Machine Design
In order to obtain bolt of uniform strength

Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
Tighten die bolt properly
Increase its length
Increase shank diameter

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Machine Design
In a hydrodynamic lubricated bearing

There is a thin film of lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure

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Machine Design
The shear stress at a point in a shaft subjected to a torque is

Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Inversely proportional to the applied torque and the polar moment of inertia
Directly proportional to the applied torque and the polar moment of inertia

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Machine Design
A fast and loose pulley drive is used when

Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions

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