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Metal Works Paper 2, May/June 2009  
Questions: 1 2 3 4 5 Main
General Comments
Strength
Weakness/Remedies














Question 3

1(a) What is casting?

(b) State in sequen3.

2(a) Explain the term plating in metal finishes.

(b) (i)  With the aid of a sketch, explain the process of electroplating a copper rod with zinc.
ii) Label any four parts of the sketch in (b)(i).

(c)        State the three processes involved in cleaning the components to be plated.

In (a and b) most of the candidates had no difficulty in giving the required responses to these parts of the question.

tial order, five steps involved in casting an object.

(c) With the aid of a sketch, show a core print in use.

_____________________________________________________________________________________________________
OBSERVATION

(c)        This part of the question seemed to be very difficult for most of the candidates.  The right responses expected from the candidates are:
            -           chemical cleaning;
            -           polishing the component, and
            -           degreasing.

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