Important Questions of Fuses:

1. What is a fuse ? Discuss the advantages and disadvantages of a fuse.

2. Why do we prefer silver as a fuse element ?

3. Define and explain the following terms

(i) fusing current (ii) cut off current (iii) operating time (iv) breaking capacity

4. Write short notes on the following :

(i) Semi-enclosed rewireable fuse

(ii) H.R.C. cartridge fuse

(iii) Difference between a fuse and circuit breaker

5. Why are circuit breakers preferred to fuses ?

6. Why fuses cannot provide adequate discrimination on heavy short-circuit ?

7. Why fuses can interrupt heavy short-circuit currents successfully ?