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Standard VII
Physics
Miniature Circuit Breaker
Question

Which of the following is the function of MCB in household circuit?
  1. This switch automatically turns off when current exceeds safe limit
  2. This switch automatically turns on when current exceeds safe limit
  3. Saves the electrical appliances from getting damaged due to excess current
  4. Saves from short-circuiting

A
This switch automatically turns off when current exceeds safe limit
B
This switch automatically turns on when current exceeds safe limit
C
Saves the electrical appliances from getting damaged due to excess current
D
Saves from short-circuiting
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Solution
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An MCB functions by breaking the flow of electric current through the circuit once a fault is detected. In simple terms, MCB is a switch which automatically turns off when the current flowing through it passes the maximum allowable limit.
A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit. Its basic function is to interrupt current flow after a fault is detected.

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MCB automatically switches off the electrical circuit in an overload condition.


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What name is given to the device which automatically cuts off the electricity supply during short-circuiting in household wiring ?

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Question 2

Choose the statement which is not correct in the case of an electric fuse.

(a) Fuses are inserted in electric circuits of all buildings

(b) There is a maximum limit on the current which can safely flow through the electric circuits

(c) There is a minimum limit on the current which can safely flow in the electric circuits

(d) If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit

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