🔍 Key Concepts
• Diesel engine air-fuel ratio and how lack of air affects combustion
• Relationship between air intake, power output, and engine speed
• Typical causes of knocking, surging, or overspeed in diesel engines
💭 Think About
• Think about what happens to combustion when there is not enough air but the same amount of fuel is being injected.
• Which of the listed symptoms is most likely tied to too little oxygen in the cylinders rather than to fuel system or governor problems?
• Consider which options (knocking, surging, overspeed, low speed) usually come from fuel or governor issues, not air restriction.
✅ Before You Answer
• Verify which effect is directly linked to reduced power output from incomplete combustion.
• Check which symptoms (knocking, surging, overspeed) are more commonly associated with fuel timing, fuel quality, or governor malfunctions, not air restriction.
• Confirm which choice best matches a general loss of engine breathing capacity (restricted intake).