Following are the specifications of a single purchase crab:Diameter of load drum, d = 200 mmLength of lever, l = 1.2 mNo. of teeth on pinion, T1 = 10No. of teeth on spur wheel, T2 = 100On 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.

Following are the specifications of a single purchase crab:Diameter o

1.	Following are the specifications of a single purchase crab:Diameter of load drum, d = 200 mmLength of lever, l = 1.2 mNo. of teeth on pinion, T1 = 10No. of teeth on spur wheel, T2 = 100On 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.
A.	10 %
B.	15 %
C.	20 %
D.	25 %
Answer» E.

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Following are the specifications of a single purchase crab:Diameter of load drum, d = 200 mmLength of lever, l = 1.2 mNo. of teeth on pinion, T1 = 10No. of teeth on spur wheel, T2 = 100On 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 9000N.
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