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Questions and Answers
What is the required range of starting air pressure for both the main propulsion engines and the auxiliary engines?
What is the required range of starting air pressure for both the main propulsion engines and the auxiliary engines?
- Between 20 and 35 bars
- Between 40 and 50 bars
- Between 25 and 42 bars (correct)
- Between 15 and 30 bars
When does the starting air valve begin to open in 4-stroke engines?
When does the starting air valve begin to open in 4-stroke engines?
- At TDC
- 180 degrees after TDC
- 90 degrees after TDC
- 4 degrees before TDC (correct)
What is the purpose of providing a minimum overlap of 15 degrees during the starting air sequence?
What is the purpose of providing a minimum overlap of 15 degrees during the starting air sequence?
- To increase the starting air pressure
- To prevent the engine from starting
- To ensure that at least one valve will open when the starting air is inducted (correct)
- To close all starting air valves
What is the time period for the induction of starting air in 4-stroke engines?
What is the time period for the induction of starting air in 4-stroke engines?
Flashcards
Starting air pressure range
Starting air pressure range
25 to 42 bars for both main and auxiliary engines
Valve opening (4-stroke)
Valve opening (4-stroke)
4 degrees before Top Dead Center (TDC)
Overlap purpose (starting air)
Overlap purpose (starting air)
Ensures valve opening during starting air induction
Starting air induction time (4-stroke)
Starting air induction time (4-stroke)
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Study Notes
Engine Starting Air Pressure
- The required range of starting air pressure for main propulsion engines is not specified in the text.
- The required range of starting air pressure for auxiliary engines is not specified in the text.
Starting Air Valve Operation
- The starting air valve begins to open during the compression stroke in 4-stroke engines.
Overlap During Starting Air Sequence
- A minimum overlap of 15 degrees is required during the starting air sequence to ensure sequential engine starting and prevent simultaneous starting of all units.
Induction of Starting Air
- The time period for the induction of starting air in 4-stroke engines is during the compression stroke, before the top dead center.
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Description
Test your knowledge of marine engine operations with this quiz. Explore topics such as starting air pressure range, induction timing, and exhaust valve operation in 4-stroke engines. Perfect for marine engineering enthusiasts and professionals.
