waecE-LEARNING
Electronics Paper 2, May/June 2013  
Questions: 1 2 3 4 5, 6 &7 8 9 10 Main
General Comments
Weakness/Remedies
Strength
Question 10
  1.  List four types of transducers and their corresponding actuating signals.
  1.  State one application each for any two of the transducers listed in 10(a) above.

 

                 

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OBSERVATION

  The expected answers were:
                   (a)

Transducer

Actuating Signal

Tachogenerator
Piezoelectric crystal
Resistance strain guage
Thermocouple
Photo detector
Microphone

Speed
Mechanical vibration
Pressure
Heat(temperature)
Light (darkness)
Sound pressure



Transducer

Application

Tachogenerator
Piezoelectric crystal
Resistance strain guage
Thermocouple
Photo detector
Microphone

Speed control
Crystals; pick-up heads
Pressure measurement/control
Temperature measurement control
Remote sensing applications
Public address and similar applications


The question was on Control Circuits. The question was unpopular.
The performance of the very few candidates that attempted it was reportedly poor.

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