cameroon gce A level 2020 electrical and electronic system 1

cameroon gce A level 2020 electrical and electronic system 1

cameroon gce A level 2020 electrical and electronic system 1

1. What happens when a magnetic field moves across a conductor, or when a conductor is moved through a magnetic field?
A Flux is created
B Current is induced in the conductor
C Spark is produced
D The conductor is deflected
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2. Colour coded cables are used in vehicle circuits
and wirings in other to
A enable a variety of cable colours in use
B increase cable life
C identify particular cables during fault finding
D prevent the use of only one type of cable
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3. A relay is a
A Remote controlled switch
B Magnetic resistor
C Non-magnetic capacitor
D Heating device
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4. The charging method indicated below is

Figure 1
A Constant current.
B Constant Voltage.
C Varying current.
D Varying resistance.
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5. The internal resistance of a battery
A decreases with age.
B increases as the relative density decreases.
C restrict capacity.
D should be as high as possible.
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6. The sedimentation trap in the lead-acid battery prevents
A open circuits of plates.
B short circuit between the cells.
C short circuit between the cells plates.
D open circuit between the cells plates
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7. Two methods in which EMF is induced without
movement of parts are by
A mutual and magnetic induction.
B self and magnetic induction.
C magnetic and cross induction.
D self and mutual induction
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8. The thermistor mounted on the evaporator fins of the A/C
circuit has as function to;
A Sense the pressure of the air passing through the fins.
B Sense the volume of the gas passing through the fins.
C Sense the temperature of the air passing through the evaporator.
D Sense the pressure of the gas passing through the evaporator.

9. The schematic partial view of the blower motor in Figure 3
below works only with the blower switch in the number 4
position. This could be caused by a failed

Fig.3
A Blower motor.
B Blower motor ground.
C Blower motor heat control panel.
D Blower motor resistor.
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10. They relay shown in figure below is

Fig. 4
A A photo coupled solid state relay.
B Electrolytic solid state relay.
C Transistorized electronic relay.
D Transistorized solid state relay
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11. The core of transformer coil is constructed from
laminations so as to;
A Increase eddy current
B Reduce power losses
C Reduce the purchasing power
D Increase the number of turns
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12. With the ignition switch on, a hall effect pulse generator in an ignition distributor will produce an output voltage when the
A engine is running
B engine is cranking
C hall chip is shielded
D hall chip is not shielded
_______________________________________________
13. The core of transformer coil is constructed from laminations so as to
A increase eddy current

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