Session 1: Automotive Electrical and Electronics Symbol
Module 5: Auto Electrical System
Textual Question-Answers
Check Your Progress
Fill in the blanks
1. The symbol for an electrical wire represents the …………..
Ans: conductor.
2. Resistor reduces the flow of ……………. in an electrical circuit.
Ans: current.
3. Neoprene rubber is often used as insulation for cables due to itsresistance to ………… oil, and heat.
Ans: water.
4. High-tension (HT) cables are used to connect the …………… tothe spark plugs.
Ans: ignition coil.
5. The purpose of a wiring harness is to simplify connections andprevent damage from ……….. objects.
Ans: external.
Multiple Choice Questions
1. What is the purpose of using automotive electrical symbols?a) To confuse mechanics
b) To simplify circuit diagrams
c) To increase voltage
d) To generate light
Ans: b) To simplify circuit diagrams
2. Which type of switch disconnects the current when open?
a) SPST Toggle Switch
b) Pushbutton Switch (N.O)
c) SPDT Relay
d) Jumper
Ans: a) SPST Toggle Switch
3. What does a resistor do in an electrical circuit?
a) Increases voltage
b) Reduces current flow
c) Acts as a switch
d) Generates light
Ans: b) Reduces current flow
4. Which cable is used for the battery circuit?
a) Black
b) Green
c) Yellow
d) Brown
Ans: a) Black
5. What is the primary purpose of a wiring harness in automobiles?a) To confuse mechanics
b) To increase voltage
c) To simplify connections
d) To generate heat
Ans: c) To simplify connections
6. Which cable is used for the headlamp circuits?
a) White
b) Blue
c) Red
d) Black
Ans: b) Blue
Answer the following questions
1. Draw a neat diagram of following items in symbolic form.
a. Fuse
Ans: Fuse is represented by a straight line with a small rectangle or breakin the middle.
b. Relay
Ans: Relay is shown by a coil symbol connected to switch contacts.
c. Transistor
Ans: Transistor is represented by three terminals: emitter, base, andcollector with an arrow.
d. LED
Ans: LED is shown as a diode symbol with two arrows pointing outward.
e. Ground
Ans: Ground is represented by three horizontal lines of decreasing length.
Draw the diagram yourself.
2. Write various specifications of automobile cables.
Ans: Automobile cables are specified by conductor material, crosssectional area, voltage rating, insulation type, temperature resistance, andflexibility.
3. What do you understand by cable color codes? Classify theautomobile cables.
Ans: Cable color codes are standardized colors used to identify thefunction of electrical circuits. Automobile cables are classified as batterycables, ignition cables, lighting cables, charging system cables, and accessorycircuit cables.
4. What is wiring harness? How does it affect the electrical connections in automobile?
Ans: A wiring harness is a bundle of electrical wires arrangedsystematically to transmit power and signals. It improves safety, reliability, ease of maintenance, and protects wires from heat, vibration, and mechanical damage.
Activity
1. Make a list of the auto electrical components and also write briefdescription
Ans:
S. No. Component Description
1. Battery Stores and supplies electrical energy
2. Alternator Charges the battery and supplies power
3. Starter motor Cranks the engine for starting
4. Fuse Protects circuit from overload
5. Relay Controls high current using low current
2. Prepare a poster showing symbols of auto electrical and electroniccomponents and write also their names.
Ans: The poster should include symbols and names of battery, fuse, relay, switch, resistor, diode, LED, transistor, ground, and motor. Try yourself.
