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A.C Fundamentals, Circuits and Circuit Theory - section-1
  1. In a three-phase supply floating neutral is undesirable because it way give rise to

    2. A.

     High voltage across the load
    B.

     Low voltage across the load
    C.

     Unequal line voltages across the load
    D.

     None of these

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  2. Power factor of electric bulb is

    3. A.

     Zero
    B.

     Lagging
    C.

     Leading
    D.

     Unity

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  3. If two sine waves of the same frequency have a phase difference of JT radians, then

    4. A.

     Both will reach their minimum values at the same instant
    B.

     Both will reach their maximum values at the same instant
    C.

     When one wave reaches its maxi¬mum value, the other will reach its minimum value
    D.

     None of the above

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  4. The power factor at resonance in R-L-C parallel circuit is

    5. A.

     Zero
    B.

     0.08 lagging
    C.

     0.8 leading
    D.

     Unity

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  5. The period of a wave is

    6. A.

     The same as frequency
    B.

     Time required to complete one cycle
    C.

     Expressed in amperes
    D.

     None of the above

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  6. Which of the following coil will have large resonant frequency?

    7. A.

     A coil with large resistance
    B.

     A coil with low resistance
    C.

     A coil with large distributed capacitance
    D.

     A coil with low distributed capacitance

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  7. The r.m.s. value and mean value is the same in the case of

    8. A.

     Triangular wave
    B.

     Sine wave
    C.

     Square wave
    D.

     Half wave rectified sine wave

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  8. Power factor of the system is kept high

    9. A.

     To reduce line losses
    B.

     To maximize the utilization of the capacities of generators, lines and transformers
    C.

     To reduce voltage regulation of the line
    D.

     Due to all above reasons

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  9. For a sine wave with peak value Imax the r.m.s. value is

    10. A.

     0.5 Imax
    B.

     0.707
    C.

     0.9
    D.

     1.414 Imax

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  10. For a frequency of 200 Hz, the time period will be

    11. A.

     0.05 s
    B.

     0.005 s
    C.

     0.0005 s
    D.

     0.5 s

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