Question

1. a fast blow fuse is used when _. a a momentary flow to excessive current will not damage a circuit b an interruption to excessive voltage is needed c an instantaneous interruption to excessive current flow is needed d a quick repair to a ground fault is needed

Explanation:

A fast - blow fuse is designed to quickly interrupt the circuit when excessive current flows. It acts instantaneously to protect the circuit from damage caused by over - current. It is not related to voltage interruptions (option b) or ground - fault repair (option d). And it's not for cases where momentary over - current won't damage the circuit (option a).

Answer:

C. an instantaneous interruption to excessive current flow is needed