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B. What is heat treatment?
C. Define and explain the processes of the following heat treatment process.
i. Hardening ii. Tempering iii. Case hardening iv. Age hardening
D. List the mechanical properties of the following materials and give TWO (2) engineering applications for each.
i. Glass
Wood iii. Metal
Polymers
E. What is heat treatment and list TI--IREE (3) quenching media.
Ouestion 5
A. Describe THREE (3) applications where tensile strength is primarily factor in material selection. What material would you select for what application and state why?
B. Copper has the atomic radius of Oa 128 nm, an FCC crystal structure and an atomic weight of 63.5 g/mol. Calculate the following:
i. Cell edge length ii. Vc - Unit cell volume iii. Vs — Sphere volume iv. Density,
v. APF - Atomic Pack Factor via Write the Avagador's Number
c. Briefly explain what the factors that caused imperfection in solids are.
A. Make a sketch of the unit cell in a point model form of the following and writer the occupancy numbers and the Coordination numbers:
i. BCC — Body Centred Cubic ii. FCC - Face Centred Cubic iii. HCP - Hexagonal Close Pack
How does the sine and cosine functions affects the symmetry (either
even or odd) of the synthesised periodic signals?
A steel ball with a mass of 0.5 kg and a radius of 10 mm is dropped from a height of 3 m and strikes a homogeneous sheet with a thickness of 1200 mm which is located on a rigid bed. Calculate the maximum penetration, maximum contact force and maximum contact radius in the following three cases. (Assume a modulus of elasticity of 200 GPa, a yield stress of 250 MPa, and a Poisson's ratio of 0.3 if required.)
A) Rigid ball and Linear Elastic plate
B) Rigid ball and rigid-Perfectly Plastic plate
C) Rigid ball and Linear Elastic-Perfectly Plastic
find that at what distance body A will attain a velocity of 3 m/s when starts from rest. Assume coefficient of friction as 0.2 for block and surface and pulleys are frictionless and weightless
A metal cube(faces 20 mm+-0.1mm) fully sinks into a glass full of water. The diameter of the glass is 60 mm+-0,2 mm.Calculate the water rise level and its cumulative error.
A metal cube(faces 20 mm+-0.1mm) fully sinks into a glass full of water. The diameter of the glass is 60 mm+-0,2 mm.Calculate the water rise level and its cumulative error.
solution of differential Equation
12. (2y² + 3xy-2y+6x)dx + x(x+2y-1)dy=0
13.ydx + (3x xy + 2)dy = 0
14. (x³ + xy² + y)dx + (y² + x²y + x)dy = 0
15. (x² + y²)dx-xydy = 0
16.eyy' = x cos x
17. y'=x-2y cot 2x
solution of the Differential equation
7. (1+y² + xy²)dx + (x²y + y + 2xy)dy =0
8. 2ydx + x(x² Iny-1)dy = 0
9. y(2x+y²)dx + x(y²-x)dy = 0
10.(3x²-2y2)y' = 2xy; x = 1, y = 1
11.(2x-3y)dx + (2y-3x)dy; x = 1, y = 1
