# Pe power electrical engineering sample exam 13 35

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PE Power Electrical Engineering Sample Exam1335.Figure 35 shows a synchronous generator connected to a synchronousmotor by a transmission line. Base values are 10 MVA, 12 kV.The motor voltage, VM, is 1 pu and the current, IM, is 1.1 pu at a leadingpower factor of 0.8. A symmetrical three-phase fault occurs at the terminalsof the motor. The contribution of the fault current from the generator in kAis nearly:a.1.92b.1.03c.0.78d.0.39
36.Consider this set of unbalanced, three-phase currents:/ = 125 Z50° amps/”=95 Z10° amps/ = 150 Z-110° ampsI, the positive-sequence component, is nearly:
37.Positive-sequence and negative-sequence components of the line-to-linevoltage of a wye-connected load, V b are specified as 115Z-15° and30Z1050, respectively. The phase voltage |V| is nearly:
38.The positive-, negative-, and zero-sequence reactances of a 40 MVA, 20kV synchronous generator are 0.45 pu, 0.25 pu, and 0.10 pu, respectively.The generator is solidly grounded and is not loaded when a line-to-ground fault occurs on phasea.(Neglect all the resistances.) The faultcurrent I in kA is nearly:
14Chapter 1Morning Exam Questions39.The positive-, negative-, and zero-sequence reactances of a 40 MVA,20 kV synchronous generator are 0.45 pu, 0.25 pu, and 0.10 pu, respec-tively. The generator is solidly grounded and is not loaded when a line-to-line fault occurs between phasesbandc.(Neglect all the resistances.)Fault current in kA is nearly:a.b.1.27c.2.86d.3.470
40.The positive-, negative-, and zero-sequence reactances of a 40 MVA, 20kV synchronous generator are 0.45 pu, 0.25 pu, and 0.10 pu, respectively.The generator is solidly grounded and is not loaded. Neglect all the resis-tances. A double line-to-ground fault occurs between linesbandcandground. Fault current (in pu) is nearly:
CHAPTERAfternoon ExamQuestions1.A systems application involves a multiwinding transformer as modeled inFigure 1.Figure 1Vs= 20 volts,Rs= 50 ohms,N l= 100R2 =200 ohms,N2 =200R3 =300 ohms,N3 =Assuming an ideal transformer, the value of /, is nearly:300

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Term
Winter
Professor
professor_unknown
Tags
Electric power transmission, Electric power, Professional Engineer, NCEES