1. The main function of a fuse is to
(A) Protect the line(B) Open the circuit
(C) Prevent excessive currents
(D) None of the above
Ans: (C) Prevent excessive currents
Explanation:
2. The arcing contacts in a circuit breaker are made
(A) Copper tungsten alloy
(B) Porcelain
(C) Electrolytic copper
(D) Aluminum alloy
Ans: (A) Copper tungsten alloy
Explanation:
The main contacts are made of copper-cadmium alloys. The arcing contacts are made up of heat-resistant material like copper tungsten, or silver tungsten.
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