Which instrument is used to measure solids loading in drilling mud by assessing density and cuttings volume?

• A. Viscosity tester
• B. Hydrometer
• C. Centrifuge
• D. Gel strength meter

Answer: (C)

Solids loading in drilling mud is about how much solid cuttings are carried by the mud. To quantify it, you need to separate the solids from the liquid and measure how much solid material is present. A centrifuge excels at this because it uses high-speed spinning to force heavier solids to settle out, creating a sediment whose volume (and, with drying/weighing, its mass) you can measure. From that, you determine the solids loading and relate it to the mud’s density if needed. The other instruments don’t directly provide a solids-content measurement: a viscosity tester gauges flow behavior, a hydrometer gives liquid density, and a gel strength meter assesses how the mud behaves when set.