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  1. What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?

  2. A.
    4.24
    B.
    3.46
    C.
    2.16
    D.
    21.63

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  3. The complex number 6 + j6 is equivalent to

  4. A.
    645°
    B.
    3645°
    C.
    8.4845°
    D.
    8.4890°

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  5. In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is

  6. A.
    200 mA
    B.
    100 mA
    C.
    282 mA
    D.
    141 mA

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  7. An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:

  8. A.
    R = XC
    B.
    R > XC
    C.
    R < XC
    D.
    R = 5XC

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  9. What is the angular difference between +j4 and –j4?

  10. A.
    30°
    B.
    90°
    C.
    180°
    D.
    270°

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  11. A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k. Current flow in the circuit is

  12. A.
    9.2 mA
    B.
    92 mA
    C.
    4.6 mA
    D.
    460 mA

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  13. For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is

  14. A.
    19.52 W
    B.
    195.2 W
    C.
    275 W
    D.
    25 W

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  15. When the frequency of the voltage applied to a series RC circuit is increased, the phase angle

  16. A.
    increases
    B.
    decreases
    C.
    remains the same
    D.
    becomes erratic

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  17. In a series RC circuit, when the frequency and the resistance are halved, the impedance

  18. A.
    doubles
    B.
    is halved
    C.
    is reduced to one-fourth
    D.
    cannot be determined without values

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  19. A 2 k resistor is in series with a 0.015 F capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?

  20. A.
    73.4 and θ = –19.5°
    B.
    707 and θ = –19.5°
    C.
    2121 and θ = –19.5°
    D.
    734 and θ = –38.9°

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