Question 1
- (i) Explain the term ‘hazard’ in Radio, Television and Electronic Works (RTV)
workshop
(ii) State four ways of preventing electric shock in a RTV workshop.
- A student discovered a mistake after soldering a component into a circuit board. In other to make the circuit work, he needs to remove the component and fix it appropriately.
State :
- the name of the process of removing the component from the circuit board;
- three tools required for 1(b)(i);
- one property of a solder.
- List three fault finding equipment in a RTV workshop.
Observation
The expected answers were:
- (i) Hazard is a situation/event in the workshop that exposes one to risks (or may harm
people) or damage equipment.
(ii) Ways of preventing electric shock in the workshop
- Always keep the floor dry
- Ensure circuits are well grounded/earthed.
- Avoid horseplay.
- Wear protective equipment.
- Avoid keeping wires naked.
- Use tools with appropriate insulation.
- Avoid working on live circuits.
- Discharge high voltage capacitors.
(b) (i) De-soldering
(ii) Tools required for (b)(i)
- Lead sucker
- De-soldering wick
- Soldering iron
- Long nose pliers
- Soldering iron support/stand
- Brush
- Emery cloth/smooth file
- Flat-head screw driver
(iii)Properties of solder
- Lower melting point compared to the work piece
- Non-emission of poisonous gas
- Resistance to corrosion
- Easy to set
- It is flexible
(c) Fault finding equipment in a Radio, TV and Electronic Works (RTV) workshop
- Television analyzer
- Signal tracer
- Oscilloscope
- Logic probe
- Neon tester
- Digital frequency counter
- Multimeter
- Transistor tester
- Avometer
- Audio tester