Observation

Majority of the candidates that answered the questions performed very well.

In part (a), performance was above average. However, many candidates did not recognize timer, thermostat and warmer as important parts.

In part (b), performance was good. Most of the candidates who attempted this question got the right response.

In part (c), performance was below average. Most candidates performed poorly in this part. Few candidates got the right response.

In part (d), performance was below average. Some candidates performed well. The question required that each loop be controlled independently in looping form. Candidates failed to recognize that the wiring is not radial.

The expected answers include:

3 (ai)    Three Parts of an Electric cooker

• Boiling plate element
• Grill plate 
• Oven 
• Rotary switch
• Thermostat
• Timer
• Indicating lamp
• Centrifugal switch
• warmer

(ii)       Two Types of Boiling Plate Found in an Electric Cooker

• Solid hot plate
• Radiant plate/ring

(b)       Instrument used for Measuring Quantities
(i)   -     Ammeter
(ii)  -     Voltmeter
(iii)  -    Micrometer screw gauge
(iv)  -    Ohmmeter

(ci)      Four Parts of Steel Wire Armoured Cable

• Conductor
• Insulator
• Bedding
• Oil Impregnated paper
• Armour
• Sheath

(ii)       Three Characteristics of an MICC cable

• Higher current density
• Hygroscopic
• Ability to withstand high temperature
• Aesthetic
• Higher fire resistance
• High resistance to heat
• High resistance to ionizing radiation
• Does not deteriorate with age

(d)       Wiring Diagram of Three Points of Light, Each Controlled by Three 1-Way Switches

(e)       Four Tools Used in Conduit Installation

• Bending block
• Bending machine
• Reamer
• File
• Pipe vice
• Stock and die
• Hacksaw
• Fishing tape
• Bending spring
• Spanner
• Hammer Chisel.