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.
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter18: Application Of Motors
Section: Chapter Questions
Problem 9RQ: An open single-phase motor with a centrifugal starting switch may not be used in A. an...
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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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