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EEE :: Current Electricity

  1. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals

  2. A.

     10 W

    B.

     20 W

    C.

     40 W

    D.

     60 W

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  3. The insulation on a current carrying conductor is provided

  4. A.

     To prevent leakage of current

    B.

     To prevent shock

    C.

     Both of above factors

    D.

     None of above factors

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  5. Out of the following which is not a poor conductor?

  6. A.

     Cast iron

    B.

     Copper

    C.

     Carbon

    D.

     Tungsten

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  7. When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will

  8. A.

     Decrease

    B.

     Increase

    C.

     Remain constant

    D.

     None of the above

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  9. Which of the following statement is true both for a series and a parallel D.C. circuit?

  10. A.

     Elements have individual currents

    B.

     Currents are additive

    C.

     Voltages are additive

    D.

     Power are additive

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  11. Voltage dependent resistors are usually made from

  12. A.

     Charcoal

    B.

     Silicon carbide

    C.

     Nichrome

    D.

     Graphite

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  13. The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around

  14. A.

     1.2 x 10-8 ω-m

    B.

     1.4 x 10-8 ω-m

    C.

     1.6 x 10-8 ω-m

    D.

     1.8 x 10-8 ω-m

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  15. The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is

  16. A.

     50 %

    B.

     60 %

    C.

     100 %

    D.

     150 %

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  17. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is

  18. A.

     33 V

    B.

     66 V

    C.

     80 V

    D.

     132 V

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  19. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

  20. A.

     0.4 ohm

    B.

     0.6 ohm

    C.

     0.8 ohm

    D.

     1.0 ohm

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