a.8.) In a dynamic pickup or microphone, incident sound waves cause AF current to flow in the coil as a result of (a) the coil's motion within a magnetic field. (b) the coil's motion within an electrostatic field. (c) a DC voltage applied to the coil. (d) changes in the capacitive reactance across the coil. a.9.) A motor whose shaft rotates in discrete increments (not continuously) is called (a) an incremental motor. (c) a fractional motor. (d) a selsyn. (b) a stepper motor. a.10.) A photoelectric proximity sensor might have trouble detecting (a) a gray curtain. (b) a black wall. (c) a red ball. (d) All of the above 15
a.8.) In a dynamic pickup or microphone, incident sound waves cause AF current to flow in the coil as a result of (a) the coil's motion within a magnetic field. (b) the coil's motion within an electrostatic field. (c) a DC voltage applied to the coil. (d) changes in the capacitive reactance across the coil. a.9.) A motor whose shaft rotates in discrete increments (not continuously) is called (a) an incremental motor. (c) a fractional motor. (d) a selsyn. (b) a stepper motor. a.10.) A photoelectric proximity sensor might have trouble detecting (a) a gray curtain. (b) a black wall. (c) a red ball. (d) All of the above 15
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