Observation

This question did not pose any difficulty to the candidates. The expected responses are as given below:

2 (a)         

(i)      The name of the tool sketched is a venier caliper

(ii)     The parts labelled are:

W  -  fixed jaw
X  -   sliding jaw/moveable jaw
Y  -   fine adjustment screw
Z  -    rule/main scale 

(iii)    Stating two uses of the tool:

-  for taking internal measurement;
-  for taking external measurement.      

(b)        Stating one advantage of brazing over soft soldering

(i)    Dissimilar materials can be joined by brazing;
(ii)   Brazing provides a stronger joint;
(iii)  Brazing is used for joining thicker materials.

(c)        Listing three heat treatment processes used for tools

-  Hardening            
-  Normalizing
-  Annealing         
-  Case hardening
-  Tempering