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Tec 111: Introduction To Material Science Question Paper

Tec 111: Introduction To Material Science

Course:Bachelor Of Engineering In Electrical And Telecommunications Engineering

Institution: Moi University question papers

Exam Year:2011

TEC 111: INTRODUCTION TO MATERIAL SCIENCE CAT I

QUESTION ONE
a. Iron, Z = 26, may show a valence of 2 or 3. State the electron configuration for the two valence states of Iron. (2mks)

b. The mass of cobalt-60 in a sample is found to have decreased from 5.4 grams to 1.20 grams in a period of 10.6 years from their formation. Calculate the half-life of cobalt-60. (4mks)

c. Define the following terms as used in atomic structure and bonding.
i. Orbital
ii. Isobare (2mks)

d. Why is the planetary model of an atom with the nucleus playing the role of the sun and the electrons playing the sold of planets unacceptable?

QUESTION TWO
a. State two requirements of a good matrix in a composite material. (2mks)

b. What do you understand by the following terms as used in material science?
i. Condensation polymerisation
ii. Degree of polymerisation
iii. Amorphous ceramic
iv. Particle composites. (4mks)

c. When is the 'greatest reign-forcing effect and maximum strength obtained in a fibre reign forced composite material?

d. By use of an equation show condensation polymerization of ethylene glycol and terephthalic acid. (2mks)

QUESTION THREE
a. In a fibre reinforced composite the continually aligned cylindrical fibres are packed closely as is possible in a single direction. Given that the relative densities of fibre material and matrix are 2.41 and 1.28 respectively, calculate the maximum relative density of the resultant composite assuming pure ingredients. (5mks)

b.
i. State Pauli exclusion principle. (2mks)
ii. Explain why chromium (Cr) 24 and copper (Cu) 29 have irregularities during the filling of the 3d and 4s shells in the periodic table of elements. (3mks)

Tec 111: Introduction To Material Science Question Paper

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