Railway Engineering
When semaphore and warner are installed on the same post, then the stop indication is given when

None of these
both arms are horizontal
both semaphore and warner arms lowered
semaphore arm lowered but warner arm horizontal

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Railway Engineering
Switch angle is the angle between

the outer face of the stock rail and tongue rail
the outer face of the stock rail and the gauge face of the tongue rail
the gauge face of the stock rail and outer face of the tongue rail
the gauge face of the stock rail and tongue rail

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