Engineering Board Exam Reviewer · Engineering Materials · medium

The band gap of silicon at room temperature is approximately:

  1. 0.01 eV
  2. 5.5 eV
  3. 13.6 eV
  4. 1.1 eV

Answer

D. 1.1 eV

Solution

Germanium 0.67 eV; diamond 5.5 eV.

More Engineering Materials questions

  1. Materials in which the valence band and conduction band overlap, allowing easy electron flow, are:
  2. Which of the following metals is most noble (least likely to corrode) in the galvanic series in seawater?
  3. Anodizing is a process used mainly to protect:
  4. Cracking caused by the combined action of tensile stress and a corrosive environment is called:
  5. Corrosion that occurs in narrow gaps such as under gaskets or bolt heads is called:
  6. Localized corrosion that forms small holes or cavities on a metal surface is called:
  7. In a steel–copper galvanic couple in seawater, which metal corrodes preferentially?
  8. When two dissimilar metals are in electrical contact in an electrolyte, the corrosion of the more active metal accelerates. This is called:
  9. In a longitudinally loaded composite with 60% fibers (Ef = 230 GPa) and 40% matrix (Em = 3.5 GPa), what percentage of the load is carried…
  10. A composite contains 60% by volume carbon fibers ( = 1.8 g/cm3) in epoxy ( = 1.2 g/cm3). What is its density?

All Engineering Materials Reviewer questions