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Q1— Section header —
1.1
1.2A battery consists of six cells, each with an EMF f 2,1 volts , which are connected in series to an external resistance. T he terminal potential
1.2.1The value of the external resistance (3\
1.2.2The internal resistance of each cell (5\
1.2.3The power dissipated by the load resistance (3\
1.3Name, and explain THREE factors that determine the amount of induced voltage.
Q2— Section header —
2.1.1Explain the principle of mutual induction that is used in an ignition coil of the conventional ignition system. (3\
2.1.2Make a sketch to show the components. (2\
2.2Self induction in an unprotected circuit may damage the surface of contact breaker points. Make a neat sketch and with reference to the sketch explain
2.3With th e aid of a sketch show how self induction arises. (5\ [16]16
Q3— Section header —
3.1List SIX principal parts of the self starter of starting motors (6\
3.2The insulation of starter motor windings often burn, causing failure of the starter motor. Give THREE possible causes that may lead to this condition. (3
3.3Explain the function of the spiral splines on an armature shaft. (2 11040612
3.4A solenoid consists of a pull in coil and a hold in coil. The solenoid levers drive into the ring gear of an engine and connect the battery to the motor. Explain clearly the procedure to test the two coils of the solenoid, and indicate
3.5Explain the procedure to test the field coils of a starter motor for an earth fault (windings touching frames\ of the type where one end of the coil is riveted to the frame. (3\ [20]20
Q4— Section header —
4.1When starter is operated, its armature rotates until its piston is fractionally engaged, then stops. Give FOUR possible causes of this, and also the remedy for each. (4
4.2Explain what is meant by cranking speed (5\
4.3The rotating armature magneto which was widely used over a period of many years was later challenged and to a large extent replaced by other types.
Q5— Section header —
5.1A full wave rectifier converts AC to DC that is necessary for a battery charger to restore the charge of a battery. Draw a diagram of a full wave bridge rectifier that is connected to the following components:
5.2Explain the procedure that is used to quick charge a lead acid battery. (6\ 11040612
5.3The typical external characteristics A and of a shunt wound generator
Q6— Section header —
6.1Choose a n item or a description from COLUMN B that matches an item or a description in COLUMN A. Write only the letter (A \next to the question number
6.1.5\n the ANSWER BOOK. COLUMN COLUMN
6.1vice that provides switching without having moving parts The minimum conducting
6.2A transistor may be used as an amplifier. Name THREE types of transistor amplifiers. (3\ 11040612
6.3One of the battery faults is overcharging. Briefly explain the effects that overcharging has on a battery. [1 TOTAL: