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    PE Power Sample Exam

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    Pass Rate

    Where did you see?
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    NCEES Results - Michigan

    Passed!!
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    Camara Power Sample Exam Prob.#10

    Irrespective of phases (1-phase or 3-phase), Sqrt(3) should not be part of the equation; answer will be 9 microF. Without investigating, many of us always use sqrt(3) for three phase system, but not the case always like this. In this case, phase to phase or line voltage already accounted, so...
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    NEC problem

    article 110 is for "equipment" not conductors - - Article 490 also for equipment (Equipment, over 600 volts, nominal).
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    NEC problem

    I don't see any clearance distance 15" in 110. Would you please specify the sub-number of article (e.g. 110.xx)?
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    NEC problem

    Both 15" and 18" are minimum distances for BIL 150 (kV)and 200 (kV) respectively.
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    Materials on " Devices and Power Electronic Circuits"

    I am struggling to get good reference materials on "Devices and Power Electronic Circuits". Any thought / advice will be appreciated. Thanks
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    new NCEES #113

    ----------------------------------------------------------------------------- Because, neutral will have one direction for positive half cycle and opposite direction for negative half cycle. Please note that Load (RLoad) current direction will note change (always same direction). Thanks
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    NCEES 113, 114, 115

    114. Simply inverter will supply power to motor and it maximum voltage (value) will be Vdc which is 679 V. Here transistor is nothing but switch. 115. Current waveform is given, so integrating between staring point to end point ( 45 deg & 180 deg) and diving by time ( or in terms of radian...
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    NCEES Problem 109

    If wye-connected source is grounded, is there any difference to determine VBG? Thanks,
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    NCEES #111

    In practice, when power is supplied to a load, connection arrangement may not known. It can be treated as you are supplying power to a black box, so questions of wye or delta have no importance anymore. In that case any connection arrangement can be solved as Y connection considering a virtual...
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    NCEES #111

    When they convert the load voltage VAB to Van, what relationship causes it to be shifted by -30 degrees? ---------------------------------------------------------------------------------------------------------------------------------------------------- In balanced three phase system Van, Vbn...
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    NCEES #518

    "Power Electronics by Muhammad H. Rashid" and "Power Electronics by Ned Mohan" are good sources of reference materials. Thanks
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    NCEES #518

    VAve/dc= [3*Sqrt(3)/pi]*Vm (by integration) = [3*Sqrt(3)/pi]*(sqrt(2)(Vrms)); Here Vrms for line to neutral = [3*Sqrt(2)/pi]*(sqrt(3)(Vrms)) =1.35 VLL Note: Ques 518 (battery charger) is not related to this relation rather concern with Vmax. Thanks
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