Question

In a diesel engine, the fuel is ignited by

• A. spark
• B. injected fuel
• C. heat resulting from compressing air that is supplied for combusion
• D. ignition

Answer 1

Answer: (C)

heat resulting from compressing air that is supplied for combusion

In a diesel engine , the mixture (fuel vapour+ air) , which is mostly air , is compressed by piston , due to this high pressure by piston , heat is produced and temperature reaches to fuel's ignition temperature and combustion starts . Hence in a diesel engine , the fuel is ignited by heat resulting from compressing the air that is supplied for combustion .