The maximum efficiency of a screw jack is – McqOptions

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1.	The maximum efficiency of a screw jack is
A.	(1 - sinφ)/(1 + sinφ)
B.	(1 + sinφ)/(1 - sinφ)
C.	(1 - tanφ)/(1 + tanφ)
D.	(1 + tanφ)/(1 - tanφ)
Answer» B. (1 + sinφ)/(1 - sinφ)

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