Discussion
The power absorbed by a centrifugal pump at 80 per cent of rated speed is about
Answer: B
Correct answer: 51 per cent of rated
Power varies as the cube of speed for a centrifugal machine: \[ 0.8^3 = 0.512, \] about 51 per cent. This cube law is the whole economic case for variable-speed pumping and fanning - a twenty per cent reduction in speed halves the power.
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