A. Incident sound waves in a dynamic pickup or microphone lead to the passage of AF current in the coil because- 1) The coil's motion within a magnetic field. 2) The motion within an electrostatic field. 3) A DC voltage is applied to the coil. 4) Changes in the capacitive reactance across the coil. B. An intermittent (as opposed to continuous) motor is one in which the shaft revolves in- 1) An incremental motor. 2) A stepper motor. 3) A selsyn. 4) A fractional motor.
A. Incident sound waves in a dynamic pickup or microphone lead to the passage of AF current in the coil because- 1) The coil's motion within a magnetic field. 2) The motion within an electrostatic field. 3) A DC voltage is applied to the coil. 4) Changes in the capacitive reactance across the coil. B. An intermittent (as opposed to continuous) motor is one in which the shaft revolves in- 1) An incremental motor. 2) A stepper motor. 3) A selsyn. 4) A fractional motor.
Electrical Transformers and Rotating Machines
4th Edition
ISBN:9781305494817
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter3: Inductance In Alternating-current Circuits
Section: Chapter Questions
Problem 10RQ: An inductor has an inductive reactance of 250 Ω when connected to a 60-Hz line. What will be the...
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A. Incident sound waves in a dynamic pickup or microphone lead to the passage of AF current in the coil because-
1) The coil's motion within a magnetic field. 2) The motion within an electrostatic field.
3) A DC voltage is applied to the coil. 4) Changes in the capacitive reactance across the coil.
B. An intermittent (as opposed to continuous) motor is one in which the shaft revolves in-
1) An incremental motor. 2) A stepper motor. 3) A selsyn. 4) A fractional motor.
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