A. With the series wound equipment, the incandescent cab lights burn only with the arc lamp, while with the compound machine the incandescent lamps are independent of the arc and can be used as desired.
30. Q. If you were running along with your light burning steadily and nicely, then suddenly the light began to flash badly and kept it up, where would you look for the trouble?
A. Trouble would usually be found at one of the binding posts, where one of the binding post screws would be found loose.
31. Q. If you were running along with light burning satisfactorily and suddenly it went out, where would you be likely to find the trouble?
A. You would find that either the carbon had burned out, one of the lead wires had broken between the dynamo and the lamp, or one of the wires had gotten loose at the binding post and fallen out.
32. Q. If the light goes out while you are between stations, what course should an engineer pursue?
A. If the light goes out while you are between stations and an investigation cannot be made within a few minutes thereafter to determine the cause, the steam should be shut off from the turbine and the dynamo stopped until such time when the cause of failure can be determined.
33. Q. Why is it essential to shut off steam and stop the equipment?
A. For the reason that if the failure was due to a short circuit, damage might be done to the coils or armature by overheating.
34. Q. How does the equipment act when short-circuited?