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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


  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


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

  6. A.

     Cast iron

    B.

     Copper

    C.

     Carbon

    D.

     Tungsten


  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


  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


  11. Voltage dependent resistors are usually made from

  12. A.

     Charcoal

    B.

     Silicon carbide

    C.

     Nichrome

    D.

     Graphite


  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


  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 %


  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


  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