Basic Electronics Paper 2, WASSCE (SC), 2016

Question 1

    1. Define the term voltage regulation.
    2. List five sources of power supply.
    3. State three advantages of full-wave bridge rectifier over center-tap rectifier.

 

Observation

                                                                                                                                   

  • Copy the diagram and indicate the direction of current flow during the

positive half cycle.   

  •  State three advantages of a full-wave bridge rectifier.

           
The expected answers were:
(a)       Voltage regulation:
A measure of the degree to which a power source maintains its output voltage stability under varying load conditions.
OR
A change in supply’s terminal from no-load to full load.                                                        

(b)       -  a.c. generators
-  d.c. generators
-  Solar cells
-  Power packs
-  Accumulators
- Hydro
- Nuclear
- Wind

(c)       Three Advantages of full-wave over centre-tapped rectifier
-  The need for a centre-tapped transformer is eliminated
-  Less expensive
-  The PIV rating of the diode is one-half times that of the centre-tapped
circuit for the same d.c. supply.  

  • It is smaller in size.
  • Output is doubled.

Rather than defining Voltage regulation, many candidates described.