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

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

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Railway Engineering
Heel divergence is

Always less than flange-way clearance
Always greater than flange-way clearance
Equal to flange-way clearance
Sometimes greater than flange-way clearance

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