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

Question 2

  1. List the two types of feedback in electronic circuits.
  2. State one application each for the feedback listed in 2(a).
  3. Draw and label a stabilized low d.c power supply unit.


The expected answers were:
(a)  Two types of feedback

  • Positive feedback                                                                                           
  • Negative feedback                                                                                         

(b) Applications of positive feedback
-  Oscillators
- Multivibrators    

Applications of negative feedback

  • Amplifiers                                                                                                                  

(c). stabilized low d.c power supply
   Alternative I

Alternative II

   The question was on Electronic Devices and Circuits. It was unpopular with candidates not generally answered.