Electrical engineering material miscellaneous

Electrical engineering material miscellaneous

Easy Questions

Electrical Engineering materials

Electrical engineering material miscellaneous
  1. High frequency amplifier use transformers with :








  1. View Hint View Answer Discuss in Forum

    High frequency amplifiers use transformers with ferrite core.

    Correct Option: B

    High frequency amplifiers use transformers with ferrite core.

  1. Audio and power amplifiers use transformers with:








  1. View Hint View Answer Discuss in Forum

    Audio and power amplifiers use transformers with laminated iron core.

    Correct Option: A

    Audio and power amplifiers use transformers with laminated iron core.

  1. Eg of a semiconductor:








  1. View Hint View Answer Discuss in Forum

    Eg i.e. band gap of a semiconductor decreases with temperature.

    Correct Option: C

    Eg i.e. band gap of a semiconductor decreases with temperature.

  1. The magnetic susceptibility of paramagnetic material is:








  1. View Hint View Answer Discuss in Forum

    Magnetic susceptibility is given by relation
    χm = µr – 1
    where χm = magnetic susceptibility
    µr = relative permeability
    We know that for a paramagnetic material µr is slightly greater than unity. Therefore, magnetic susceptibility of paramagnetic material is less than one but positive.

    Correct Option: B

    Magnetic susceptibility is given by relation
    χm = µr – 1
    where χm = magnetic susceptibility
    µr = relative permeability
    We know that for a paramagnetic material µr is slightly greater than unity. Therefore, magnetic susceptibility of paramagnetic material is less than one but positive.

  1. Interfacial polarisation of plastics increase their:








  1. View Hint View Answer Discuss in Forum

    Interfacial polarisation of plastic increase their permittivity.

    Correct Option: B

    Interfacial polarisation of plastic increase their permittivity.