Engine General (Supplementary) USCG Question #1228 (Set 23)

Suppose a temperature transmitter has an input range from 0 to 100 degrees Celsius and an output range of 4 to 20 milliamps. Assuming that the transmitter has a linear response pattern, what is the output current in milliamps if the input temperature is 40 degrees Celsius?

Official USCG Answer & Rule Citation

Correct Answer: Option B — 10.40 mA

The calculation uses the formula: Output = 4mA + ((Input - MinInput) / (MaxInput - MinInput)) * (MaxOutput - MinOutput). For 40 degrees: 4 + ((40 - 0) / (100 - 0)) * (20 - 4) = 4 + (0.4 * 16) = 4 + 6.4 = 10.40 mA. This represents the linear signal transmission.

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