Question 2
(a)(i) Define the term heat treatment of metals.
(ii) State one purpose each of the following heat treatment processes:
(I) annealing;
(II) hardening.
(b) State one function of the purifier used in low pressure welding system.
(c) Use the sketch in fig. 2 to answer question 1 (c)
.
(i) What is the reading on the gauge?
(ii) Name the part labelled X.
(iii) State one use of the gauge
Observation
The Candidates did well in this question. Some of them, however, could not satisfactorily answer the questions asked in 2 (c). The solution is as given below.
(c)
(i) The Reading on the Instrument
170 Bar
(ii) X: Inlet
(iii) Uses of the Shown Pressure Gauge
- It measures the volume of gas content in the cylinder.
- It measures the pressure of gas flowing out of the cylinder.