To ensure self-locking in a screw jack it is essential that helix angl

1.	To ensure self-locking in a screw jack it is essential that helix angle is:
A.	Larger than friction angle
B.	Smaller than friction angle
C.	Equal to friction angle
D.	Such as to give maximum efficiency in lifting
Answer» C. Equal to friction angle

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To ensure self-locking in a screw jack it is essential that helix angle is:

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