waecE-LEARNING
Applied Electricity Paper 2 , May/June 2012  
Questions:   1 2 3 4 5 6   Main
General Comments
Weakness/Remedies
Strength








Question 5
  1. The expected answers were:

    (a)  (i) Iron loss test                                                                   
          (ii) Copper loss test                                                                        
    (b)  (i) Efficiency (in )       =                                                  
                                      0.95   =                                                      
      Total power loss     =       5(1 – 0.95) = 0.25kW                                             
      (ii) Output power         =       Input power – Total power loss                      
                                        =       5 kW – 0.25 kW                                           
                                      =       4.75 kW                                                                

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Observation

The question was on A.C. machines. The question was well attempted by the candidates and they put up a good performance.

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