Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During the compression stroke of a 4-stroke diesel engine, the piston moves from Bottom Dead Centre (BDC) to Top Dead Centre (TDC). What is the primary objective of this stroke?
The compression stroke aims to compress the fresh air drawn into the cylinder, dramatically increasing its temperature and pressure. This extreme heat is crucia
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Question: During the compression stroke of a 4-stroke diesel engine, the piston moves from Bottom Dead Centre (BDC) to Top Dead Centre (TDC). What is the primary objective of this stroke?
Answer options: ✅ To significantly increase the temperature and pressure of the intake air.
- To expel exhaust gases from the cylinder through the open exhaust valve.
- To ignite the fuel-air mixture and produce mechanical work.
- To draw fresh air into the cylinder through the open intake valve.
Correct answer: To significantly increase the temperature and pressure of the intake air.
Explanation: The compression stroke aims to compress the fresh air drawn into the cylinder, dramatically increasing its temperature and pressure. This extreme heat is crucial for the auto-ignition of diesel fuel once injected, which is fundamental to the diesel combustion process. This is the core function before fuel injection and combustion occur.
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