| As shown in the illustrated wiring diagram for an engine order telegraph system, what statement concerning the constant ringing and trouble alarm is true? |
| A) The constant ringing and trouble alarm sounds when there is a power loss from the battery or emergency switchboard as appropriate. |
| B) The constant ringing and trouble alarm sounds when there is a power loss from the 115 VAC power supply to the system. |
| C) The constant ringing and trouble alarm sounds when the acknowledge handle and indicator arrow are not on the same order. |
| D) The constant ringing and trouble alarm sounds when the transmitter rotor and corresponding indicator rotor are in correspondence. |
