13 Questions
What is the main difference between current-limiting and non-current-limiting fuses?
Current-limiting fuses introduce resistance into the circuit, causing the current to stop rising and force quickly to zero.
What is the purpose of a fuse?
To break a circuit when current exceeds a given value for a sufficient time
What happens to the current in a circuit when a non-current-limiting fuse melts?
The current continues to virtually the same peak as would occur if the fuse had not melted
What are the two main components of a fuse?
Fuse link and fuse holder
What is the purpose of a current-limiting fuse?
To limit the current in magnitude as well as duration.
What are the two types of fuses?
Low-voltage and high-voltage fuses
Which type of low-voltage fuse includes semi-enclosed rewirable fuses and high rupturing capacity cartridge fuses?
Low-voltage fuses
What are the three types of high-voltage fuses?
Explosion, drop-out, and liquid-quenched fuses
What are the characteristics of the material used for fuse elements?
Low melting point, high conductivity, no oxidation, and low cost
What is a satisfactory material for fuse wires?
Silver
What are the various characteristics of fuses?
Rated current, minimum fusing current, fusing factor, prospective current, cut-off current, pre-arcing time, arcing time, total operating time, and rupturing capacity
What is the formula for the heat generated by a fuse?
I2R
Is a fuse required to pass an actual current equivalent to its rupturing or breaking capacity?
No
Study Notes
- A fuse is a device that breaks a circuit when current exceeds a given value for a sufficient time.
- The fuse consists of a fuse holder and a fuse link.
- Fuses may be classified into low-voltage and high-voltage fuses.
- Low-voltage fuses include semi-enclosed rewirable fuses and high rupturing capacity cartridge fuses.
- High-voltage fuses include expulsion, drop-out, and liquid-quenched fuses.
- The material used for fuse elements should have low melting point, high conductivity, no oxidation, and low cost.
- Silver is a satisfactory material for fuse wires.
- Fuses have various characteristics such as rated current, minimum fusing current, fusing factor, prospective current, cut-off current, pre-arcing time, arcing time, total operating time, and rupturing capacity.
- The heat generated by a fuse is proportional to I2Rt.
- A fuse is never required to pass an actual current equivalent to its rupturing or breaking capacity.
Test your knowledge about fuses with this informative quiz! Learn about the different types of fuses, their classifications, and the materials used to make them. Explore the various characteristics of fuses and how they relate to their performance. See if you can answer questions about fuse heat generation and the importance of fusing current. Challenge yourself and become a fuse expert with this quiz!
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