Physical Metallurgy MCQ Questions and Answers | Metallurgical Engineering Page-5 section-1

41.
Match the names in Group 1 with invarient reactions in binary phase diagram in Group 2.

Group 1 Group 2

P. Eutectic 1. S₁ = S₂ + S₃

Q. Eutectoid 2. L = S₁ + S₂

R. Peritectoid 3. L₁ = L₂ + S

S. Monotectic 4. S₁ + S₂ = S₃

A. P-2, Q-1, R-3, S-4

B. P-2, Q-1, R-4, S-3

C. P-3, Q-4, R-2, S-1

D. P-4, Q-3, R-1, S-2

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42.
Assume that Sievert's law holds for solubility of hydrogen dissolved in a thin metal foil. If the partial pressure of hydrogen in contact with the foil is increased by a factor of 4, the solubility increases by a factor of

A. 1

B. 2

C. 3.6

D. 4.8

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43.
Match the heat treatment processes of steel in Group 1 with the microstructural features in Group 2.

Group 1 Group 2

P. Quenching 1. Bainite

Q. Maraging 2. Martensite

R. Tempering 3. Internietallic precipitates

S. Austempering 4. Epsilon carbide

A. P-2, Q-3, R-1, S-4

B. P-1, Q-3, R-2, S-4

C. P-2, Q-3, R-2, S-1

D. P-3, Q-2, R-1, S-4

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44.
The free energy change during melting of ice at 0°C is equal to

A. Enthalpy of melting–entropy of melting

B. 0

C. 273

D. Can't say without more data

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45.
At which temperature, cementite changes ferromagnetic to paramagnetic character in iron carbon diagram

A. 768°C

B. 910°C

C. 1147°C

D. 210°C

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46.
The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

A. More

B. equal

C. less

D. double

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47.
The peritectic reaction in binary systems is given by

A. L = α + β

B. α = L + β

C. Y = α + β

D. L + α = β

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48.
The critical nucleus size (in mm) when copper melt is under-cooled by 100K is
Given data:
Melting point: 1356 K
Density: 8900 kg.m^-3
Solid-liquid interfacial energy: 0.5 Jm^-2
Latent heat of freezing: 13000 J. mol^-1
Molar volume: 7 × 10^-6 m³ mol^-1

A. 0.36

B. 1.55

C. 3.65

D. 7.30

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49.
Which of the following is true for martensitic transformation in steels?

A. Symmetry of the product is same as that of the parent phase but the unit cell volume decreases

B. Symmetry of the product is different from the parent phase and the unit cell column decreases

C. Symmetry of the product is different from the parent phase but the unit cell volume increases

D. Symmetry of the product is same as that of the parent phase but unit cell volume increases

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50.
If the interfacial energy is increase by 10%, the homogeneous nucleation barrier for a spherical particle increases by

A. 10%

B. 21%

C. 33%

D. 100%

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Group 1	Group 2
P. Eutectic	1. S₁ = S₂ + S₃
Q. Eutectoid	2. L = S₁ + S₂
R. Peritectoid	3. L₁ = L₂ + S
S. Monotectic	4. S₁ + S₂ = S₃

Group 1	Group 2
P. Quenching	1. Bainite
Q. Maraging	2. Martensite
R. Tempering	3. Internietallic precipitates
S. Austempering	4. Epsilon carbide

Physical Metallurgy MCQ Questions and Answers | Metallurgical Engineering

41. Match the names in Group 1 with invarient reactions in binary phase diagram in Group 2. Group 1 Group 2 P. Eutectic 1. S1 = S2 + S3 Q. Eutectoid 2. L = S1 + S2 R. Peritectoid 3. L1 = L2 + S S. Monotectic 4. S1 + S2 = S3

Answer & Solution

42. Assume that Sievert's law holds for solubility of hydrogen dissolved in a thin metal foil. If the partial pressure of hydrogen in contact with the foil is increased by a factor of 4, the solubility increases by a factor of

Answer & Solution

43. Match the heat treatment processes of steel in Group 1 with the microstructural features in Group 2. Group 1 Group 2 P. Quenching 1. Bainite Q. Maraging 2. Martensite R. Tempering 3. Internietallic precipitates S. Austempering 4. Epsilon carbide

Answer & Solution

44. The free energy change during melting of ice at 0°C is equal to

Answer & Solution

45. At which temperature, cementite changes ferromagnetic to paramagnetic character in iron carbon diagram

Answer & Solution

46. The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

Answer & Solution

47. The peritectic reaction in binary systems is given by

Answer & Solution

48. The critical nucleus size (in mm) when copper melt is under-cooled by 100K is Given data: Melting point: 1356 K Density: 8900 kg.m-3 Solid-liquid interfacial energy: 0.5 Jm-2 Latent heat of freezing: 13000 J. mol-1 Molar volume: 7 × 10-6 m3 mol-1

Answer & Solution

49. Which of the following is true for martensitic transformation in steels?

Answer & Solution

50. If the interfacial energy is increase by 10%, the homogeneous nucleation barrier for a spherical particle increases by

Answer & Solution

Read More Section(Physical Metallurgy)

41.
Match the names in Group 1 with invarient reactions in binary phase diagram in Group 2.

Group 1 Group 2

P. Eutectic 1. S₁ = S₂ + S₃

Q. Eutectoid 2. L = S₁ + S₂

R. Peritectoid 3. L₁ = L₂ + S

S. Monotectic 4. S₁ + S₂ = S₃

42.
Assume that Sievert's law holds for solubility of hydrogen dissolved in a thin metal foil. If the partial pressure of hydrogen in contact with the foil is increased by a factor of 4, the solubility increases by a factor of

43.
Match the heat treatment processes of steel in Group 1 with the microstructural features in Group 2.

Group 1 Group 2

P. Quenching 1. Bainite

Q. Maraging 2. Martensite

R. Tempering 3. Internietallic precipitates

S. Austempering 4. Epsilon carbide

44.
The free energy change during melting of ice at 0°C is equal to

45.
At which temperature, cementite changes ferromagnetic to paramagnetic character in iron carbon diagram

46.
The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

47.
The peritectic reaction in binary systems is given by

48.
The critical nucleus size (in mm) when copper melt is under-cooled by 100K is
Given data:
Melting point: 1356 K
Density: 8900 kg.m^-3
Solid-liquid interfacial energy: 0.5 Jm^-2
Latent heat of freezing: 13000 J. mol^-1
Molar volume: 7 × 10^-6 m³ mol^-1

49.
Which of the following is true for martensitic transformation in steels?

50.
If the interfacial energy is increase by 10%, the homogeneous nucleation barrier for a spherical particle increases by