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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

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  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

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  5. The S.I. unit of power is

  6. A.

     Henry

    B.

     Coulomb

    C.

     Watt

    D.

     Watt-hour

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  7. A thermistor has

  8. A.

     Positive temperature coefficient

    B.

     Negative temperature coefficient

    C.

     Zero temperature coefficient

    D.

     Variable temperature coefficient

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  9. All of the following are equivalent to watt except

  10. A.

     (Amperes) ohm

    B.

     Joules/sec.

    C.

     Amperes × volts

    D.

     Amperes/volt

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  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

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  13. Bulbs in street lighting are all connected in

  14. A.

     Parallel

    B.

     Series

    C.

     Series-parallel

    D.

     End-to-end

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  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

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  17. With rise in temperature the resistance of semiconductors

  18. A.

     Decreases

    B.

     Increases

    C.

     First increases and then decreases

    D.

     Remains constant

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  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

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