Question 18-30

Mechanical engineering interview questions with answers which are asked by HR and in technical rounds.

18)   What is factor of safety?
Ans) Factors of safety (FoS), also known as (and used interchangeably with) safety factor (SF), is a term describing the load carrying capacity of a system beyond the expected or actual loads.

19)   What is longitudinal strain?
Ans) Longitudinal strain is defined as the deformation of the body per unit length in the direction of applied load.

20)   What is linear strain?
Ans) Same as longitudinal strain.

21)   What is lateral strain?
Ans)  The strain at right angles to the direction of applied load is known as lateral strain.

22)   What is poisson's ratio?
Ans) The ratio of lateral strain to the longitudinal strain is a constant for the given material, when the material is stressed within the elastic limit. This ratio is called poisson's ratio.

23)   What is principle of superposition?
Ans) When a number  of loads are acting on a body, the resulting strain, according to the principle of superposition, will be algebraic sum of strains caused by individual loads.

24)   What is thermal stress?
Ans) Thermal stresses are introduced in a body due to change in temperature.

25)   What is bulk modulus?
Ans) Bulk modulus is defined as the relative change in the volume of a body produced by a unit compressive or tensile stress acting uniformly over its surface.

26)   What is principle of complementary shear stress?
Ans) It states that a set of shear stresses across a plane is always accompanied by a set of balancing shear stresses across the plane & normal to it.

27)   What is principle planes?
Ans) The planes which have no shear stress, are known as principle planes.

28)   What is principle stresses?
Ans) The normal stresses acting on a principle plane are known as principle stresses.

29)   What are the methods for determining stresses on oblique section?
Ans) *Analytical method
        *Graphical method

30)   What is mohr's circle?
Ans) Mohr's circle is a graphical method of finding normal, tangential & resultant stresses on a oblique plane.