A Patient Informs His Physician That He Is Experiencing a Loss

question 21

Multiple Choice

A patient informs his physician that he is experiencing a loss of hearing.His job regularly exposes him to high levels of constant noise.The part(s) of the hearing pathway most likely damaged is/are the

• A) tympanic membrane.
• B) ossicles.
• C) round window.
• D) hair cells.
• E) vestibular membrane.

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Definitions:

Transistor

A semiconductor device used to amplify or switch electronic signals and electrical power, fundamental in modern electronic circuits.

V-Ref

Reference voltage. ECU or ECM conditioned voltage (usually 5 volts DC) supplied to various sensors (such as thermistors, potentiometers) in truck electronic circuits. In most cases, a portion of the voltage is returned to indicate the status of sensor.

Potentiometer

A three-terminal voltage divider. The terminals are identified as supply voltage, signal voltage, and ground. The position of the slider on the device resistive track determines how supply voltage is divided between the signal and ground paths.