Question 143Electricity & Electronics - 1st Asst/Chief

70% to pass

In the illustrated throttle control system, the amplifier 'M" functions to invert the signal received from the engine room or bridge reference potentiometer as appropriate. According to the operating mode selected for in the illustration, moving the engine room reference potentiometer in the direction indicated will have what effect? Illustration SE-0002

Diagram for USCG Electrical Chief: In the illustrated throttle control system, the amplifier 'M" functions to...

AIt will cause a negative signal to be processed by the ahead function generator ultimately causing the astern throttle valve to open wider.

BIt will cause a negative signal to be processed by the ahead function generator ultimately causing the ahead throttle valve to open wider.

CIt will cause a positive signal to be processed by the ahead function generator ultimately causing the ahead throttle valve to open wider.

DNo signal will be processed because the bridge is currently in control of the throttles.

AI Explanation

The correct answer is C. According to the information provided, the amplifier "M" functions to invert the signal received from the engine room or bridge reference potentiometer. In the illustrated operating mode, moving the engine room reference potentiometer in the direction indicated will cause a positive signal to be processed by the ahead function generator, ultimately causing the ahead throttle valve to open wider. This is because the amplifier "M" inverts the signal, turning a negative input from the engine room reference potentiometer into a positive signal for the ahead function generator. The other options are incorrect because they do not accurately describe the effect of the inverted signal on the throttle control system.

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