Engineering Questions with Answers - Multiple Choice Questions

# Materials Science MCQ’s – Stress Transformation

1 - Question

How many shear stress components can act on a 3-D object?
a) 2
b) 4
c) 5
d) 6
Explanation: On a 3-dimensional body, total 9 stress components can act, out of which 3 are normal stress components while 6 of the other are tangential or shear stress component.

2 - Question

Which type of stress is plane stress?
a) One dimensional
b) Two dimensional
c) Zero dimensional
d) Three dimensional
Explanation: Plane stress is a two-dimensional stress in which stress components on any one direction is zero. For eg. All the stress components pertaining to z component is zero.

3 - Question

Principal plane is the plane in which ___________
a) Shear stress is maximum
b) Normal stress is zero
c) Shear stress is zero
d) It doesn’t depend upon stresses
Explanation: Principle planes are those planes where the value of shear stress is equal to zero and maximum or minimum value of normal stress is present at these points.

4 - Question

In a Mohr’s circle drawn on the x-y plane, which axis is the axis where normal stress is plotted?
a) X-axis
b) Y- axis
c) Z-axis
d) Normal stress isn’t related to Mohr’s circle
Explanation: In a Mohr’s circle, the x-axis or the horizontal axis in the x-y plane is the axis on which normal stress is plotted on. This axis is also called the abscissa.

5 - Question

In a Mohr’s circle drawn on the x-y plane, which axis is the axis where shear stress is plotted?
a) X-axis
b) Y- axis
c) Z-axis
d) Shear stress isn’t related to Mohr’s circle
Explanation: In a Mohr’s circle, the y-axis or the vertical axis in the x-y plane is the axis on which normal stress is plotted on. This axis is called the ordinate.

6 - Question

Which of following is not a graphical method for representing stress?
a) Lame’s stress ellipsoid
c) Lame’s stress circle
d) Mohr’s circle
Explanation: Lame’s stress circle cannot be used for graphical representation of stresses while Lame’s stress ellipsoid, Mohr’s circle and Cauchy’s stress quadric are used for graphically representing stress.

7 - Question

Double angle method is a method to solve the problem in Lame’s stress ellipsoid.
a) True
b) False