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A synchronous machine with a cylindrical rotor is normally used for

  • A.drives that must start against full load
  • B.high-speed drives with few poles
  • C.very low-speed drives with a great many poles
  • D.drives requiring reluctance torque without excitation

Answer: B

A smooth rotor withstands the centrifugal stress of two- or four-pole operation, which salient poles would not. Slow many-poled machines are built with salient poles, which are cheaper and give some reluctance torque as well.

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