Session 5: Application and Replacement of Fuses
Module 5: Auto Electrical System
Textual Question-Answers
Check Your Progress
Fill in the blanks
1. The primary purpose of fuses is to protect electrical circuits fromthe detrimental effects of ………………….
Ans: overcurrent
2. Blade-type fuses are characterized by flat plastic units with……………male blade-type connectors.
Ans: two
3. Cartridge-type fuses, commonly used in older European vehicles,
have pointed ends and a metal strip that extends from…………….to……………..
Ans: one end to the other end
4. Fuse identification and specifications can usually be found on the…………..or the cover of the fuse box.
Ans: fuse box diagram
5. When replacing a fuse, it’s important to ensure that the new fusehas the correct …………..and………………Ans: amperage rating and type
Multiple Choice Questions
1. Fuses are used for protecting electrical circuits and equipmentagainst the effects of:
A) Voltage spikes
B) Excessive currents
C) Magnetic fields
D) Static electricity
Ans: B) Excessive currents
2. In the case of a greater number of fuses, each fuse might protect:
A) A single electrical item
B) A specific type of circuit
C) A group of electrical items
D) All lighting circuits
Ans: C) A group of electrical items
3. Which fuse is commonly used to protect circuits controlled by theignition switch?
A) 15 A
B) 25 A
C) 35 A
D) 50 A
Ans: A) 15 A
4. The three basic types of fuses include glass or ceramic fuses,
blade-type fuses, and:
A) Bullet or cartridge fuses
B) Wire fuses
C) Fibre fuses
D) Magnetic fuses
Ans: A) Bullet or cartridge fuses
Answer the following questions
1. Discuss the importance of applications and the replacement offuses in a vehicle.
Ans: Fuses are important safety devices used to protect vehicle electrical
circuits from damage due to excessive current. They prevent wiring damage,
fire hazards, and failure of electrical components. Correct application of fusesensures proper protection of circuits. Timely replacement of blown fuses withcorrect rating and type helps restore circuit operation and prevents repeatedfailures.
2. Name different types of fuses and explain.
Ans: Different types of fuses used in automobiles are:
Glass or ceramic fuses, which contain a fuse element enclosed in a glassor ceramic tube and are used in older vehicles.
Blade-type fuses, which are flat plastic fuses with metal blades and arecommonly used in modern vehicles.
Cartridge or bullet fuses, which have metal ends and are mainly used inolder European vehicles.
3. Write the values of fuses used in the different electrical systemsof an automobile.
Ans: Common fuse values used in automobiles are 5 A, 10 A, 15 A, 20 A,
25 A, 30 A, and 40 A, depending on the electrical load of systems such aslighting, ignition, accessories, and power circuits.
4. Explain the colour coding of different fuses.
Ans: Colour coding of fuses helps in easy identification of their current
rating. Each fuse colour represents a specific amperage value, such as red for10 A, blue for 15 A, yellow for 20 A, green for 30 A, and clear or white forlower ratings. This helps technicians quickly select the correct fuse.
Activity
1. Make a list of equipment used in an automobile which uses fusesfor their protection and also write the value of fuse.
Ans:
1. Name of the equipment: Headlamp circuit
Value of the fuse in amperes: 15 A
2. Name of the equipment: Horn circuit
Value of the fuse in amperes: 10 A
3. Name of the equipment: Wiper motor
Value of the fuse in amperes: 20 A
4. Name of the equipment: Audio system
Value of the fuse in amperes: 15 A
2. Prepare a poster showing three types of fuses used in theautomobile electrical system and write their names also.
Ans: The poster should show blade-type fuse, glass fuse, and cartridgefuse with their names clearly labeled and brief identification for use inautomobile electrical systems.
