SM 3

Poisson's ratio is the ratio of linear strain to the volumetric strain.

• True

• False

A steel bar 2 m long. 20 mm wide and 10 mm thick is subjected to a pull of 2 kN. If the same bar is subjected to a push of 2 kN, the Poission's ratio of the bar in tension will be the Poisson's ratio for the bar in compression.

• equal to

• less than

The Poisson's ratio for steel varies from

• 0.23 to 0.27

• 0.25 to 0.33

• 0.31 to 0.34

• 0.32 to 0.42

The Poisson's ratio for cast iron varies from

• 0.23 to 0.27

• 0.25 to 0.33

• 0.31 to 0.34

• 0.32 to 0.42

When a bar of length I, width b and thickness is subjected to a pull of P, its

• length, width and thickness increases

• length, width and thickness decreases

• length increases, width and thickness decreases

• length decreases, width and thickness increases

The ratio of change in volume to the original volume is called

• linear strain

• lateral strain

• volumetric strain

• Poisson's ratio

When a bar of length l, width b and thickness t is subjected to a push of P, its

• length, width and thickness increases

• length, width and thickness decreases

• length increases, width and thickness decreases

• length decreases, width and thickness increases

The volumetric strain is the ratio of the

• original thickness to the change in thickness

• change in thickness to the original thickness

• original volume to the change in volume

• change in volume to the original volume

When a rectangular bar of length l, breadth b and thickness t is subjected to an axial pull of P, then linear strain (ε) is given by

When a rectangular bar of length l, breadth b and thickness t is subjected to an axial pull of P, then volumetric strain is Where ε =Linear strain and 1/m =poission's ratio

• ε(1-2m)

• ε(2m-1)