Question 5
- State two possible causes of current flow in the metal part of an appliance connected to a voltage source.
- List four electrical devices common to hydro- and gas electric power generating stations.
- State two types of protective devices that can be found in an installation
Observation
The expected answers were;
- (i) Poor earthing
(ii) Short circuit (leakage current)
- Electrical devices common to hydro and gas electric power generating stations
- circuit breakers
- exciter
- Switch gear
- Alternator
- Power transformer
- Control equipment
- Protective devices found in an installation:
- Fuse
- Circuit breaker
- Earthing
Many candidates who attempted this question did not do the question well.