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  • Question

  • Which of the following is used in temperature alarm circuits?


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

  • Correct Answer
  • Thermistor 

    • Materials and Components problems

    Search Results

    • 1. 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
    • 2. M = (?r - 1)H.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. 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
    • 4. Sulphur hexafluoride is used in

    • Options
    • A. transformers
    • B. generators
    • C. relays
    • D. circuit breakers
      • Discuss
    • 5. Iron has a body centred cubic structure.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The v-i characteristic shown in the given figure is for

    • Options
    • A. thermistor
    • B. photoconductor
    • C. varistor
    • D. none of the above
      • Discuss
    • 7. The Ohm's law for conduction in metals is

    • Options
    • A. J = ?E
    • B. J =
    • C. J ? ?E
    • D. J ?
      • Discuss
    • 8. Soft iron is suitable for making temporary magnets.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. A specimen of metal has n valence electrons per m3. If vx is the average velocity of these electrons, each having a charge e, the current density J is

    • Options
    • A. J = ne vx
    • B. J = - ne vx
    • C. J =
    • D. J =
      • Discuss
    • 10. A metal has a large number of free electrons. If e is electronic charge and m is mass of electron and an electric field E is applied along (say) x direction, the electrons acquire a velocity having a component vx is x direction. Then

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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