1.

The efficiency of a screw jack is given by

A. tan (α + φ)/tan α
B. tan α / tan (α + φ)
C. tan (α − φ)/ tan α
D. tan α/ tan (α − φ)
Answer» C. tan (‚âà√≠¬¨¬± ‚Äö√Ñ√∂‚àö‚Ć‚àö‚↠‚âà√¨‚àö√∫)/ tan ‚âà√≠¬¨¬±


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