Basic Electricity 2, WASSCE (PC 2ND), 2019

Question 6

 

  1. Define the following terms
    1. Corrective maintenance;
    2. Preventive maintenance.
  2.  

  3. When the metal part of an energized electric iron is touched with a test lamp, the lamp comes on. State the:
    1. Possible cause of this fault;
    2. Corrective action to be taken.

Observation

The expected responses were:

 

  1.     Definition of terms
    1. Corrective maintenance is a form of maintenance carried out on a faulty/damaged machine/equipment to restore back to working condition
    2. Preventive maintenance is a form of maintenance carried out periodically according to the producer/manufacturer manual to keep the machine/equipment in good working condition.
  2.  

    1. Short circuit
    2. Corrective action to be taken
      • Check and tighten loosed terminals
      • Check and clean corroded terminals
      • Check and replace exposed wire touching metal parts

 

Many candidates who attempted this question did the definitions well but did not do the second part well.