MATSE 201 Final Exam with Complete Solutions 2024/2025, Exams of Nursing

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MATSE 201 Final Exam with complete

solutions 2024/

When a material acquires heat, it will gain kinetic energy in the form of quantized vibrations called _____________. A) thermal shock B) thermal conductivity C) phonons D) photons - ANSWER✓✓-C) phonons The relationship between heat transferred to and absorbed by a substance is given by, Q=m•c•∆T. Which of the following is a major assumption for that relationship? A) No change in dimension over temperature range of ∆T B) No phase change over temperature range of ∆T C) No assumptions are made D) No change in lattice vibrations over temperature range of ∆T - ANSWER✓✓-B) No phase change over temperature range of ∆T Which of the following would NOT decrease thermal conduction? A) Decreasing grain size B) Increasing temperature C) Adding dislocations D) Decreasing bond strength - ANSWER✓✓-B) Increasing temperature

Which of the following would result in higher charge carrier mobility for a material? A) Use single crystal B) Increase temperature C) Add dislocations D) Increase impurities - ANSWER✓✓-A) Use single crystal In intrinsic semiconductors, intrinsic conductivity rises exponentially with increasing temperature. Which of the following explanations explains this rise? A) An increase in ni B) A decrease in mobility C) Intrinsic conductivity does not rise with temperature D) An increase in Eg - ANSWER✓✓-A) An increase in ni The doping of boron into silicon would result in which of the following? A) A p-type material B) An increase in hole concentration C) An extrinsic semiconductor D) All of the above - ANSWER✓✓-D) All of the above Which field vector is a measure of the internal field strength of a material exposed to an external magnetic field? A) M B) B C) X D) H - ANSWER✓✓-D) H? or B In which type of material would you observe a negative magnetic susceptibility? A) Ferrimagnetic material B) Diamagnetic material C) Ferromagnetic material D) Paramagnetic material - ANSWER✓✓-B) Diamagnetic material Which two events are most influenced by electronic polarization A) Absorption and refraction B) Transmission and reflection C) Reflection and refraction

D) Reflection and transmission - ANSWER✓✓-A) Absorption and refraction This property is a measure of the slowing down of electromagnetic radiation as it passes through a material A) photons B) refractive index C) Rayleigh scattering D) Energy band gap. - ANSWER✓✓-B) refractive index Which of the following statements is true? A) Both A and C are true B) In order for a photon to excite an electron over the energy band gap the energy of the photon must be greater than the energy of the band gap C) In order for a photon to excite an electron over the energy band gap the energy of the photon must be less than the energy of the band gap D) In order for a photon to excite an electron over the energy band gap the energy of the photon must be equal to the energy of the band gap - ANSWER✓✓-D) In order for a photon to excite an electron over the energy band gap the energy of the photon must be equal to the energy of the band gap Which of the following statements is true? A) In an engineering application where two different metals will come in contact, make sure to minimize the exposed area of the cathode metal B) Both b and c C) In an engineering application where two different metals will come in contact, make sure the two metals are close together on the galvanic series D) In an engineering application where two different metals will come in contact, make sure the two metals are far apart on the galvanic series - ANSWER✓✓-C) In an engineering application where two different metals will come in contact, make sure the two metals are close together on the galvanic series

Radial steel belted automobile tires are commonly constructed of rubber reinforced with braided steel wire, each strand coated with copper. The copper coating is included to enhance adhesion of the rubber tire casing to the steel wire. Which forms of corrosion might be involved? A) Galvanic, pitting, and erosion corrosion B) Galvanic, hydrogen damage, and gasket corrosion C) Uniform, galvanic, and gasket corrosion D) Uniform, erosion, and dealloying corrosion - ANSWER✓✓-C) Uniform, galvanic, and gasket corrosion Refer to Ti-Ni phase diagram in the equation sheet. Which form of titanium would have the highest efficiency of atom packing? A) Beta-Ti B) Alpha-Ti - ANSWER✓✓-B) Alpha-Ti Refer to the Ti-Ni phase diagram in the equation sheet. Which direction has the highest linear density in beta-Ti? A) [111] B) (111) C) [110] D) [100] - ANSWER✓✓-A) [111] Refer to the Ti-Ni phase diagram in the equation sheet. Which is the closest packed plane in beta-Ti? A) (200) B) (100) C) (110) D) (111) - ANSWER✓✓-C) (110) Refer to the Ti-Ni phase diagram in the equation sheet. The first peak to appear in the x-ray diffraction pattern of beta-Ti is the (110). Given a lattice parameter of 2.95 Å, what angle of 2-theta would you expect the (110) peak to show if Cu (lambda = 1.54 Å) was used as the x-ray source? A) 43.24 degrees B) 30.05 degrees C) 15.65 degrees D) 21.62 degrees - ANSWER✓✓-A) 43.24 degrees

Refer to the Ti-Ni phase diagram on the equation sheet. Which phase of titanium would you expect to have the highest ductility? A) Beta-Ti B) Alpha-Ti - ANSWER✓✓-A) Beta-Ti Refer to the Ti-Ni phase diagram on the equation sheet. In designing a Ti-Ni alloy for a mechanical application, there are two requirements to be met; first, you must minimize the amount of Ni present and second, maximize ductility. Which of the following phases would meet these two requirements? A) hypoeutectoid B) hypereutectic C) hypoeutectic D) hypereutectoid - ANSWER✓✓-A) hypoeutectoid Refer to the Ti-Ni phase diagram in the equation sheet. The Ti-Ni alloy is tested in 3-point bending. The alloy has a flexural strength of 150MPa. What is the failure load if the specimen width is 8mm, specimen height is 2.5mm, and the length is 25mm between the two lower supports? A) 200 MPa B) 10 MPa C) 10 N D) 200 N - ANSWER✓✓-D) 200 N Refer to the Ti-Ni phase diagram in the equation sheet. A rod of the Ti-Ni alloy, Young's modulus equal to 110 GPa, is heated from 20 to 60°C while its ends are maintained rigid (unable to move). What is the amount of stress you would expect to develop if the material had a thermal expansion coefficient of 9.8 x 10-6? A) 43.1 MPa B) 43.1 GPa C) 43.1 Pa D) 43100 Pa - ANSWER✓✓-A) 43.1 MPa Which is the closest packed plane in a FCC? - ANSWER✓✓-(111) Which is the closest packed plane in a BCC - ANSWER✓✓-(110) Which direction has the highest linear density in a BCC? - ANSWER✓✓-[111]

Which form would have the highest efficiency of atom packing? - ANSWER✓✓-(FCC) or (HCP) Which form would have the lowest efficiency of atom packing? - ANSWER✓✓-BCC