Which meter indicates relative general speed?

Which meter indicates relative general speed?

• A. RPM meter
• B. Relative general speed meter
• C. Encoder
• D. Frequency meter

Answer: (B)

Measuring relative speed between rotating components focuses on how fast one part is moving compared to another reference. The relative general speed meter is the one that directly displays that difference, so you can see how fast one rotor is leading or lagging the other. An RPM meter shows how fast a single shaft is turning (absolute speed) without reference to another part. An encoder is a sensor that generates pulses for position or speed data, but it isn’t itself a readout of relative speed. A frequency meter measures the electrical frequency of the generator output, which correlates to speed but is an electrical parameter, not the mechanical speed difference between components.

Measuring relative speed between rotating components focuses on how fast one part is moving compared to another reference. The relative general speed meter is the one that directly displays that difference, so you can see how fast one rotor is leading or lagging the other. An RPM meter shows how fast a single shaft is turning (absolute speed) without reference to another part. An encoder is a sensor that generates pulses for position or speed data, but it isn’t itself a readout of relative speed. A frequency meter measures the electrical frequency of the generator output, which correlates to speed but is an electrical parameter, not the mechanical speed difference between components.