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DC flywheel battery
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 1) Calculate the moment of inertia of a flywheel with a inner radius of 10 cm, an outer radius of 40 cm, and a mass of 20 kg. 4.0 1.7 0.85 3.4

 2) If a flywheel is spinning at 70,000 rpm, and has a moment of inertia of 1.7, what is its Kinetic Energy 5.3 MJ 46.5 MJ 93.0 MJ 23.25 MJ

 3) Design the flywheel battery for a UPS for a bank of computers. The computers require 3.6 Kw for 10 minutes. If the flywheel spins at 70,000 rpm and the inner diameter (r1) is 5 cm, what should the outer diameter (r2) be? Assume the mass of the flywheel is 1 kg, the mechanical to electrical conversion efficiency is 100%, and the flywheel can be modeled as a thick walled cylinder. 45.7 cm 30.6 cm 61.2 cm 15.3 cm

 4) Polarity of supply voltage is reversed in which type of braking? regenerative braking dynamic braking plugging none of these

 5) In 4 quadrant operation of a hoist 3rd quadrant represents reverse mtoring reverse braking forward motoring forward braking

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