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EEE :: RL Circuits

  1. A 1.5 k resistor and a coil with a 2.2 k inductive reactance are in series across an 18 V ac source. The power factor is

  2. A.
    564
    B.
    0.564
    C.
    6.76
    D.
    55.7

  3. The voltages in Problem 5 are measured at a certain frequency. To make the resistor voltage less than the inductor voltage, the frequency is

  4. A.
    increased
    B.
    decreased
    C.
    doubled
    D.
    not a factor

  5. In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is

  6. A.
    18.4 V
    B.
    26.0 V
    C.
    2 V
    D.
    20 V

  7. To increase the current in a series RL circuit, the frequency

  8. A.
    should be increased
    B.
    should be decreased
    C.
    should be constant
    D.
    cannot be determined without values

  9. A 470 resistor and a coil with 125 inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is

  10. A.
    152 mA
    B.
    32 mA
    C.
    12 mA
    D.
    120 mA

  11. A 1.2 k resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is

  12. A.
    152.6
    B.
    1,526
    C.
    1,200
    D.
    942

  13. When the frequency is decreased, the impedance of a parallel RL circuit

  14. A.
    increases
    B.
    decreases
    C.
    remains constant
    D.
    is not a factor

  15. A 470 resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is

  16. A.
    12.60 –76° mS
    B.
    12.1876° mS
    C.
    218 –76° mS
    D.
    12.18 –76° mS

  17. Referring to Problem 23, the reactive power is

  18. A.
    10 mVAR
    B.
    100 mVAR
    C.
    6.76 mVAR
    D.
    148 mVAR

  19. A 12 k resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.30° mA. The source voltage, expressed in polar form, is

  20. A.
    3.8420.6° V
    B.
    12.820.6° V
    C.
    0.320.6° V
    D.
    13.8469.4° V