Machine Design
The pipe joint mostly used for pipes carrying water at low pressures is

Socket joint
Nipple joint
Union joint
Spigot and socket joint

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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Have contact at the bottom most of the bearing
Move towards right of the bearing making the metal to metal contact
Move towards right of the bearing making no metal to metal contact
Move towards left of the bearing making metal to metal contact

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Machine Design
Coaxing is the procedure of increasing

Metal hardness by surface treatment
Metal strength by cycling
Fatigue limit by over-stressing the metal by successively increasing loadings
Metal resistance to corrosion by coating

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

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