Engineering - Exam Papers - OL - Paper - 2001
200 Marks
Answer Question 1, Sections A and B and THREE other questions.
Section A - 30 Marks
Give brief answers to any six of the following :
| (a) |
Name a plastic material suitable
for wall insulation. |
| (b) |
Explain the abreviations A.C. and
D.C. in relation to an electricity supply source. |
| (c) |
Name two non - ferrous metals. |
| (d) |
Name the two screw threads shown. |
|
| (e) |
Name two safety precautions to be
observed when using an electric arc welder. |
| (f) |
What is haematite ? |
| (g) |
Name the ores from which copper and
aluminium are produced. |
| (h) |
Identify the two types of force
shown. |
|
Section B - 35 Marks
Answer any three of the following :
| (i) |
Describe the function and operation
of any one of the following :
Bicycle dynamo; Electric soldering iron; Plotter. |
| (j) |
Explain any two of
the computing terms :
byte; downloading; icon; input device. |
| (k) |
Define elasticity in relation to
the properties of metals. |
| (l) |
Explain any two of
the terms :
Polymer; Insulator; Computer Numerical Control
(CNC). |
| (m) |
Name the mechanism shown and
explain the type of motion it produces. |
|
| (a) |
Explain what is meant by the term
"work hardening". How can the
condition be treated ? |
| (b) |
Explain why low carbon steel may
be case hardened, rather than hardened. |
| (c) |
What does normalising mean ? |
| (d) |
Compare the process of hot
rolling and cold rolling of metals, listing the
advantages and disadvantages of each. |
| (a) |
Name three modern
methods used for the production of steel, and
describe one method with the aid
of a labelled diagram. |
| (b) |
What is an alloy ? |
| (c) |
Name the materials used and the
reason for the choice in the manufacture of the
following : |
| (i) |
Lathe Bed |
| (ii) |
Centre Punch |
| (iii) |
Motor Cycle Windshield |
| (d) |
Name the ores from which tin and
lead are produced. |
| (a) |
What two gases are most commonly
mixed to give a flame hot enough for welding ? |
| (b) |
Explain the difference between a
passive and an active flux in the soldering
process. |
| (c) |
Explain the basic difference
between gas welding and manual arc welding. |
| (d) |
Explain the function of fluxed
electrodes in manual arc welding. |
OR |
| (d) |
Name the two electrical components
shown. |
|
| (a) |
What are the main differences
between thermoplastic and thermosetting
plastics. |
| (b) |
Describe one of the
following processes used to form plastics : |
| (i) |
Vacuum Forming |
| (ii) |
Blow Moulding |
| (iii) |
Compression Moulding |
| (c) |
Name three safety
precautions to be observed when using a Plastics
Dip Coating Tank. |
| (d) |
Name the plastic used in the
manufacture of the two components shown : |
|
| (a) |
Name the lathe turning operations
shown. |
|
| (b) |
Describe one of the
following work holding methods used in
machining, and state the type of work machined. |
| (i) |
Between Centres |
| (ii) |
Mandrel |
| (iii) |
Independent Jaw Chuck |
| (c) |
Sketch a lathe cutting tool,
showing the following angles : |
| (i) |
Top Rake |
| (ii) |
Front Clearance |
| (iii) |
Side Clearance |
OR |
| (c) |
Name three advantages of a CNC lathe over a conventional
lathe. |
| (a) |
Explain |
| (i) |
Interference Fit; |
| (ii) |
Clearance
Fit; |
| (iii) |
Transition Fit. |
| (b) |
A shaft is to be made 80 ± 0.05.
Determine : |
| (i) |
The maximum diameter of the
shaft. |
| (ii) |
The minimum diameter of the
shaft. |
| (iii) |
The tolerance on the shaft. |
| (c) |
Explain, with the aid of
sketches, the following thread terms : |
| (i) |
Pitch |
| (ii) |
Crest |
| (iii) |
Root. |
OR |
| (c) |
Explain clearly the purpose
of any three of the
following : |
| (i) |
Diode |
| (ii) |
Solar Cell |
| (iii) |
Reamer |
| (iv) |
Centre Drill |
