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Home ‣ Electronics and Communication Engineering ‣ Materials and Components Comments
  • Question

  • Permeability is analogous to


  • Options
  • A. resistivity
  • B. retentivity
  • C. conductivity
  • D. coercivity

  • Correct Answer
  • conductivity 

    • Materials and Components problems

    Search Results

    • 1. In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be

    • Options
    • A. 0.5 T
    • B. less than 0.5 T
    • C. more than 0.5 T
    • D. 0.5 T or more or less
      • Discuss
    • 2. Nichrome is used for

    • Options
    • A. overhead line wires
    • B. heater coils
    • C. lamp filaments
    • D. all of the above
      • Discuss
    • 3. As per Bohr's postulate, only those circular orbits are stable for which the angular momentum is equal to an integer times .

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. In a rare gas, the molecules of some atoms have an excess positive or negative charge. The electric field tends to shift positive ions relative to negative ions. This is known as ionic polarization.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The temperature coefficient of a thermistor

    • Options
    • A. is positive
    • B. is negative
    • C. zero
    • D. may be positive or negative depending on its composition
      • Discuss
    • 6. The circumference of an electron orbit is equal to integer times the wavelength of electron.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. At a temperature of about 1 K, aluminium is a

    • Options
    • A. conductor
    • B. insulator
    • C. photoconductor
    • D. superconductor
      • Discuss
    • 8. For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to

    • Options
    • A. n A
    • B. (n - 1) A
    • C. (n + 1) A
    • D.
      • Discuss
    • 9. A material has N spins per m3. If Np are the dipoles per m3 parallel to field and Na are the dipoles per m3 anti-parallel to field, the magnetisation is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. The resistivity of intrinsic semiconductors, at room temperature, is of the order of

    • Options
    • A. 1 ?-m
    • B. 1000 ?-m
    • C. 106 ?-m
    • D. 10-3 ?-m
      • Discuss

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