When a double –threaded screw is made to turn 120 degrees about axi – McqOptions

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1.	When a double –threaded screw is made to turn 120 degrees about axis. How much the screw advances through axis?
A.	1⁄3 of pitch of helix
B.	1⁄3 of pitch of screw
C.	1⁄4 of pitch of helix
D.	The advancement is equal to pitch of helix.
Answer» B. 1⁄3 of pitch of screw

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