Machine Design
The algebraic difference between the maximum limit and the basic size is called

Lower deviation
Mean deviation
Upper deviation
Actual deviation

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Machine Design
A woodruff key is

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
All of these

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of bending stress and curvature of the wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of transverse shear stress and curvature of wire
Combined effect of transverse shear stress and bending stress in the wire

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Machine Design
According to Rankine's theory, the failure occurs at a point in a member

When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test
When the maximum shear stress in a biaxial stress system reaches the shear stress at elastic limit in a simple tension test
When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test
When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test

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