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EEE :: A.C Fundamentals, Circuits and Circuit Theory

  1. When an alternating current passes through an ohmic resistance the electrical power converted into heat is

  2. A.

     Apparent power

    B.

     True power

    C.

     Reactive power

    D.

     None of the above


  3. The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of ________ degrees.

  4. A.

     90

    B.

     60

    C.

     45

    D.

     30


  5. The purpose of a parallel circuit resonance is to magnify

  6. A.

     Current

    B.

     Voltage

    C.

     Power

    D.

     Frequency


  7. The safest value of current the human body can carry for more than 3 second is

  8. A.

     4 mA

    B.

     9 mA

    C.

     15 mA

    D.

     25 mA


  9. In a highly capacitive circuit the

  10. A.

     Apparent power is equal to the actual power

    B.

     Reactive power is more than the apparent power

    C.

     Reactive power is more than the actual power

    D.

     Actual power is more than its reactive power


  11. An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms,

  12. A.

     The current through the resistance is more

    B.

     The current through the resistance is less

    C.

     Both resistance and inductance carry equal currents

    D.

     None of the above


  13. Poor power factor

  14. A.

     Reduces load handling capability of electrical system

    B.

     Results in more power losses in the electrical system

    C.

     Overloads alternators, transformers and distribution lines

    D.

     Results in all above


  15. Form factor for a sine wave is

  16. A.

     1.414

    B.

     0.707

    C.

     1.11

    D.

     0.637


  17. The frequency of domestic power supply in India is

  18. A.

     200 Hz

    B.

     100 Hz

    C.

     60 Hz

    D.

     50 Hz


  19. Pure inductive circuit

  20. A.

     Consumes some power on average

    B.

     Does not take power at all from a line

    C.

     Takes power from the line during some part of the cycle and then returns back to it during other part of the cycle

    D.

     None of the above