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  • Question

  • Sulphur hexafluoride is used in


  • Options
  • A. transformers
  • B. generators
  • C. relays
  • D. circuit breakers

  • Correct Answer
  • circuit breakers 

    Explanation
    Sulphur hexafluoride is used in circuit breakers for arc quenching and insulation.

    Materials and Components problems

    Search Results

    • 1. Iron has a body centred cubic structure.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. When an electron moves at velocity v in combined electric and magnetic fields E and H, the Lorentz force F is F = - e(E + v x B).

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. A sample of N type semiconductor has an electron density of 6.25 x 1018/cm3 at 300 K. If intrinsic concentration of carriers in this sample is 2.5 x 1013/cm3 at this temperature, the hole density is

    • Options
    • A. 106 / cm3
    • B. 108 / cm3
    • C. 1010 / cm3
    • D. 1012 / cm3
      • Discuss
    • 4. The induced magnetic dipole moment has a direction opposite to the applied magnetic field.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Hysteresis curve is associated with motion of domain walls.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. A rare gas has N atoms per m3. If electronic polarizability of single atom of this gas is ae, then

    • Options
    • A. ?r = Nae
    • B. ?0?r = Nae
    • C. ?0(?r - 1) = Nae
    • D. ?0(?r - 2) = Nae
      • Discuss
    • 7. M = (?r - 1)H.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A parallel plate capacitor has area of plate equal to 1 m and distance between plates is also 1 m2. The lossy dielectric has a complex dielectric constant ?r = ?'r - j ?"r. If the capacitor is represented by R and C is parallel, then

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 9. Which of the following is used in temperature alarm circuits?

    • Options
    • A. Thermistor
    • B. Photoconductor
    • C. Transistor
    • D. Varistor
      • Discuss
    • 10. The v-i characteristic shown in the given figure is for

    • Options
    • A. thermistor
    • B. photoconductor
    • C. varistor
    • D. none of the above
      • Discuss

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