Discussion
Which fluid does a viscous coupling contain?
Answer: D
Silicone fluid between closely spaced perforated plates shears as the two halves rotate at different speeds, transmitting torque that rises steeply with the difference. The unit is sealed and cannot be serviced. Magnetorheological fluids are used in dampers rather than couplings. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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