In the illustrated throttle control system,...

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Question 1 of 2066636eed28f7522a1c51d69f

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

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Question 1 of 20

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🔍 Key Concepts

• Understand which control station is in command by looking at the selector switch contacts between the engine room reference and bridge reference potentiometers. • Note that amplifier M inverts the signal and that the sign (positive or negative) of the error determines whether the ahead or astern function generator is used. • Trace the signal path from the active reference potentiometer through amplifier M to see which throttle valve (ahead or astern) is being driven and in what direction (opening or closing).

💭 Think About

• From the way the contacts are drawn, is the engine room or the bridge actually controlling the throttles in this mode? • If you move the engine room reference potentiometer in the arrow’s direction, does the resulting error at amplifier M become more positive or more negative, and which function generator receives that sign? • Given which function generator is energized, would that tend to open the ahead throttle valve wider, open the astern valve wider, or have no effect at all?

✅ Before You Answer

• Verify which reference signal (engine room or bridge) is actually connected to the input of amplifier M in the position shown. • Confirm whether a positive signal from M is routed to the ahead function generator and a negative signal to the astern function generator (as implied by the diagram). • Check that there is no open contact in the path from the active reference, through M, through the selected function generator and power supply, to the corresponding throttle valve actuator—this will tell you whether any signal is being processed in this operating mode.

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