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EEE :: Electrostatics

  1. Which medium has the least dielectric strength ?

  2. A.

     Paraffin wax

    B.

     Quartz

    C.

     Glass

    D.

     Air


  3. The minimum value of potential gradient in a cable occurs in

  4. A.

     insulation

    B.

     conductor

    C.

     outer sheath

    D.

     uniformly all over


  5. Dielectric strength ______ with increasing thickness

  6. A.

     increases

    B.

     decreases

    C.

     remains unaltered

    D.

     none of the above


  7. capacitors are mainly used for radio frequency tuning.

  8. A.

     Paper

    B.

     Air

    C.

     Mica

    D.

     Electrolytic


  9. If a third equal and similar charge is placed between two equal and similar charges, then this third charge will

  10. A.

     move out of the field of influence of the two charges

    B.

     remain in stable equilibrium

    C.

     not be in equilibrium

    D.

     be in unstable equilibrium


  11. The unit of capacitance is

  12. A.

     henry

    B.

     ohm

    C.

     farad

    D.

     farad/m


  13. The time constant and R-C circuit may also be defined as the time during which the charging current falls to ______ percent of its initial maximum value,

  14. A.

     37

    B.

     42

    C.

     63

    D.

     73


  15. An electrolytic capacitor can be used for

  16. A.

     D.C. only

    B.

     AC. only

    C.

     both D.C. as well as A.C.

    D.

     none of the above


  17. A capacitor consists of two

  18. A.

     Ceramic plates and one mica disc

    B.

     Insulators separated by a dielectric

    C.

     Silver-coated insulators

    D.

     Conductors separated by an insulator


  19. A paper capacitor is usually available in the form of

  20. A.

     tubes

    B.

     rolled foil

    C.

     disc

    D.

     meshed plates