Question 217Electricity/Electronics - Assistant Engineer70% to pass
The electrical energy necessary to power a sound-powered telephone's small vibrating bell is obtained from what power source?
AI Explanation
The correct answer is D) each station's hand-cranked generator.
Sound-powered telephones do not require external power sources to operate the small vibrating bells. Instead, they utilize the mechanical energy generated by the user cranking a small hand-operated generator at each station to produce the necessary electrical energy to power the bell. This self-contained power source is a key design feature of sound-powered telephone systems, allowing them to function independently without relying on the ship's main electrical system.
The other options are incorrect because they do not accurately describe the power source for sound-powered telephone bells. The emergency batteries, normal 115V DC supplies, and emergency switchboard are not involved in powering these specialized telephone systems.
Related Questions
#215 A lightly loaded three-phase squirrel-cage induction motor, while running, begins to vibrate excessively but continues to run. After shutting down the motor, the motor will not restart, but makes growling noises, overheats, and smokes. What caused this? #216 A split-phase induction squirrel-cage motor will not start and come up to speed, even though the rated voltage, rated frequency, and rated load are applied. Which of the following troubles would be suspected? #218 Referring to the sound-powered telephone circuit shown in illustration, what statement is true concerning the button on the handset as represented by the component labeled "A"? Illustration EL-0093 #219 Referring to the sound-powered telephone circuit shown in the illustration, in what component are the sound-powered transmitter and receiver units located? Illustration EL-0093 #220 Referring to the sound-powered telephone circuit shown in the illustration, what statement is true? Illustration EL-0093