Physics
An alloy of lead and tin is used as the material of the fuse wire because its melting point is …………… and specific resistance is …………… ,
- high, high
- low, high
- low, low
- high, low
Answer
low, high
Reason — An alloy of lead and tin is used as the material of the fuse wire because its melting point is low, so that it may easily melt due to overheating when current in excess to the prescribed limit passes through it and specific resistance is high so that sufficient heat is required to melt it.
Related Questions
A fuse wire permits the flow of current through it only up to a certain limit which is called :
- charge rating
- charge limit
- current rating
- none of the above
The rise in temperature of fuse wire depends upon :
- current rating
- radius r
- length of wire
- both (1) and (2)
The full form of MCB is :
- miniature current breaker
- miniature current board
- miniature circuit breaker
- miniature circuit board
The rating of a fuse connected in the lighting circuit is:
- 15 A
- 5 A
- 10 A
- zero