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.

15 questions

• In an ACSR overhead conductor, what is the main purpose of the steel core?

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Compared with copper, aluminium generally has:

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Why is aluminium widely used for overhead electrical conductors?

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Annealing hard-drawn copper generally makes it:

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Why is annealed copper suitable for winding wires that must be bent during manufacture?

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Compared with annealed copper, hard-drawn copper generally has greater:

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Silver is useful in electrical contacts primarily because it has:

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Why is gold often used as a surface material for electrical contacts?

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Which metal has the highest electrical conductivity among the commonly used metals listed below?

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• For resistors of equal dimensions carrying the same current, which material generally produces more resistive heating?

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Which alloy is commonly used for precision resistors because it has relatively high resistivity and a low temperature coefficient of resistance?

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Which high-resistivity alloy is commonly used in electric heating elements?

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Using a low-resistivity conductor in a busbar mainly helps reduce:

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• For conductors of equal length and cross-sectional area, a material with lower resistivity will have:

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy

• Which group contains only commonly used low-resistivity conducting materials?

  Electrical Engineering Materials › Unit II: Conducting and Semi-Conducting Materials · Easy