Related Questions

A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called
A Ring nut
B Castle nut
C Sawn nut
D Jam nut
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.
A Larger than
B Smaller than
C Equal to
D None of these
A screw will be self locking, if
A Friction angle is less than helix angle
B Friction angle is more than helix angle
C Friction angle is equal to helix angle
D Efficiency of screw is 100%
A self locking screw has
A Fine threads
B Course threads
C Coefficient of friction is greater than tangent of load angle
D Hole for inserting split pin
A screw is said to be over hauling screw, if its efficiency is
A less than 50%
B more than 50%
C equal to 50%
D none of the mentioned
For a self locking machine, the efficiency must be
A Equal to 50%
B Less than 50%
C Greater than 50%
D 100%
For a self-locking machine, the efficiency should be
A Less than 60%
B 50%
C More than 50%
D None of these
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as
A both ends fixed
B both ends hinged
C one end fixed and other end hinged
D one end fixed and other end free.
A screw is said to be over hauling screw, if the
A Friction angle is less than helix angle
B Friction angle is more than helix angle
C Friction angle is equal to helix angle
D Efficiency of screw is 100%
(b) Change the narration of the following : (i) " You know it isn't safe to go to bed without locking the door", he said to his son.
A He said to his son whether he (son) knew the safety to go to bed without locking the door.

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