Discussion
The given wiring diagram is ______.
Answer: D
The diagram shows four lamps L1 to L4, each switched by its own switch S1 to S4, with the lamps and switches wired in the zig-zag manner between the neutral N and live L lines along a long run. The key gives this as tunnel wiring, in which a row of lamps along a tunnel is controlled in this way. It is not a godown lighting circuit or jail wiring, and corridor wiring uses two-way switches at the two ends. The answer is option (D); the item depends on recognising the diagram and the key is followed.
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