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 is nitrogen sometimes used as an insulating gas in electrical equipment?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Medium

• Which property makes dry air suitable as an insulating medium in overhead transmission lines?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Medium

• If an insulating system is operated continuously above its rated thermal limit, what is the most likely result?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Medium

• Which insulation class has a nominal maximum temperature of 155°C?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Medium

• Why is the thermal class of an electrical insulating system important when selecting insulation for a motor?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Medium

• Which material has traditionally been used as an insulating support in electrical installations?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• What is the main purpose of enamel on winding wires?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Insulating varnish is applied to electrical machine windings mainly to?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Silicone grease is commonly applied to electrical components to help?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• PTFE is valued as an electrical insulating material because of its?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Which insulating material is also known by the trade name Teflon?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Bitumen has been used in electrical engineering mainly for?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Rubber is commonly used in electrical engineering for?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Which type of paper is commonly used in oil-filled power transformers as part of winding insulation?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Why is insulating paper impregnated with insulating oil in some electrical applications?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Jute is classified as which type of material in its natural form?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Silk has been used in electrical engineering mainly as?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Which of the following is a natural fibrous insulating material?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Glass is used in electrical engineering as an insulating material because it generally has?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy

• Steatite is a type of?

  Electrical Engineering Materials › Unit 3: Insulating Materials · Easy