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

Nipple joint
Spigot and socket joint
Union joint
Socket joint

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Very serious in ductile materials and less serious in brittle materials
Equally serious in both types of materials
Very serious in brittle materials and less serious in ductile materials
Seriousness would depend on other factors

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Machine Design
A woodruff key is

All of these
Fitted in pairs at right angles
Capable of tilting in a recess milled out in the shaft
A tapered key with head at one end

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