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Auto Mechanics Paper 2,Nov/Dec 2008.  
Questions:   1 2 3 4 5   Main
General Comments
Weakness/Remedies
Strength










































































Question 2

(a)        State three functions of a poppet valve.
                       
(b)        (i)         Sketch a poppet valve.
            (ii)        Label three parts.

(c)        Name three parts of a wheel


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OBSERVATION

This question posed a big problem to the candidates as they could not give
the required responses to the various parts of the question.  The required responses are:

(a)     functions of a poppet  valve include:

           - make a gas-tight seal with its ports when closed;
           - offer no opposition of charge into the cylinder when opened;
           - operate with minimum friction;
           - operate with simple mechanism, and
           - open to allow the escape of burnt gases.

(b)     The correct sketch of a poppet valve is given below.

(c)     Three parts of a wheel are the

        tyre;
        rim and
        tube.


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