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Materials and Components problems

  • 1. 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
  • 2. 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
  • 3. As per Bohr's postulate, only those circular orbits are stable for which the angular momentum is equal to an integer times Electronics and Communication Engineering Materials and Components: As per Bohr's postulate, only those circular orbits are stable for which the angular momentum is equ.

  • Options
  • A. True
  • B. False
    • Discuss
  • 4. Nichrome is used for

  • Options
  • A. overhead line wires
  • B. heater coils
  • C. lamp filaments
  • D. all of the above
    • Discuss
  • 5. 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
  • 6. Permeability is analogous to

  • Options
  • A. resistivity
  • B. retentivity
  • C. conductivity
  • D. coercivity
    • Discuss
  • 7. The circumference of an electron orbit is equal to integer times the wavelength of electron.

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

  • Options
  • A. conductor
  • B. insulator
  • C. photoconductor
  • D. superconductor
    • Discuss
  • 9. 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
  • 10. 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

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