Discussion
For the protection of the circuits with resistive loads, ________ MCBs are designed.
Answer: A
The key gives 'L' series MCBs for the protection of circuits with resistive loads. I could not confirm this classification from a standard I could check, so the answer rests on the key. In older makers' classifications the series letters indicated the tripping characteristic, with one series for lighting and resistive loads and others for motors and inductive loads.
The 'R', 'D' and 'A' series are the other options, and the D type is generally known for loads with high inrush currents such as motors and transformers, so it is not the one for resistive loads. The first option is the answer given.
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