Question 2
-
(a) (i) State the function of a starting system in the operation of a motor vehicle.
(ii) List two parts of a starter motor.
(b) Table 2 contains some component parts of the starting system.
Complete the table by sketching the circuit symbol of the listed component parts and naming two other parts to which each is directly connected to.
Table 2
S/NComponent part
Circuit symbol
Other parts directly connected to
(i)
Starter motor
(ii)
Starter solenoid
(iii)
Starter relay
(c) State two symptoms of fault in a motor vehicle that are traceable to the starting system.
Observation
- (i) Function of the starting system in the operation of a motor vehicle
- to crank the engine
- to start the motor vehicle engine
(ii) Parts of a starter motor
- armature
- brushes
- commutator
- solenoid switch
- overrunning clutch
- field coil
- pinion gear
- fork/lever
- Bush bearing/ plain bearing
- Front end bracket
- Rear end bracket
- Brush end plate
- Brush spring
- Pele shoe
- Plunger
- Feed terminal
- Bendix
- Table 2
S/N |
Component part |
Circuit symbol |
Other parts directly connected to |
(i) |
Starter motor |
|
Battery ignition switch |
Ignition switch |
|||
(ii) |
Starter solenoid |
|
Battery |
starter motor |
|||
(iii) |
Starter relay |
|
Ignition switch |
solenoid/starter motor |
- Symptoms of fault in a motor vehicle that are traceable to the starting system
- Slow cranking
- Noisy operation
- Failure to crank
- Smoke coming from under the hood (bonnet) due to started working
- Starter motor fails to stop when ignition key is released as engine is running
As reported by the Chief Examiner, candidates’ responses in part (a) were good and average while in part (b) and (c) the performance fell below average.