Question 3
(a) State three differences between analogue and digital multimeters
(b) List four electronic hand tools used in the Radio, Television and Electronic Works workshop.
(c) State:
(i) two applications of an ohmmeter;
(ii) three applications of a Cathode Ray Oscilloscope.
The expected answers were:
(a)
Analogue multimeter |
Digital multimeter |
It is rugged |
It is fragile |
It is less accurate |
It is accurate |
It has pointer on a scale |
It has screen to display |
It is cheap |
It is costly |
It is affected by magnetic field |
It is not affected by magnetic field |
It may need battery |
It needs battery always |
It applies mechanical moving parts |
It uses only electronic components and devices |
(b) Any four electronic hand tools
- Screw driver
- Soldering gun
- Pocket knife
- Stripper
- Solder sucker
- Pliers
- Cutters
- Hammers
(c)(i) Two applications of an ohmmeter
It is used for testing semiconductor
It is used for measuring resistance
It is used for checking continuity
(ii) Three applications of a Cathode Ray Oscilloscope
Current measurement
Voltage measurement
Frequency/Time measurement
Waveform display
Phase difference measurement
The question was on Electronics tools and Instruments. It was unpopular with the candidates. The candidates’ performance was reported to be average |
