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

• How can microscopic structure affect macroscopic performance?

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

• Which property combination suits a high-voltage support insulator?

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

• Why do intrinsic semiconductors have equal electron and hole concentrations at equilibrium?

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

• Why can a small dopant concentration strongly affect semiconductor conductivity?

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

• A material's conductivity increases strongly on heating. Which semiconductor mechanism can explain this?

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

• A component carries current, dissipates heat and experiences vibration. Best selection method?

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

• A low-resistivity material oxidises rapidly outdoors. What is a sound engineering conclusion?

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

• What is the most complete meaning of material characteristics in engineering selection?

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

• What happens when electrons gain enough energy to enter a semiconductor's conduction band?

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

• For a given material state, conductivity and resistivity are:

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

• Why can two materials with similar composition but different crystal structures have different properties?

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

• Why state temperature when comparing resistivity values?

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

• A solid has a partially filled allowed band at the Fermi level. What behaviour is indicated?

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

• What distinguishes atomic number from mass number?

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

• Why may a material with high conductivity still be unsuitable for a specific component?

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

• Which description of intrinsic semiconductor is correct?

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

• Two atoms have the same atomic number but different mass numbers. They are:

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

• Why are material classifications not always mutually exclusive?

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

• Why classify materials using both atomic structure and energy bands?

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

• Why do outer electrons influence bonding more than tightly bound inner electrons?

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