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?
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?
b) Y- 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?
b) Y- 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
b) Cauchy’s stress quadric
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.
Explanation: Double angle method cannot be used to solve Lame’s stress ellipsoid problems, it is used in case of Mohr’s circle. This method mainly has two rule you need to follow.
8 - Question
Principal stress is only the minimum stress.
Explanation: Principal stresses are maximum and minimum stresses which act on the body and planes on which they act are called the principal plane.