In a screw jack, the effort required to lift the load W is given by (where = Helix angle and = Angle of friction)

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This question belongs to Mechanical Engineering Theory Of Machine

Theory of Machine

?

In a screw jack, the effort required to lift the load W is given by (where $$\alpha $$ = Helix angle and $$\varphi $$ = Angle of friction)

A) $${\text{P}} = {\text{W}}\tan \left( {\alpha - \varphi } \right)$$ B) $${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$ C) $${\text{P}} = {\text{W}}\tan \left( {\varphi - \alpha } \right)$$ D) $${\text{P}} = {\text{W}}\cos \left( {\alpha + \varphi } \right)$$

Answer & Solution

Correct Answer: Option B

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In a screw jack the effort required to lift the load...

In a screw jack, the effort required to lift the load W is given by (where $$\alpha $$ = Helix angle and $$\varphi $$ = Angle of friction)

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