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A.C Fundamentals, Circuits and Circuit Theory - section-1
  1. In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of

    2. A.

     R only
    B.

     L only
    C.

     C only
    D.

     L or C

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  2. Which of the following circuit component opposes the change in the circuit voltage ?

    3. A.

     Inductance
    B.

     Capacitance
    C.

     Conductance
    D.

     Resistance

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  3. For the same peak value, which of the following wave has the least mean value?

    4. A.

     Half wave rectified sine wave
    B.

     Triangular wave
    C.

     Sine wave
    D.

     Square wave

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  4. In a sine wave the slope is constant

    5. A.

     Between 0° and 90°
    B.

     Between 90° and 180°
    C.

     Between 180° and 270°
    D.

     No where

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  5. For the same peak value which of the following wave will 'have the highest r.m.s. value?

    6. A.

     Square wave
    B.

     Half wave rectified sine wave
    C.

     Triangular wave
    D.

     Sine wave

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  6. In a R-L-C circuit

    7. A.

     Power is consumed in resistance and is equal to IR
    B.

     Exchange of power takes place between inductor and supply line
    C.

     Exchange of power takes place between capacitor and supply line
    D.

     All above are correct

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  7. Inductance of coil

    8. A.

     Is unaffected by the supply frequency
    B.

     Decreases with the increase in supply frequency
    C.

     Increases with the increase in supply frequency
    D.

     Becomes zero with the increase in supply frequency

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  8. Power factor of the following circuit will be unity

    9. A.

     Inductance
    B.

     Capacitance
    C.

     Resistance
    D.

     Both A and B

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  9. The voltage of domestic supply is 220 V. This figure represents

    10. A.

     Mean value
    B.

     r.m.s. value
    C.

     Peak value
    D.

     Average value

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  10. A parallel AC. circuit in resonance will

    11. A.

     Have a high voltage developed across each inductive and capacitive section
    B.

     Have a high impedance
    C.

     Act like a resistor of low value
    D.

     Have current in each section equal to the line current

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