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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Design of Machine Elements  >  Test: Fracture Mechanics & Thermal Stresses - Mechanical Engineering MCQ

Test: Fracture Mechanics & Thermal Stresses - Mechanical Engineering MCQ


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10 Questions MCQ Test Design of Machine Elements - Test: Fracture Mechanics & Thermal Stresses

Test: Fracture Mechanics & Thermal Stresses for Mechanical Engineering 2025 is part of Design of Machine Elements preparation. The Test: Fracture Mechanics & Thermal Stresses questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Fracture Mechanics & Thermal Stresses MCQs are made for Mechanical Engineering 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Fracture Mechanics & Thermal Stresses below.
Solutions of Test: Fracture Mechanics & Thermal Stresses questions in English are available as part of our Design of Machine Elements for Mechanical Engineering & Test: Fracture Mechanics & Thermal Stresses solutions in Hindi for Design of Machine Elements course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: Fracture Mechanics & Thermal Stresses | 10 questions in 20 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Design of Machine Elements for Mechanical Engineering Exam | Download free PDF with solutions
Test: Fracture Mechanics & Thermal Stresses - Question 1
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The critical value at which crack extension occurs is called

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Explanation: Fracture toughness is the critical value of stress intensity at which crack extension occurs.

Test: Fracture Mechanics & Thermal Stresses - Question 2
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Stress intensity factor is the critical value of stress at which crack extension occurs.

Detailed Solution for Test: Fracture Mechanics & Thermal Stresses - Question 2

Explanation: Stress intensity specifies the stress intensity at the tip of the crack.

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Test: Fracture Mechanics & Thermal Stresses - Question 3
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The critical value at which crack extension occurs is called

Detailed Solution for Test: Fracture Mechanics & Thermal Stresses - Question 3

Explanation: Fracture toughness is the critical value of stress intensity at which crack extension occurs.

Test: Fracture Mechanics & Thermal Stresses - Question 4
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Fracture toughness does not depend upon geometry of the part containing crack
Detailed Solution for Test: Fracture Mechanics & Thermal Stresses - Question 4

Explanation: Fracture toughness is directly proportional to a factor Y that depends upon geometry of the part having crack.

Test: Fracture Mechanics & Thermal Stresses - Question 5
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How many modes are there for crack propagation?
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Explanation: Opening, sliding and tearing are the 3 modes.

Test: Fracture Mechanics & Thermal Stresses - Question 6
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A curved beam has neutral axis is curved while loaded and straight when unloaded. 
Detailed Solution for Test: Fracture Mechanics & Thermal Stresses - Question 6

Explanation: Curved beam’s neutral axis is always curved irrespective of the loading.

Test: Fracture Mechanics & Thermal Stresses - Question 7
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A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm².Considering only bending stress.
Detailed Solution for Test: Fracture Mechanics & Thermal Stresses - Question 7

Explanation: σ(b)=Mh/ AeR or σ(b)=1000x4Dx(4D-0.2D-3.5D)/ 0.8D²x0.02Dx3.5D , σ(b)=21428.6/D²
21428.6/D² = 110 or D=13.95mm.

Test: Fracture Mechanics & Thermal Stresses - Question 8
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A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm² and considering only direct tensile stress.
Detailed Solution for Test: Fracture Mechanics & Thermal Stresses - Question 8

Explanation: Direct Tensile Stress=1000/0.8D² or σ (t) =1250/D²
1250/D²=110 or D=3.4mm.

Test: Fracture Mechanics & Thermal Stresses - Question 9
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The bending stress in a straight beam varies linearly with the distance from neural axis like that in a curved beam.
Detailed Solution for Test: Fracture Mechanics & Thermal Stresses - Question 9

Explanation: Bending stress in a curved beam varies hyperbolically with the distance from neutral axis.

Test: Fracture Mechanics & Thermal Stresses - Question 10
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A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm² and considering combined effect of direct stress and bending stress.
Detailed Solution for Test: Fracture Mechanics & Thermal Stresses - Question 10

Explanation: σ(b)=Mh/ AeR or σ(b)=1000x4Dx(4D-0.2D-3.5D)/ 0.8D²x0.02Dx3.5D , σ(b)=21428.6/D²
DirectTensile Stress=1000/0.8D² or σ (t) =1250/D²
Total stress=22678.6/D² N/mm²= 110 or D=14.35mm.

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