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  • Question

  • Which of the following is used in lightning arresters?


  • Options
  • A. Thermistor
  • B. Photoconductor
  • C. Transistor
  • D. Varistor

  • Correct Answer
  • Varistor 

    • Materials and Components problems

    Search Results

    • 1. 1 Bohr magneton = .

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. A circular sphere mile is the area of cross-section of a wire

    • Options
    • A. having a diameter equal to 1 miles
    • B. having a radius equal to 1 miles
    • C. having a circumference equal to 1 miles
    • D. none of the above
      • Discuss
    • 3. The dielectrics having only one kind of atoms are known as elemental dielectrics.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. An electron (charge -e) is rotating in a circular orbit of radius R, around a proton with charge +e at a constant angular velocity ?. The orbital magnetic dipole moment is

    • Options
    • A. 0.5 e? R2
    • B. e? R2
    • C. 2 e? R2
    • D. 0.5 e? R3
      • Discuss
    • 5. Electric dipole moment is usually expressed in debye units. Here, 1 debye unit equals

    • Options
    • A. 3.33 x 10-30 C-m
    • B. 3.33 x 10-30 C-m2
    • C. 3.30 x 10-10 C-m
    • D. 3.33 x 10-10 C-m2
      • Discuss
    • 6. In its lowest state, the electron is bound to the field of proton by an energy equal to

    • Options
    • A. 100.5 eV
    • B. 51.2 eV
    • C. 13.6 eV
    • D. 0.2 eV
      • Discuss
    • 7. As regards ferromagnetic Curie temperature Qf and paramagnetic curie temperature ?

    • Options
    • A. Qf > ?
    • B. ? > Qf
    • C. ? equal to or less than Qf
    • D. ? may be equal to less than or more Qf
      • Discuss
    • 8. In a ferromagnetic material, the internal field seen by a dipole is

    • Options
    • A. equal to applied field
    • B. equal to applied field minus a contribution from neighbouring dipoles
    • C. equal to applied field plus a contribution from neighbouring dipoles
    • D. equal to or less than applied field
      • Discuss
    • 9. In which of the following semiconductor are holes majority carriers

    • Options
    • A. intrinsic
    • B. extrinsic
    • C. p type
    • D. n type
      • Discuss
    • 10. The law that (where K is thermal conductivity, ? is electrical conductivity and T is absolute temperature) for all metals is equal to a universal constant is known as

    • Options
    • A. Lorentz law
    • B. Wiedemann Franz law
    • C. Curie Weiss law
    • D. Kittel law
      • Discuss

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