Questions

Multiple-choice questions you can practise one by one. Open a question, tap an answer and see at once whether it is right. For a random set, try Quick practice.

941 questions

• Why does a metal generally carry more current than an insulator under comparable conditions?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• A large-gap material is mechanically strong. What else must be tested for high-voltage insulation?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Exciting an electron from valence to conduction band produces:

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why does a trivalent impurity usually make silicon P-type?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Which statement about a conductor's valence electrons is most defensible?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why is conductivity not determined by atom count alone?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• An atom loses one electron while its nucleus remains unchanged. It becomes:

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• What is a hole in band theory?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why cannot magnetic class be inferred from resistivity alone?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why is a forbidden gap not a physical empty space in a solid?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why does an N-type semiconductor remain electrically neutral overall?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why is a semiconductor more than merely a weak conductor?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why is chemical stability important outdoors?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• What is the most defensible reason to compare a material's properties under actual service conditions?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why should temperature be specified when comparing resistivity?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• Why does an insulator conduct poorly at room temperature?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• Why is rubber suitable for wire insulation?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• When an electron enters the conduction band, what is left behind?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• A material has a small band gap and intermediate conductivity. It is likely a:

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• Why can a semiconductor conduct more than a typical insulator?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium