The
efficiency of self-locking screw is ________ .
सेल्फ-लॉकिंग स्क्रू की दक्षता ________ है।
More
than 50%
Less
than 50%
Equal
to 50%
None
of these
Less
than 50%
A
screw will be self-locking, if the friction angle is greater than helix angle
i.e, 
, and the efficiency is given by
Thus,
efficiency 
must be less than or
equal to 500
Hence,
the correct option is (B).
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