Auto Mechanics Paper 2,May/June 2012  
Questions:   1 2 3 4 5   Main
General Comments

Question 2

    • Use sketches to illustrate the operations of the 4-stroke, cycle diesel engine.
    • Describe the operation of the power stroke.
    • What ignites the fuel in a compression ignition engine?


Most of the candidates attempted this question with good performance.
However, some of the candidates could not answer parts (c) and (d) correctly.
The correct answers to parts (c) and (d) are:

  1. Pre-ignition does not occur in the compression ignition engine because  only

air is compressed which is not ignitable.

    • It is compressed air.


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