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Multiple Choice Questions:

Q. 1: A rigid body

1. a) Is an ideal body
2. b) Does not undergo any deformation on application of load
3. c) Both (a) and (b)
4. d) Neither (a) nor (b)

Q. 2: Strength of material is a study of

1. a) Rigid Bodies
2. b) Non-rigid bodies
3. c) Both (a) and (b)
4. d) Neither (a) nor (b)

Q. 3: Which one of the following is a type of load

1. a) Axial
2. b) Shear
3. c) Bending
4. d) All of the above

Q. 4: A shear force acts

1. a) Along the axis of a body
2. b) About the axis of a body
3. c) Along the surface of a body
4. d) All of the above

Q. 5: Frictional force is an example of

1. a) Shear force
2. b) Axial force
3. c) Bending force
4. d) All of the above

Q. 6: The property of material by virtue of which it regain its original shape upon removal of the load is called

1. a) Plasticity
2. b) Rigidity
3. c) Ductility
4. d) Elasticity

Q. 7: The property of virtue of which a material can be formed into thin sheets is called

1. a) Ductility
2. b) Malleability
3. c) Brittleness
4. d) Hardness

Q. 8: Which of the following is a characteristic of Brittle material

1. a) Necking
2. b) Rupture in oblique plane
3. c) High percentage elongation
4. d) Significant reduction in the cross-section area.

Q. 9 Define Stress ?

Whenever some external system of forces acts on a body, it undergoes some deformation. As the body undergoes some deformation, it set up internal resistance to the deformation. This resistance force per unit area to deformation is called Stress.

It is denoted by Sigma (Ïƒ), Unit of Stress is N/m2Â

Q. 10 Define Strain ?

The Deformation per unit length is called Strain. It is dimension less.Â

Q. 11 Define Hook’s Law ?

Hook’s Law state that Whenever material is loaded within elastic limit, stress is directly proportional to strain.

Q. 12 When a change in length take place, the strain is known as __________?

Linear Strain.

Q. 13 Difference between Stress and Strain ?

Q. 14 The change in length due to a tensile or compressive force acting on a body is given by ________?

Î”L = PL/AE

Where P : Tensile or Compressive Load act on body, L: original Length,

A: Area , E: Elasticity Constant, Î”L : Change in Length

Q. 15 The modulus of elasticity for mild steel is approximately equal to _______?

210 KN/mm2

Q. 16 Young’s modulus may be defined as the ratio of__________?

Linear stress to Linear Strain.

Q. 17 Modulus of rigidity may be defined as the ratio of __________?

Shear stress to shear strain.

Q. 18 The unit of young’s modulus is same as that of stress ?

True.

Q. 19 Show the Relation Between Modulus of elasticity , stress and strain?

Q. 20 Strain rosetters are used to measure_______? linear strain.

Q. 21 The ultimate tensile stress for mild steel is _______ the ultimate compressive stress.

Ans. more than

Q. 22 The maximum stress produced in a bar of tapering section is at ____ ?

Ans. smaller end.

Q. 23 Modular ratio of the two materials is the ratio of ______?

their modulus of elasticity.

Q. 24 The shear modulus of most materials with respect to the modulus of elasticity is _______.?

Ans. less than half.

Q. 25 Stress may be defined as

1. a) The load applied per unit area
2. b) The internal resistance force per unit area
3. c) The pressure acting on the material
4. d) None of the above