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EEE :: Current Electricity

  1. Nichrome wire is an alloy of

  2. A.

     Lead and zinc

    B.

     Chromium and vanadium

    C.

     Nickel and chromium

    D.

     Copper and silver


  3. Resistance of 220 V, 100 W lamp will be

  4. A.

     4.84 Q

    B.

     48.4 Q

    C.

     484 ft

    D.

     4840 Q


  5. The S.I. unit of power is

  6. A.

     Henry

    B.

     Coulomb

    C.

     Watt

    D.

     Watt-hour


  7. A thermistor has

  8. A.

     Positive temperature coefficient

    B.

     Negative temperature coefficient

    C.

     Zero temperature coefficient

    D.

     Variable temperature coefficient


  9. All of the following are equivalent to watt except

  10. A.

     (Amperes) ohm

    B.

     Joules/sec.

    C.

     Amperes × volts

    D.

     Amperes/volt


  11. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes

  12. A.

     1/9 times

    B.

     3 times

    C.

     9 times

    D.

     Unchanged


  13. Bulbs in street lighting are all connected in

  14. A.

     Parallel

    B.

     Series

    C.

     Series-parallel

    D.

     End-to-end


  15. An electric filament bulb can be worked from

  16. A.

     D.C. supply only

    B.

     A.C. supply only

    C.

     Battery supply only

    D.

     All above


  17. With rise in temperature the resistance of semiconductors

  18. A.

     Decreases

    B.

     Increases

    C.

     First increases and then decreases

    D.

     Remains constant


  19. When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is

  20. A.

     1 n-mho

    B.

     106 mho

    C.

     1 milli-mho

    D.

     None of the above