## Machine Design The bending stress in a curved beam is

Zero at the point other than centroidal axis
Zero at the centroidal axis
Maximum at the neutral axis
None of these

80 to 90%
70 to 83%
63 to 70%
45 to 60%

## Machine Design When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A combination of bending stress and direct shear stress
Direct shear stress only
A combination of torsional shear stress and bending
Bending stress only

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

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 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 maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test

## Machine Design Which of the following formula is used in designing a connecting rod?

Euler's formula
Johnson's straight line formula
Rankine's formula
Johnson's parabolic formula