IGNOU MPHE 25 SOLVED ASSIGNMENT

Ques 1.

 Common types of engineering materials are metals, ceramics, polymers and composites. Compare these four classes on the basis of their composition and any two properties. State one application of each type.

Ques 2.

With the help of appropriate diagrams describe the possible ways of accommodating the added alloying elements into a pure metal lattice for the following cases:

i) Limited solubility

ii) Good solubility. 

Ques 3.

Explain the difference between chemical vapour deposition and physical vapour deposition. What are the requirements of a material to be used as a holder for the charge in a thermal evaporation system? Mention any three materials used for the purpose. 

Ques 4.

Given that the density of molten Ge is 5.60 g cm⁻³ calculate the amount of boron required to obtain 10 kg p-type Ge with dopant concentration of 10¹⁷ cm⁻³. Take density of boron = 2.34 g cm⁻³, atomic weight of boron = 10.811 and k₀ = 0.8. 

Ques 5.

What is green compaction in powder processing? How is the porosity of compacted piece reduced? 

Ques 6.

How do the interactions between the substrate and adsorbate atoms determine the growth mode of thin films? Describe the various modes of thin film growth. 

Ques 7.

Describe the various methods of creating point defects. Discuss the constructive (positive) effect of dislocations in materials. 

Ques 8.

Write the symmetries associated with the following 2-D defects:

i) Grain Boundary

ii) Twin Boundary

iii) Stacking Fault 

Ques 9.

In the inclined crystal plane arrange the following sites in the order of increasing possibility of crystal growth site: terraces, kinks, ledges. 

Ques 10.

What is F centre defect? Why is there a characteristic absorption energy associated with the F centre? If the F centre absorption energy for CsCl is 2.0 eV, what is its characteristic absorption wavelength? 

Ques 11.

Explain Fick’s diffusion laws.

Ques 12.

The enthalpy of vacancy formation in nickel is , and its melting point is . What is the equilibrium vacancy concentration in nickel at  ?

Ques 13.

Explain Lever rule with appropriate diagram.

Ques 14.

Differentiate between Avrami and Johnson-Mehl models of phase transformations.

Ques 15.

Explain the Austenite to Martensite diffusionless transformation with example.

Ques 16.

Describe the method of performing Vicker’s hardness test with appropriate diagram.

Ques 17.

Why are the metals opaque to visible light and transparent to x-rays and gamma rays?

Ques 18.

What is luminescence of a material? Differentiate between fluorescence and phosphorescence.

Ques 19.

 Differentiate between ferromagnetism, antiferromagnetism and ferrimagnetism with examples. State the physical significance of magnetic anisotropy.

Ques 20.

What are Fullerenes? Describe any two applications of Fullerenes.

Ques 21.

Explain the working of organic LED.

Ques 22.

 Common types of engineering materials are metals, ceramics, polymers and composites. Compare these four classes on the basis of their composition and any two properties. State one application of each type.

Ques 23.

With the help of appropriate diagrams describe the possible ways of accommodating the added alloying elements into a pure metal lattice for the following cases:

i) Limited solubility

ii) Good solubility. 

Ques 24.

Explain the difference between chemical vapour deposition and physical vapour deposition. What are the requirements of a material to be used as a holder for the charge in a thermal evaporation system? Mention any three materials used for the purpose. 

Ques 25.

Given that the density of molten Ge is 5.60 g cm⁻³ calculate the amount of boron required to obtain 10 kg p-type Ge with dopant concentration of 10¹⁷ cm⁻³. Take density of boron = 2.34 g cm⁻³, atomic weight of boron = 10.811 and k₀ = 0.8. 

Ques 26.

What is green compaction in powder processing? How is the porosity of compacted piece reduced? 

Ques 27.

How do the interactions between the substrate and adsorbate atoms determine the growth mode of thin films? Describe the various modes of thin film growth. 

Ques 28.

Describe the various methods of creating point defects. Discuss the constructive (positive) effect of dislocations in materials. 

Ques 29.

Write the symmetries associated with the following 2-D defects:

i) Grain Boundary

ii) Twin Boundary

iii) Stacking Fault 

Ques 30.

In the inclined crystal plane arrange the following sites in the order of increasing possibility of crystal growth site: terraces, kinks, ledges. 

Ques 31.

What is F centre defect? Why is there a characteristic absorption energy associated with the F centre? If the F centre absorption energy for CsCl is 2.0 eV, what is its characteristic absorption wavelength? 

Ques 32.

Explain Fick’s diffusion laws.

Ques 33.

The enthalpy of vacancy formation in nickel is , and its melting point is . What is the equilibrium vacancy concentration in nickel at  ?

Ques 34.

Explain Lever rule with appropriate diagram.

Ques 35.

Differentiate between Avrami and Johnson-Mehl models of phase transformations.

Ques 36.

Explain the Austenite to Martensite diffusionless transformation with example.

Ques 37.

Describe the method of performing Vicker’s hardness test with appropriate diagram.

Ques 38.

Why are the metals opaque to visible light and transparent to x-rays and gamma rays?

Ques 39.

What is luminescence of a material? Differentiate between fluorescence and phosphorescence.

Ques 40.

 Differentiate between ferromagnetism, antiferromagnetism and ferrimagnetism with examples. State the physical significance of magnetic anisotropy.

Ques 41.

What are Fullerenes? Describe any two applications of Fullerenes.

Ques 42.

Explain the working of organic LED.

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