Railway Engineering
The object of providing a point lock is

to ensure that the point may not be operated while the train is on it
to ensure that each switch is correctly set
to detect any obstruction between and tongue rail
None of these

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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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