  8. Question 8
    • Dynamic type
    • Distributive type
    • Displacement type
    • Gear- and piston-type
  9. Question 9
    • Gravity and circulation
    • Gravity and bypass
    • Low and high pressure oil systems
    • Closed/opened
  10. Question 10
    • Increase in density, reduction in temperature
    • Increase in specific volume, reduction in temperature
    • Decrease in specific volume, increase in temperature
    • Increase in specific volume and density, reduction in temperature
  11. Question 11
    • Tin copper
    • Brass
    • Black copper
    • Bronze
  12. Question 12
    • Instant fuel consumption
    • Nothing of the listed
    • The cycle portion of fuel
    • Turbounit revolutions
  13. Question 13
    • Yes, they are
    • No, only high-power four-stroke
    • No, only with mechanical starter
    • No, only with electric starter
  14. Question 14
    • The first phase delay of self-ignition
    • Second phase (spontaneous combustion and rapid combustion)
    • Third (moderate combustion with slow pressure reduction)
    • The first and second phases
  15. Question 15
    • It remains constant with engine rpm
    • It decreases with engine rpm
    • It doesn't change with engine rpm
    • It increases with engine rpm
  16. Question 16
    • There is no such requirement
    • 7 °C
    • 15 °C
    • 18 °C
  17. Question 17
    • When the temperature of the steam is increased
    • When the steam capacity of the boiler is increased
    • When the steam capacity of the boiler is reduced
    • When steam is supplied to the turbine by closing the main maneuvering valve
  18. Question 18
    • Sodium salts introduced with feed water
    • Magnesium and calcium salts introduced with feed water
    • The water treatment chemicals
    • Chlorine salts introduced with feed water
  19. Question 19
    • Multi-contour boilers
    • Smoky boilers
    • Firetube boilers
    • Exhaust gas boiler
  20. Question 20
    • Welding
    • Cold drawing
    • All the above
    • Turning
  21. Question 21
    • To prevent micro-organism development
    • To reduce deposits
    • To increase heat exchange
    • Chlorine is not added
  22. Question 22
    • It is possible to
    • Only with small T/C
    • Not possible
    • Only possible with large T/C
  23. Question 23
    • Only with electric starter
    • Only possible with small T/C
    • No, they are not
    • Only for high output engines
  24. Question 24
    • No, there isn't
    • Yes, there is
    • Only very high power turbines have
    • Only low power turbines have
  25. Question 25
    • They are tightened several times with a certain force during a certain period of time
    • It does not matter
    • They are tightened once, one after the other with different force
    • They are tightened once, all bolts one after the other with a certain force
  26. Question 26
    • From BDC to TDC
    • From TDC to BDC
    • As it moves around the TDC
    • When moving around BDC
  27. Question 27
    • All listed
    • Increases thermal load
    • Increases mechanical load
    • Increases specific fuel consumption
  28. Question 28
    • If the exhaust valve's clearance decreases
    • If the engine load increases
    • If the lubricating oil temperature is reduced
    • If the exhaust valve leaks
  29. Question 29
    • "A" shaped frame
    • The cylinder block
    • Crankcase
    • The foundation frame
  30. Question 30
    • It decreases till it reaches the minimum
    • It decreases then remains constant
    • It doesn't change
    • It increases till it reaches the optimum
List of Flashcards30 flashcards
  1. Card 1
    HintThis ratio determines how much air and fuel mixture is compressed before ignition.Memory TipCompression: Volume ratio.
  2. Card 2
    HintThink about why precise lubrication is important for piston movement.Memory TipPiston oil: Precise timing.
  3. Card 3
    HintConnect this to the concept of heat engines and efficiency.Memory TipIdeal gas: Temp difference.
  4. Card 4
    HintConsider the effect of cooling on gas properties.Memory TipCooling air: Volume up, temp down.
  5. Card 5
    HintIt's a common metal alloy, often used in ancient times.Memory TipBronze: Copper + Tin.
  6. Card 6
    HintWhat aspect of fuel use would reflect how hard the engine is working?Memory TipFuel cycle: Engine load.
  7. Card 7
    HintHow do these engines often get their initial rotation?Memory TipFour-stroke: Compressed air start.
  8. Card 8
    HintWarmer air affects how quickly fuel ignites.Memory TipHot air: Faster self-ignition.
  9. Card 9
    HintConsider the stability of engine operation at certain speeds.Memory TipHigh RPM: Stable piston wear.
  10. Card 10
    HintWhat's the lowest acceptable temperature for engine startup?Memory TipEngine start: 7 degrees C.
  11. Card 11
    HintWhat common impurities in water cause hardness?Memory TipHard water: Sodium salts.
  12. Card 12
    HintThese boilers recycle waste heat.Memory TipEngine heat: Exhaust gas boiler.
  13. Card 13
    HintWhy is chlorine used in water treatment?Memory TipChlorine: Kills microbes.
  14. Card 14
    HintThink beyond the turbocharger itself, what external issues could affect it?Memory TipSurging: External factors.
  15. Card 15
    HintHow do four-stroke engines get their initial push to start running?Memory TipFour-stroke: Compressed air.
  16. Card 16
    HintWhich direction of piston movement is associated with compression?Memory TipTDC to BDC: Compression.
  17. Card 17
    HintIf an engine works harder, what happens to fuel use?Memory TipMore load: More fuel.
  18. Card 18
    HintConsider the relationship between engine component temperatures.Memory TipLower lube oil: Cooler exhaust.
  19. Card 19
    HintWhere would these critical guides be securely mounted?Memory TipGuides: Foundation frame.
  20. Card 20
    HintWhat's the impact of early ignition on engine efficiency?Memory TipEarly combustion: Efficiency down.
  21. Card 21
    HintWhat physical properties of the refrigerant would indicate this condition?Memory TipWet stroke: Freon P/T.
  22. Card 22
    HintHow does swirling air impact combustion efficiency?Memory TipVortex air: Better compression.
  23. Card 23
    HintHow does more air affect corrosive agents in combustion?Memory TipMore air: Less corrosion.
  24. Card 24
    HintWhat's the effect of having more air than needed for combustion on engine stresses?Memory TipMore air: Less thermal stress.
  25. Card 25
    HintHow is the liner secured at its top?Memory TipLiner: Flange collar.
  26. Card 26
    HintHow are large boilers held in place on a ship?Memory TipBoiler: Bolts and dampers.
  27. Card 27
    HintHow is the liner held within the engine block?Memory TipLiner: Pressed in.
  28. Card 28
    HintWhat's the minimum safe temperature for lubricant ignition?Memory TipLube oil: 250 degree flash.
  29. Card 29
    HintHow many distinct circuits does the oil system have?Memory TipTurbine oil: Multi-loop.
  30. Card 30
    HintHow many gauges are typically needed for monitoring boiler pressure?Memory TipBoiler: Three gauges.

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