Machine Design
The piston rod of a steam engine is usually connected to the cross-head by means of

Bolted joint
Universal joint
Knuckle joint
Cotter joint

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Machine Design
Spring stiffness is

Ratio of coil diameter to wire diameter
Its capability of storing energy
Its ability to absorb shocks
Load required to produce unit deflection

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Machine Design
A woodruff key is

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

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