Electronics Paper 2, May/June 2013  
Questions: 1 2 3 4 5, 6 &7 8 9 10 Main
General Comments

Question 2

In Figure 4, a 5 V stabilized power supply is required from a 12 V d.c. input source. If the maximum power rating of the zener diode is 2 W, calculate the:

  1. maximum current flowing in the zener diode;
  2. load current, IL;
  3. value of the series resistor, RS.



  The expected answers were:

  1.  Maximum current flowing in the Zener diode is given by

The question was on Power Supply. The question was very unpopular with the candidates.  The performance was poor.


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