Oxide Density (g/cm) MgMgo 3.60 Na-Na,0 2.27 T-TIO, Fefe,0, 5.10 5.30 CeCe,Os 6.86 4.47 wwo, 730

1.a ) If two bituminous samples have the same consistency , describe the criteria which can be used to select the better bituminous sample. b) what does higher softening point of bitumen indicate??

Explain the difference (in concept or definition) between boundary layer thickness and thermal boundary layer thickness?

Difference between Sedimentation & Filtration

Sketch how on silicon wafer NiCR is deposited? (Evaporation technique) Sketch how NiCR layer is coated with photoresist and exposed to UV light? Sketch how SU8 is deposited on NiCR layer and exposed to UV light?

Explain briefly the difference between crystalline and amorphous regions in a polymer.

Layers %R AT Surface Ts 1. Inside air film 20 0.037 2. hardboard, medium density 25mm 0.073 3. concrete blocks, rectangular core:lightweight aggregate 2 core 200mm 0.118 4. expanded poystyrene molded beads 100mm 0.764 5. Outside air film in vented cavity 0.009 What is the AT of the above shown wall for layer 4 (expanded polystyrene molded beads 100mm)? The inside air temperature is +20°C, and the outside air temperature is -4°C. The units for your answer are °C, and your answer is correct if it is within 10% of the correct answer.

Q13. The wear resistance of a steel gear is to be improved by hardening its surface. This is to be accomplished by increasing the carbon content within an outer surface layer as a result of carbon diffusion into the steel; the carbon is to be supplied from an external carbon-rich gaseous atmosphere at an elevated and constant temperature. The initial carbon content of the steel is 0.20 wt%, whereas the surface concentration is to be maintained at 1.00 wt%. For this treatment to be effective, a carbon content of 0.60 wt% must be established at a position 0.75 mm below the surface. Specify an appropriate heat treatment in terms of temperature and time for temperatures between 900 °C and 1050 °C (you may select any 3 temperatures). For the diffusion of carbon in steel, Do = 2.3 x 10 m/s, Q = 148 kJ/mol. (The error function values are given below) erf(2) erf(z) 0.55 0.60 1.3 1.4 0.5633 0.9340 0.025 0.0282 0.6039 0.9523 0.05 0.0564 0.65 0.6420 1.5 0.9661 0.10 0.1125 0.70 0.6778 1.6 0.9763…

1. Summary the classification of pores 2. Summary the factors affecting porosity

How do the key membrane characteristics, such as pore size, porosity, and surface charge, influence the separation efficiency and selectivity of a membrane-based process in chemical engineering?