Following are the specifications of a single purchase crab: Diameter of load drum, d = 200 mm Length of lever, l = 1.2 m No. of teeth on pinion, T1 = 10 No. of teeth on spur wheel, T2 = 100 On this machine efforts of 100 N and 160 N are required to lift the loads of 3000 N and 9000 N respectively. Find the efficiency at 3000N.
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