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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...

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

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

Both 15" and 18" are minimum distances for BIL 150 (kV)and 200 (kV) respectively.

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

----------------------------------------------------------------------------- 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

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...

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

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...

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...

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

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

How the relationship "Vavg = 1.35X line voltage" is derived mathematically? Any explanation will be appreciated - - Thanks

NCEES sample questions only comparable to actual exam in terms of level of difficulties and style of problem (not CI, Spin-up, PPI sample or practice tests). Even I feel actual test is more difficult than sample one.

One way to understand: var1= V1^2/Xc and var2= V2^2/Xc, so new var2= (V2/V1)^2 x var1 Another way consider as base change problem: KVARnew= KVARgiven (Vnew/Vgiven)^2= (110)x(208/240)^2=82.62 KVAR Thanks

540: Power factor of 0.85 along with Xd' is given for Generator. I was not sure if we should use that to find generator Z pu and then add that to transformer by assuming same X/R for both transformer and generator. Presently we are directly adding Xd' pu with transformer Z (ofcourse on common...

510 - If in question has any concern or comments about motor starting current or minimum load to serve, then have to validate setting or overload device size. If validation produce negative result, you should consider 430.32 ©, otherwise not. Thanks,