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Chapter:

Failure

1. The eutectoid mixture of ferrite (α) and cementite (Fe₃C) is called ______

Ledeburite Pearlite Hyper and hypo eutectoid steel Cast iron

Pearlite

The pearlite is formed under equilibrium
Conditions which consists of alternate lamellas or layers of ferrite and Fe₃C.

Hint Answer

2. Which of following phase will be resulted when transformation temperature of steel is in range of 300 °C to 550 °C?

Austenite Pearlite Bainite Martensite

Bainite

At a temperature between 300 �C and 550�C, steel is in form of bainite which is observed from a time temperature transformation diagram which shows transformation time and temperature of transformation.

Hint Answer

3. In continuous cooling transformation diagrams, which of following is true?

The material is cooled rapidly The material is first heated and then cooled rapidly The material is cooled at a certain rate The material is kept at a constant temperature

The material is cooled at a certain rate

In a continuous cooling transformation diagrams, material is cooled at a certain rate instead of heating and n cooling it rapidly and n maintaining a constant temperature in case of TTT diagrams.

Hint Answer

4. In which of following steels re is a chance of quenching cracks being formed?

0.2% carbon 0.4% carbon 0.5% carbon 0.6% carbon

0.6% carbon

If carbon content in a steel is higher than 0.5 %, during quenching re can be a formation of quenching cracks.

Hint Answer

5. In an isormal curve, which of following is true when temperature is increased?

The curve shifts rightward The curve shifts leftward The curve goes down The curve goes up

The curve shifts rightward

In an isormal curve with an increase in temperature curve shifts towards right and with a decrease in temperature curve will shift towards left on graph.

Hint Answer

6. Which is most important rmodynamic parameter in Homogenous nucleation?

Free energy G Enthalpy H Entropy S Free energy G, Enthalpy H, Entropy S

Free energy G

G is important as a phase transformation will occur immediately only when G has a negative value.

Hint Answer

7. Below critical radius tiny particles are _ and are called _

unstable, grains stable, grains unstable, embryo stable, embryo

unstable, embryo

The tiny particle of solid that forms first will get stabilized only when it achieves a critical radius (r*). Below critical radius, it is considered unstable and is said to be an embryo.

Hint Answer

8. Steel with different carbon content shows different time temperature transformation diagrams.

True False

True

The above statement is true. Steel with different carbon content shows different time temperature transformation diagrams.

Hint Answer

9. Which of following is present in pearlite?

Spherodite Bainite Ledeburite Ferrite

Ferrite

Pearlite consists of alternate layer of ferrite and cementite in which cementite is harder and more brittle as compared to ferrite.

Hint Answer

10. How many types of nucleation process are re and what are y?

2 and (fusion and fission) 2 and (Heterogeneous and Homogeneous) 2 and (Heterogeneous and fusion) 4 and (fusion, fission, Heterogeneous and Homogeneous)

2 and (Heterogeneous and Homogeneous)

Two types of nucleation ? Heterogeneous and Homogeneous whereas fusion and fission are nuclear reactions.

Hint Answer

Nexttt

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 Failure consists of the following topics

Phase Transformations in Metals

The eutectoid mixture of ferrite (α) and cementite (Fe₃C) is called ______

Which of following phase will be resulted when transformation temperature of steel is in range of 300 °C to 550 °C?

In continuous cooling transformation diagrams, which of following is true?

In which of following steels re is a chance of quenching cracks being formed?

In an isormal curve, which of following is true when temperature is increased?

Which is most important rmodynamic parameter in Homogenous nucleation?

Below critical radius tiny particles are _ and are called _

Steel with different carbon content shows different time temperature transformation diagrams.

Which of following is present in pearlite?

How many types of nucleation process are re and what are y?

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