Materials Science and Engineering Quiz

Which type of atomic bonding would be expected for Pure Copper (Cu)?

• Van der Waals bond

• Ionic bond

• Metallic bond

• Covalent bond

What is the lattice constant and atomic radius of Aluminum (Al) in meters?

• Lattice constant: 3.14 x 10^-10 m, Atomic radius: 1.25 x 10^-10 m

• Lattice constant: 4.05 x 10^-10 m, Atomic radius: 1.43 x 10^-10 m

• Lattice constant: 5.67 x 10^-10 m, Atomic radius: 2.01 x 10^-10 m

• Lattice constant: 2.98 x 10^-10 m, Atomic radius: 1.89 x 10^-10 m

What is the percent cold work and estimated tensile strength of a cylindrical brass, if its diameter is reduced from 25 mm to 20 mm?

• % Cold work: 36%, Tensile strength: 500 MPa

• % Cold work: 20%, Tensile strength: 450 MPa

• % Cold work: 30%, Tensile strength: 480 MPa

• % Cold work: 45%, Tensile strength: 550 MPa

Which type of grain structure would have the worst creep resistance?

• Oriented columnar

• Polycrystalline

• None of the above

• Single crystal

What type of semiconductor will be formed after doping Sn into Ga2O3?

• Extrinsic semiconductor

• Donor n-type

• Acceptor p-type

• Intrinsic semiconductor

Portray the microstructures and phases present for the 20wt%A – 80wt%B alloy at 780°C.

• Phase 1: α-phase, Phase 2: β-phase

• Phase 1: δ-phase, Phase 2: γ-phase

• Phase 1: β-phase, Phase 2: α-phase

• Phase 1: γ-phase, Phase 2: δ-phase

What is the relative amount of each phase present for the 80wt%A – 20wt%B alloy at 700°C, in terms of weight fraction?

• Phase 1: 50 wt.%, Phase 2: 50 wt.%

• Phase 1: 60 wt.%, Phase 2: 40 wt.%

• Phase 1: 40 wt.%, Phase 2: 60 wt.%

• Phase 1: 70 wt.%, Phase 2: 30 wt.%

How to make a melt of Alloy B become a completely liquid phase at 700°C?

• Increase the temperature

• Decrease the pressure

• Add more alloy into the melt

• None of the above

How to achieve precipitation hardening for A – B alloy?

• None of the above

• Casting, Extrusion, Sintering

• Annealing, Forging, Tempering

• Solid solution treatment, Quenching, Aging

What is the range of wavelength of visible lights that can transmit InN, and what is the color of this material?

• Wavelength: 0.5-0.8 μm, Color: Green

• Wavelength: 0.6-0.9 μm, Color: Yellow

• Wavelength: 0.4-0.7 μm, Color: Blue

• Wavelength: 0.3-0.6 μm, Color: Red