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Materials and Components problems

  • 1. Automobile ignition systems use the principle of

  • Options
  • A. resistance
  • B. self inductance
  • C. mutual inductance
  • D. capacitance
    • Discuss
  • 2. The materials having low retentivity are suitable for making

  • Options
  • A. temporary smagnets
  • B. weak magnets
  • C. permanent magnets
  • D. both temporary and permanent magnets
    • Discuss
  • 3. The number of valence electrons in germanium atom is

  • Options
  • A. 4
  • B. 2
  • C. 1
  • D. zero
    • Discuss
  • 4. The carrier mobility in a semiconductor is 0.4 m2/Vs. Its diffusion constant at 300 K will be (in m2/s)

  • Options
  • A. 0.40
  • B. 0.16
  • C. 0.04
  • D. 0.01
    • Discuss
  • 5. Lines of magnetic field attract each other.

  • Options
  • A. True
  • B. False
    • Discuss
  • 6. If temperature is increased, the temperature coefficient of a metal

  • Options
  • A. increases
  • B. decreases
  • C. may increase or decrease
  • D. remains constant
    • Discuss
  • 7. In an homogeneous dielectric subjected to an electric field E, the dipole moment per unit volume is ?0(?r - 1) E.

  • Options
  • A. True
  • B. False
    • Discuss
  • 8. The temperature at which some materials become superconductors is called

  • Options
  • A. Transition temperature
  • B. Curie temperature
  • C. Neel temperature
  • D. Onnes temperature
    • Discuss
  • 9. A parallel plate capacitor having C = 200 x 10-12 F has loss dielectric having tan ? = 4 x 10-4. At an ac voltage of f = 106 Hz and peak value 2 V, the dielectric losses are

  • Options
  • A. 10-8 W
  • B. 10-6 W
  • C. 10-4 W
  • D. 10-2 W
    • Discuss
  • 10. When temperature is more than ferromagnetic curie temperature, the behaviour of a ferromagnetic material is similar to that of paramagnetic material.

  • Options
  • A. True
  • B. False
    • Discuss

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