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Mechanical Behaviour & Testing of Materials Multiple Choice Questions | MCQs | Quiz

Mechanical Behaviour & Testing of Materials Interview Questions and Answers
Practice Mechanical Behaviour & Testing of Materials questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Crystal Structures Basics
•   Point Imperfections
•   Line Imperfections
•   Surface Imperfections
•   Volume Imperfections
•   Tensile Strength
•   Yield Strength
•   Compressive Strength
•   Ductility
•   Malleability
•   Stiffness
•   Toughness
•   Creep Strength
•   Hardness
•   Impact Strength
•   Fatigue Strength
•   Formability
•   Structure Mechanical
•   Ideal & Real Crystals
•   Dislocations Geometry
•   Burgers Vector
•   Dislocations Movement
•   Dislocation Elastic Property
•   Dislocations Forces
•   Unit & Partial Dislocations
•   Peierls Nabarro Stress
•   Dislocation Multiplication
•   Dislocation Intersection
•   Ceramics Dislocations
•   Elastic Deformation
•   Plastic Deformation
•   Twinning Deformation
•   Ceramics Behaviour
•   ↓ Strengthening ↓
•   Grain Boundary
•   Solid Solution
•   Precipitation Hardening
•   Dispersion Hardening
•   Strain Hardening
•   Martensitic Strengthening
•   Composite Strengthening
•   Plastics Strengthening
•   Ceramics Strengthening
•   Strengthening Mechanisms
•   Ductile Fracture
•   Ductile Fracture Mechanism
•   Brittle Fracture
•   Brittle Fracture Mechanism
•   Fracture Affecting Factors
•   Tension Test
•   Tensile Properties
•   True Stress Strain Curve
•   Yield Point Phenomenon
•   Tensile Properties-Variables
•   Creep Curve
•   Creep - High Temperature
•   Equicohesive Temperature
•   Elevated Temperature
•   Creep Deformation
•   Creep Behaviour Factors
•   Creep Resistant Materials
•   Ductile Brittle Transition
•   Transition Temperature
•   Notch Bar Impact Test
•   Impact Value Variables
•   Fracture Toughness
•   Ceramics Toughening
•   Stress Cycles
•   Fatigue Test
•   Iron & Steel Behaviour
•   Fatigue Mechanism
•   Low Cycle Fatigue
•   Variables Affecting Fatigue
•   Scratch Hardness
•   Indentation Hardness
•   Brinell Hardness Test
•   Vickers Hardness Test
•   Rockwell Hardness Test
•   Microhardness Test
•   Dynamic Hardness Testing
•   Liquid Penetrant Inspection
•   Eddy Current Inspection
•   Radiographic Inspection

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Mechanical Behaviour Questions and Answers – Yield Point Phenomenon

Posted on August 24, 2018 by Manish

This set of Mechanical Behaviour Multiple Choice Questions & Answers (MCQs) focuses on “Yield Point Phenomenon”.

1. The elongation that occurs at constant load is called ____
a) Homogeneous elongation
b) Elastic elongation
c) Yield point elongation
d) Constant elongation
View Answer

Answer: c
Explanation: Yield point elongation is the elongation that occurs at constant load. It is about 15 to 20 times the elastic elongation. Elastic elongation is 0.1 percent for most of the metals.
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2. The yield point is ____
a) Stress
b) Strain
c) Toughness
d) Resilience
View Answer

Answer: a
Explanation: The stress at which transition occurs above the elastic limit is called yield point. It can be sharp or gradual.

3. Which material shows yield point phenomena?
a) Aluminium
b) Copper
c) Low carbon steel
d) Glass
View Answer

Answer: c
Explanation: Aluminium and copper are ductile materials with gradual yield point. Glass is ceramic which rarely undergo yielding. Low carbon steel shows yield point phenomenon.

4. Yield point elongation is ____ times the elastic elongation.
a) 2
b) 20
c) 200
d) 2000
View Answer

Answer: b
Explanation: Elastic elongation is generally 0.1 percent. Yield point elongation is 15 to 20 times the elastic elongation. This point may vary from material to material.

5. What term is used for the load at which a sudden drop occurs in a conventional tensile curve?
a) Plastic instability
b) Upper yield point
c) Lower yield point
d) Static load
View Answer

Answer: b
Explanation: Yield point is of two types. The upper yield point is the load at which a sudden drop occurs in a conventional tensile curve. Lower yield point is lower constant load at which appreciable yielding occurs.
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6. Which term is different from others?
a) Yield point
b) Fracture point
c) Proportional limit
d) Elastic limit
View Answer

Answer: b
Explanation: Fracture point is different from the other three terms. Other three terms define the stress above Hooke’s limit. At this point, stress is no longer proportional to strain produced.

7. Stretcher strains are because of ____
a) Necking
b) Strain hardening
c) Lüders bands
d) Cold rolling
View Answer

Answer: c
Explanation: stretcher strains are because of lüders bands. These bands generate irregularities on the sheet surface. It destroys the surface finish.

8. What process is used to overcome stretcher strains?
a) Deep drawing
b) Skin rolling
c) Bending
d) Finishing
View Answer

Answer: b
Explanation: Skin rolling treatment is given to sheets. It removes the discontinuous yield point from tensile curve. Hence stretcher strains don’t ruin the sheet surface finish.

9. What percent of cold reduction is given in skin rolling?
a) < 0.5%
b) 0.5-2%
c) 2-5%
d) 5-10%
View Answer

Answer: b
Explanation: In skin rolling small cold reduction is given to the sheet. It is in the range of 0.5-2%. It is given immediately before the forming operation so as to avoid the recurrence of yield point.

10. What is the main reason for discontinuous yielding?
a) Grain boundaries
b) Substitutional atoms
c) Interstitial atoms
d) Vacancies
View Answer

Answer: c
Explanation: Discontinuous yielding is caused by the presence of interstitial atoms. These may be carbon and nitrogen atoms in steel. These atoms lock the dislocations.
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11. Cottrell atmosphere is a yield point phenomenon related term.
a) True
b) False
View Answer

Answer: a
Explanation: Solute atoms in material tend to restrict motion of dislocations. These atoms occupy positions below edge dislocations. This is called the Cottrell atmosphere.

12. Lower stress is required to initiate yielding.
a) True
b) False
View Answer

Answer: b
Explanation: Once dislocations are made free, their motion needs the lower stress. A higher stress is required to initiate yielding. But a lower stress is required to continue it.

Sanfoundry Global Education & Learning Series – Mechanical Behaviour & Testing of Materials.

To practice all areas of Mechanical Behaviour & Testing of Materials, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Facebook | Twitter

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