A. Would test for a broken circuit or open circuit: First, by placing a
carbon across the binding posts at dynamo. If the trouble was in the
dynamo, no flash would be seen, but if dynamo was all right you would
get a flash; this would indicate that the trouble was on towards the
lamp. Second: Go to the lamp, place your carbon across binding posts. If
wire was broken between dynamo and lamp you would not get a flash. If
your wires were all right you would get a flash and you would find your
trouble in the lamp. No doubt, it would be a burned-out carbon.
64. Q. How would you proceed to locate the point of trouble with a short
circuit?
A. Would remove (1) one of the lead wires from the binding post at
dynamo; if trouble was in dynamo you would not note any difference in
action of speed. (2) Would disconnect one of the cab wires; if the
trouble is in cab circuit, speed would increase and lamp would burn. (3)
If trouble is not in cab circuit, would go to lamp, disconnect one of
the main wires from binding post; if short circuit is in the wires
between dynamo and lamp, there would be no change in speed of dynamo,
but if the wires are O. K. the speed of engine would increase and your
trouble would be in the lamp.
=DUPLEX LOCOMOTIVE STOKER=
1. Q. Of what does the driving mechanism of a Duplex Locomotive Stoker
consist?
A. It consists of a steam cylinder with reverse head and valve
arrangement similar to the steam end of an eleven inch Westinghouse air
pump.