In a Wilson-Hartnell type of governor, the mass of each flyball is 10 kg. The lengths of the flyball arm and the sleeve arm of each bell crank lever are 100 mm and 50 mm respectively. The stiffness of each of the two springs attached directly to the flyballs is 0.5 N/mm. The lever for the auxiliary spring is pivoted at its midpoint. When the radius of rotation is 100 mm, the equilibrium speed is 400 rpm. If the sleeve is lifted by 10 mm for an increase of speed of 10%, find the required stiffness of the auxiliary spring. Select one: A. 501 N/mm B. 201 N/mm C. 401 N/mm D. 301 N/mm

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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In a Wilson-Hartnell type of governor, the mass of each flyball is 10 kg. The lengths of the flyball arm and the sleeve arm of each bell crank lever are 100 mm and 50 mm respectively. The stiffness of each of the two springs attached directly to the flyballs is 0.5 N/mm. The lever for the auxiliary spring is pivoted at its midpoint. When the radius of rotation is 100 mm, the equilibrium speed is 400 rpm.

If the sleeve is lifted by 10 mm for an increase of speed of 10%, find the required stiffness of the auxiliary spring.

Select one:
A.

501 N/mm

B.

201 N/mm

C.

401 N/mm

D.

301 N/mm

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