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Chapter:

16. What is unit of G from Griffith’s energy criterion?

J-m² J-m J/m² J/m

J/m²

G is surface energy and is given by energy per unit area which can be found out by dividing J by m² to get final answer as J/m².

Hint Answer

17. For polymers close to glass transition temperature which of following can be a value of G?

1 J/m² 900 J/m² 1200 J/m² 1400 J/m²

900 J/m²

900 J/m² can be value of G for polymers close to glass transition temperature as range of G for this case is known to be 2 J/m² to 1000 J/m². As or options lie out of this range, re is only one correct answer.

Hint Answer

18. Fracture stress decreases as fiber diameter decreases.

True False

False

The above statement is false as fracture strength is known to increase when fiber diameter decreases as observed by Griffith.

Hint Answer

19. Which of following is not notch sensitive?

Carbon Steel Plastic FCC metal

FCC metal

Tendency of a material to behave as a brittle material in presence of a notch is termed as notch sensitivity. Carbons, steels and plastics which are notch sensitive while FCC metals aren’t notch senitive.

Hint Answer

20. Charpy test is not a type of impact test.

True False

False

Charpy and Izod test are two standard testing methods in case of impact fracture tests.

Hint Answer

21. What is angle of a standard notch?

10° 20° 45° 30°

45°

As standard notch which is made on material during impact fracture testing has an angle of 45�. The type of notch used in case of Charpy and Izod test is V-notch.

Hint Answer

22. What is dimension of material used in case of Izod test?

10 mm * 10 mm * 75 mm 10 mm * 10 mm * 65 mm 5 mm * 5 mm * 75 mm 5 mm * 5 mm * 65 mm

10 mm * 10 mm * 75 mm

In Izod test specimen is taken of dimension 10 mm * 10 mm * 75 mm where width and breadth of material are 10 mm and 10 mm respectively while length is 75 mm.

Hint Answer

23. What is dimension of material used in case of Charpy test?

10 mm * 10 mm * 55 mm 10 mm * 10 mm * 65 mm 5 mm * 5 mm * 55 mm 5 mm * 5 mm * 65 mm

10 mm * 10 mm * 55 mm

In Charpy test specimen is taken of dimension 10 mm * 10 mm * 55 mm where width and breadth of material are 10 mm and 10 mm respectively while length is 55 mm.

Hint Answer

24. The direction of a blow of hammer is opposite to notch section in case of Izod test.

True False

False

The above statement is false as direction of blow of hammer is opposite to notch section in case of Charpy test and direction are same in case of Izod test.

Hint Answer

25. Which of following is Charpy V impact strength for annealed pure copper?

30 J 31 J 32 J 34 J

34 J

The value of Charpy V impact strength of annealed pure copper is experimentally found out to be 34 J.

Hint Answer

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All Chapters

View all Chapter and number of question available From each chapter from Material-Science

Atomic Structure and Interatomic Bonding

Atomic Structure and Interatomic Bonding

Structure of Crystalline Solids

Structure of Crystalline Solids

Imperfections in Solids

Imperfections in Solids

Diffusion

Mechanical Properties of Metals

Mechanical Properties of Metals

Dislocations and Strengthening Mechanisms

Dislocations and Strengthening Mechanisms

Failure

Phase Diagrams

Phase Transformations in Metals

Phase Transformations in Metals

Applications and Processing of Metal Alloys

Applications and Processing of Metal Alloys

Structures and Properties of Ceramics

Structures and Properties of Ceramics

Topics

This Chapter consists of the following topics

Failure

What is unit of G from Griffith’s energy criterion?

For polymers close to glass transition temperature which of following can be a value of G?

Fracture stress decreases as fiber diameter decreases.

Which of following is not notch sensitive?

Charpy test is not a type of impact test.

What is angle of a standard notch?

What is dimension of material used in case of Izod test?

What is dimension of material used in case of Charpy test?

The direction of a blow of hammer is opposite to notch section in case of Izod test.

Which of following is Charpy V impact strength for annealed pure copper?

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