Technician A says air core electromagnetic gauges and quartz swing needle displays are similar. Technician B says in quartz needle displays, the A coil is connected to the system voltage and the B coil receives a voltage proportional to input frequency. Who is correct?
A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question

Quizplus · Accepted Answer

Both Technician A and B are correct. Air core electromagnetic gauges and quartz swing needle displays are similar in that they both use a moving coil to indicate a value. However, in quartz needle displays, the A coil is connected to the system voltage and the B coil receives a voltage proportional to input frequency. This allows the quartz needle display to indicate both voltage and frequency.

Technician a Says Air Core Electromagnetic Gauges and Quartz Swing