Maximum efficiency of a screw jack for the angle of friction , is – McqOptions

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1.	Maximum efficiency of a screw jack for the angle of friction , is
A.	<img src="/_files/images/civil-engineering/applied-mechanics/114-5.203-1.png">
B.	<img src="/_files/images/civil-engineering/applied-mechanics/114-5.203-2.png">
C.	<img src="/_files/images/civil-engineering/applied-mechanics/114-5.203-3.png">
D.	<img src="/_files/images/civil-engineering/applied-mechanics/114-5.203-4.png">
Answer» E.

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