Question

MCB stands for:
(a). Main circuit board
(b). Master code bill
(c). Miniature circuit breaker
(d). None of these

Answer 1

- Hint: One should have some knowledge regarding electrical circuits and wirings which are very much used in our daily life. Here, as we can see the option it is related to some circuit can be identified also it detects the excess current flow and immediately turns the switch down to prevent it from short-circuit.

Complete step-by-step solution -
Now, MCB stands for Miniature circuit breaker which is an automatically electronic switch which detects the access current flow in any of the device and immediately turns the switch down to cut the power supply of the particular device to prevent it from burning. The MCB is an electromechanical device which prevents electrical wiring, application etcetera to prevent any kind of damage from excess current flow and fire.
In ancient times, fuses were used which needed to be replaced after a short circuit. But now this electronic switch is just needed to restart and it will start functioning. It is very easy and safe to use.
When the current exceeds its defined limit, the MCB breaks the circuit and prevents harm. After this, break down we manually need to restart the switch in order to run that device. It is reusable and is cheaper in cost than fuse. It is very sensitive in case of current flowing in devices.
Sometimes, in case of overheating, MCB takes 2 seconds to 2 minutes to trip.
Hence, option (c) is the correct answer.

Note: Thus, students should be aware about electrical components used in our house and our application and also should have proper knowledge regarding it, so that it can be useful if such harmful condition occurs it can be used in a proper way. So, this type of abbreviation is used in circuits, so it should be learnt thoroughly.