Fuses Question Bank with Answers:
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1. What is meant by a fuse? What are the advantages of fuses? Name some of the commonly used materials as fuse element. Why silver is preferred as fuse element inspite of its higher cost ?
2. Explain the difference between fusing current and current carrying capacity of a fuse.
3. Name some important materials for fuse elements. Describe the essential requirements of a fuse material.
4. Discuss the different types of fuses in brief as used in electrical circuits.
5. Distinguish between fuse and circuit breaker. Discuss the advantages and disadvantages of a fuse. What are the desirable characteristics of fuse elements ? Why do we prefer silver as a fuse element ?
6. What are the different types of fuses? Discuss with a neat sketch the construction and working principle of a HRC fuse. State the advantages and disadvantages of it over other types of fuses.
7. Silver, inspite of its high cost is used as a fuse element in a HRC fuse, explain why ? What are the purposes of using quartz and as filler material in the construction of HRC fuse ?
8. What is a HRC fuse ? Explain its construction and operation. Also mention its applications.
9. Descnbe the construction and operation of a HRC cartridge fuse. What are its advantages and disadvantages ?
10. Explain the following terms in connection with a fuse: (i) rated current. (ii) fusing factor.
11. What do you mean by discrimination ? Discuss discrimination between a fuse and an overcurrent relay.
12. With a neat sketch explain the principle of operation of a HRC fuse. Name at least two application areas of such a fuse. Is there any better type of fuse as compared to HRC fuses available in the market ? What is drop-out fuse ?
13. Explain in brief the princip of working of low voltage HRC cartridge fuse. How can this fuse ease the duty on circuit breakers ?
14. Describe the construction and operation of the HRC cartridge fuse. What are its advantages and disadvantages ? What are considerations in selecting a fuse for (i) transformer protection (it) motor protection (iii) capacitor protection (iv) heaters (v) lighting loads ?
15. What do you mean by discrimination ? Discuss discrimination between (i) two fuses; (ii) a fuse and an overcurrent relay.
16. In relation to a fuse, explain what do you mean by (i) prospective current (ii) cut-off current and (iii) time-delay fuse. Give the advantages of HRC fuses.
17. Describe the HRC fuse with a tripping device with a neat sketch. State its advantages over an HRC fuse without tripping device.
18. Write short notes on the following :
- Time-current characteristic of a fuse.
- Fuse element materials.
- HRC fuses.
- HRC fuse with tripping device.
- High voltage fuse.
- Short-circuit protection using HRC fuses.