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  • Question

  • The number of turns in a coil is doubled. If initial time constant is T, the new time constant is


  • Options
  • A. T
  • B. 2T
  • C. 4T
  • D. The number of turns in a coil is doubled. If initial time constant is T, the new time constant is T

  • Correct Answer
  • 2T 

    Explanation
    When N is doubled, resistance becomes twice and inductance becomes four times.

    Since time constant is The number of turns in a coil is doubled. If initial time constant is T, the new time constant is T , time contant become twice.

    Materials and Components problems

    Search Results

    • 1. When temperature is above ferromagnetic Curie temperature, a ferromagnetic material

    • Options
    • A. becomes a paramagnetic material
    • B. becomes a very strong ferromagnetic material
    • C. becomes diamagnetic material
    • D. none of the above
      • Discuss
    • 2. The number of valence electrons in silicon atom is

    • Options
    • A. 4
    • B. 2
    • C. 1
    • D. zero
      • Discuss
    • 3. In which of the following semiconductor are holes minority carriers

    • Options
    • A. extrinsic
    • B. p type
    • C. n type
    • D. intrinsic
      • Discuss
    • 4. Assertion (A): Ionic solids, in general, have no electrical conductivity.

      Reason (R): In ionic solids, electrons are tightly bound to the nucleus.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 5. The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m2) and dT/dx (°C per metre) is

    • Options
    • A. Q = K(dT/dx)
    • B. Q = - K(dT/dx)
    • C. K = Q(dT/dx)
    • D. dT/dx = - QK
      • Discuss
    • 6. ?r is determined by the atomic structure of the dielectric.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. When Schrodinger equation is applied to the motion of electron in the field of protons, the physically acceptable solutions for the wave function exist for quantum number which are

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss
    • 8. If B, H and M denote flux density, field intensity and magnetisation, B = ?0 (H + M).

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. Assertion (A): An amorphous material is obtained when mobility of atoms is inhibited during solidification.

      Reason (R): Crystalline state is a natural state for most solids.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 10. An air cored inductance is a

    • Options
    • A. linear circuit element because its reactance varies linearly with voltage at a fixed frequency
    • B. linear circuit element because its current varies linearly with voltage at a fixed frequency
    • C. nonlinear circuit element due to saturation of core
    • D. nonlinear circuit element because v =
      • Discuss

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