Basic Electricity Paper 2 , May/June 2014  
Questions:   1 2 3 4 5 6 7   Main
General Comments

Question 5
  1. Sketch the load characteristics of a:

(i)         shunt generator;
(ii)        series generator.

  1. A shunt generator of field resistance of 45 Ω supplies 90 A at 230 V.

(i)         Draw the circuit diagram.
(ii)        Calculate the field current.


The expected answers were:

                             (ii) Field current, If =                                                         
                                    If  =                                                                                                                                 


If = 5.11 A                                                     

The question was on Electrical Machines. The question was well attempted by the candidates. Many candidates who attempted this question could not sketch the load characteristics correctly, however, few of the those who attempted it got the circuit diagram and the value of the field  current correct.

Powered by Sidmach Technologies(Nigeria) Limited .
Copyright © 2015 The West African Examinations Council. All rights reserved.