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A centrifuge drive is sized chiefly by

  • A.the breakaway torque at standstill with a full bowl
  • B.the reactive power exchanged with the supply
  • C.the thermal duty of the repeated run-up
  • D.the steady torque required once at full speed

Answer: C

Correct answer: the thermal duty of the repeated run-up

Bringing a loaded bowl up to several thousand revolutions a minute takes a large current for a long time, and the heat generated far exceeds anything the steady running produces. Since the cycle repeats, the machine must be rated on the heat of the whole duty rather than on the modest power needed once at speed.

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