请问下这个题是怎么做的啊？

kayyeah · 发表于 2014-12-9 12:49:16

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An electric motor isneeded for a hoist. The motor is expected to provide a force of 744 lbf(337.5 kgf) at the edge of a 24-in. (61 cm) diameter pulley. Themotor will run at 1200 RPM and the pulley will be attached to a gearbox toprovide the correct line speed for the hoist. Assume the motor operates at 85%efficiency.

What size, hp (KW),motor should be specified for this application?

A. 170 HP (126.8)

B. 200 HP (149.1)

C. 340 HP (253.5)

D. 400 HP (298.3)

答案选B

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[其他] 请问下这个题是怎么做的啊？

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