Machine Design
A stud

Has both the ends threaded
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has pointed threads
Has a head on one end and a nut fitted to the other

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Machine Design
Which of the following statement is correct regarding power screws?

The efficiency of Acme (trapezoidal) thread is less than that of a square thread
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
The efficiency of a self locking screw can not be more than 50%
Both (A) and (B)

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Machine Design
In worm, gears, pitch lead angle is

None of these
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and an element of the cylinder
The angle between the tangent to the pitch helix and the plane of rotation

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Machine Design
Slenderness ratio is the ratio of

Effective length of column to least radius of gyration of the column
Maximum size of column to minimum size of column
Width of column to depth of column
Effective length of column to width of column

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