Basic Electricity 2, WASSCE (SC), 2017

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;

  1. (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.