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Metal Works Paper 3, Nov/Dec. 2013  
Questions: 1 2 3 4 5 Main
General Comments
Strength
Weakness/Remedies









Question 3

 

            (3)       (a)       Sketch a blacksmith forge and label the following parts:

  1. hood;
  2. tuyère;
  3. chimney.

 

(b)       Explain why quenching in heat treatment is done in the following ways:

  1. vertically;
  2. stirring.

 

(c)        state two characteristics of a case hardened spanner.

_____________________________________________________________________________________________________
OBSERVATION

This question attracted most of the candidates.  The parts that seems difficult for them were parts (b) and (c).  The required responses to these parts are:

(b)       (i)         To prevent cracking and minimize distortion.
(ii)        To keep the quenchant at uniform temperature and to promote rapid cooling.

                        (c)        -           Hardness
                                    -           Toughness.

 

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