1/2
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER -III• EXAMINATION SUMMER 2017
Subject Code: 330205 Date: 08 05 2017
Subject Name: Automobile Electrical System
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make Suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of programmable Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
Q.1

Draw the symbols of following
1. Diode 2. Battery 3. Fuse 4. Horn 5. Transistor 6.Resistance 7.Heater
07






Explain ohm's law wiring harness color code used in vehicle wiring.
07



Q.2

Explain main components of battery.
07





State various tests on lead acid battery explain any one.
07



OR

State the seven important points of lead acid battery maintenance.
07



Q.3

Explain working principle of starter motor.
07





Explain advance retard mechanism use in distributor.
07



OR
Q.3

State the different types of starter motor drives and explain any one type.
07





Give difference between AC generator and DC generator.
07



Q.4

State the various parts of electronics ignition system explain their function.
07





Sketch explain working of cut out unit.
07
2/2



OR
Q.4

Draw the circuit diagram of starting circuit and charging circuit of automobile.
07





Explain adjusting of ignition timing.
07



Q.5

State the functions of following components.
The ignition coil ii) Contact breaker point iii) Condenser iv) Spark plug Ballast resistor vi) Timing mark on engine flywheel vii) Male female connector
07








Explain working principle of horn and horn relay.
07



OR
Q.5

Explain speedometer and odometer.
07





Explain fuel gauge and temperature gauge.
07