A screw is said to be over hauling screw, if its efficiency is

1.	A screw is said to be over hauling screw, if its efficiency is
A.	More than 50%
B.	Less than 50%
C.	Equal to 50%
D.	None of these
Answer» B. Less than 50%

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A screw is said to be over hauling screw, if its efficiency is

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