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Test: Modes of Failure & Stresses - Mechanical Engineering MCQ


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10 Questions MCQ Test Strength of Materials (SOM) - Test: Modes of Failure & Stresses

Test: Modes of Failure & Stresses for Mechanical Engineering 2024 is part of Strength of Materials (SOM) preparation. The Test: Modes of Failure & Stresses questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Modes of Failure & Stresses MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Modes of Failure & Stresses below.
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Test: Modes of Failure & Stresses - Question 1

 A mechanical component may fail as a result of which of the following

Detailed Solution for Test: Modes of Failure & Stresses - Question 1

A mechanical component may fail i.e. it may be unable to perform its function satisfactorily, as a result of any one of the following three modes of failure:

  1. Failure by elastic deflection.
  2. Failure by Yielding
  3. failure by Fracture

1. Failure by elastic deflection

  • In applications like transmission shaft supporting the gears, the maximum force acting on the shaft, without effecting it performance is limited by the permissible elastic deflection. Sometimes the elastic deflection results in unstable conditions, such as buckling of columns or vibrations. The design of mechanical component, in all these cases, is based on the permissible lateral or torisional deflection. The stresses induced in the component are not significant and properties of the material are not of primary importance. The moduli of elasticity and rigidity are the important properties and dimension of component are determined by the load deflection equation.
  • In short, in a components like : columns, beams, shafts etc.,the torsional deflection in an elastic region is termed as failure of the component

2. Failure by Yielding

  • For ductile material deformation occurs after the yield point, resulting in permanent deformation of the machine element which ultimately breaks at breaking point. Hence for ductile materials, failure is usually considered to have occurred when yielding i.e. plastic deformation reach a limit, when engineering usefulness of the part is destroyed, even through there is no rupture or fracture of machine part. Thus, the yield point is criterion of failure of ductile materials subjected to static loading.
  • In short, when a mechanical component, made of ductile material, undergoes yielding or plastic deformation, its functional utility comes to an end and it is termed as failure of the component. Such failure is known as elastic failure.

3. Failure by fracture

  • In case of brittle materials the yield point and ultimate strain is very nearly equal to unity. So brittle materials are considered to have failed by fracture with little or no permanent deformation.
  • Sudden separation or a breakage of a material along the cross-section normal to the direction of stress is known as fracture. Fracture is a sudden failure without plastic deformation. The failure of components made of brittle material is due to fracture.
Test: Modes of Failure & Stresses - Question 2

Type of load affects factor of safety.

Detailed Solution for Test: Modes of Failure & Stresses - Question 2

Explanation: Dynamic load has higher factor of safety as compared to static loading.

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Test: Modes of Failure & Stresses - Question 3

For cast iron components, which of the following strength are considered to be the failure criterion?

Detailed Solution for Test: Modes of Failure & Stresses - Question 3

Explanation: Ultimate tensile strength is the highest stress a component can undergo before failingand hence is used as a criterion.

Test: Modes of Failure & Stresses - Question 4

 For components made of ductile materials like steel, subjected to static loading which of the following strength is used as a failure of criterion?

Detailed Solution for Test: Modes of Failure & Stresses - Question 4

Explanation: In elastic material there is considerable plastic deformation at yielding point.

Test: Modes of Failure & Stresses - Question 5

Pitting occurs on _____ of the component. 

Detailed Solution for Test: Modes of Failure & Stresses - Question 5

Explanation: Pitting is a process in which small holes occur on a surface of component.

Test: Modes of Failure & Stresses - Question 6

 Buckling is elastic instability which leads to sudden large lateral deflection.

Detailed Solution for Test: Modes of Failure & Stresses - Question 6

Explanation: Definition of buckling.

Test: Modes of Failure & Stresses - Question 7

The critical buckling load depends upon which of the following parameters?

Detailed Solution for Test: Modes of Failure & Stresses - Question 7

Explanation: It depends on moment of inertia(which further depends on radius of gyration), elasticity and yield strength.

Test: Modes of Failure & Stresses - Question 8

If there are residual stresses in the material, than lower factor of safety is used.

Detailed Solution for Test: Modes of Failure & Stresses - Question 8

Explanation: Residual stress increases the chance of failure.

Test: Modes of Failure & Stresses - Question 9

Which of the following relationship is true? (p=Poisson’s ratio)

Detailed Solution for Test: Modes of Failure & Stresses - Question 9

Explanation: Formula.

Test: Modes of Failure & Stresses - Question 10

According to principal stress theory, which option represents the correct relation between yield strength in shear (YSS) and the yield strength in tension (YST)?

Detailed Solution for Test: Modes of Failure & Stresses - Question 10

Explanation: Shear diagonal is at 45’ and by equation of shear stress theory, the required relation is obtained.

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