*$_Efficiency of a screw jack is given by (where ≈í¬± = Helix ang – McqOptions

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1.	*$_Efficiency of a screw jack is given by (where ≈í¬± = Helix angle, and ≈ì√ú = Angle of friction.)?
A.	tan(≈í¬± + ≈ì√ú)/tan≈í¬±
B.	tan≈í¬±/tan (≈í¬± + ≈ì√ú)
C.	tan(≈í¬± - ≈ì√ú)/tan≈í¬±
D.	None of these
Answer» C. tan(≈í¬± - ≈ì√ú)/tan≈í¬±

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