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Auto Mechanics Paper 2,Nov/Dec 2009.  
Questions:   1 2 3 4 5   Main
General Comments
Weakness/Remedies
Strength
























Question 2

Question 2

  1.  (i)  Sketch the layout of the fuel supply system for a diesel engine having the in-line

       injection pump.

(ii)  Label any one part.

  1.  State four differences between the spark-ignition and compression-ignition engines.
  2.  State one function of an injection pump.

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OBSERVATION

Most of the candidates could not sketch the layout of the fuel supply system for a diesel engine having the in-line injection pump.  The correct sketch is given below.

Part (c) of the question also posed a serious problem to the candidates as most of them stated the function of an injector.  The required response ought to be: 

The injection pump builds up a pressure high enough to force fuel out in a finely atomized spray into the combustion chamber.

 

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