Radio,Television And Electronic Paper 2, May/June 2015

Question 4

    (i)         an active electronic component;
    (ii)        a passive electronic component.

    1. State three examples each of the active and passive electronic    
    2. components.

    3. Draw the circuit symbol for the following:
    4. (i)toggle switch; (ii)bipolar junction transistor.


The expected answers were:

  • (i) - An active component is one that introduces an internal controlled source in a circuit

(ii) -A passive component is one that does not introduce an internal controlled source in a

(b)    Examples of active electronic components
-           Transistors
-          Diodes
-           Integrated circuit  
-          Vacuum tubes {triode, tetrode, pentode}                 

 Examples of passive electronic components

  • Switches
  • Resistors
  • Inductors
  • Capacitors
  • Potentiometer
  • Diodes { vacuum/crystal}

(c) (i) Toggle switch

(ii) Bipolar junction transistor

Either PNP or NPN symbol   

The question was not well answered by candidates.