Engineering Board Exam Reviewer · Engineering Materials · easy

Materials composed of metallic and nonmetallic elements bonded mainly by ionic and/or covalent bonds (e.g., oxides, carbides) are called:

  1. Polymers
  2. Metals
  3. Ceramics
  4. Composites

Answer

C. Ceramics

Solution

Ceramics are hard, brittle, heat-resistant and usually electrical insulators.

More Engineering Materials questions

  1. The four major classes of engineering materials are:
  2. Intrinsic silicon at room temperature has 1 × 1016 electrons/m³ (and the same number of holes), with e = 0.14 and h = 0.05 m2/V· s. What…
  3. A steel structure corrodes with a constant corrosion current of 0.01 A. How much iron (Fe Fe2+ + 2e-) is lost in one year? (Fe = 55.85…
  4. A steel plate ( = 7.9 g/cm3) with an exposed area of 645 cm2 loses 485 g to uniform corrosion in one year (8760 h). What is the corrosion…
  5. A component is cyclically loaded between a maximum stress of 200 MPa and a minimum stress of −50 MPa. What are the stress amplitude and…
  6. Using the Hall–Petch equation y = 0 + ky d-1/2 with 0 = 70 MPa and ky = 0.74 MPa · sqrt(m), what is the yield strength for a grain…
  7. A rod is cold drawn from a diameter of 15 mm to 12 mm. What is the percent cold work?
  8. Carbon fibers (tensile strength 3.5 GPa, diameter 10 m) are embedded in a matrix with an interfacial shear strength of 40 MPa. What is the…
  9. A slowly cooled hypoeutectoid steel contains 60% pearlite and 40% proeutectoid ferrite by mass. What is its approximate carbon content?…
  10. For a hypereutectoid steel with 1.2% C cooled slowly to just below 727 °C, what is the mass fraction of proeutectoid cementite? (eutectoid…

All Engineering Materials Reviewer questions