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Which of these is NOT a reason for using variable-speed operation?

  • A.To save energy on a fluid load at part flow
  • B.To control a process quantity such as flow or tension
  • C.To limit the mechanical shock of starting a large load
  • D.To increase the losses of the driven machine

Answer: D

Correct answer: To increase the losses of the driven machine

The genuine reasons are to save energy on fluid loads, to control a process quantity, and to soften the mechanical and electrical shock of starting. Increasing losses is a consequence to be minimised - a converter itself adds two or three per cent - and never a purpose.

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