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1、西交电力系统分析在线作业（I analyze online homework power system West）West turn power system analysis I online homeworkTotal score: 100 test time: -Radio examinationA multiple-choice questionRadio examination questions (40 questions, 80 points)1. in power flow calculation, the number of PV nodes is ().A., Q, Del
2、taB., P, QC., V, DeltaD., P, VFull marks: 22. at any load, the voltage at the central point is maintained at approximately constant value (102% - 105%UN). This mode of voltage regulation is ().A. in tuneB. constant pressure regulationC. inversionD. CIS and transFull marks: 23. in the high-voltage ov
3、erhead transmission line between 1 points and 2 points, the voltage amplitude U1 is greater than U2, the voltage phase angle 1 is less than the angle 2, and the active flow of the line is most likely to flow ().A. flows from 1 to 2B. flows from 1 to the earthC. flows from 2 to 1D. flows from 2 to th
4、e earthFull marks: 24., it is known that a node carries loads, the active power is P, and the apparent power is S, then the power factor angle is ().A. arcctgP/SB. arcsinP/SC. arctgP/SD. arccosFull marks: 25. the tidal current equation is ().A. system of linear equationsB. differential equationsC. l
5、inear equationD. nonlinear equationsFull marks: 26. following the advantages of the wire splitting technique for AC transmission lines, the error is ().A. reduces corona lossesB. reduction of line series reactanceC. reduces the number of lines in parallel to reduce line acceptance in seriesFull mark
6、s: 27. there are alternate wiring modes.A. radiation, ring, chainB. radiation, trunk, chainC. ring type and double terminal power supply typeD., B, and CFull marks: 28. compared with overhead transmission lines, the reactance of the same section cable.A.Small B.C. equalityD. is wrongFull marks: 2Whe
7、n the single-phase grounding occurs in the 9. neutral ungrounded system, the current flows through the grounding point, and the current path is ().A. transformer, transmission lineB. generatorC. transmission line, neutral pointCapacitance of D. transmission line and line to groundFull marks: 210. th
8、e advantages and disadvantages of the standby power connection are: ().A. has high reliability and high voltageB. has high reliability and low costC. has high reliability and high costD. has low reliability and high costFull marks: 211. in the equivalent parameter of the double torsion transformer,
9、if the transformer rating is the reference value, the value of the short-circuit loss is equal to that of the numerical value.What is the value of the A. series impedance?The nominal value of B. series reactanceWhat is the value of the C. excitation conductance?The value of the D. excitation chargeF
10、ull marks: 212. in power system analysis, the units of active power are commonly used.A. VARB. MWC. MVAD. VFull marks: 213. clockwise means .A. peak load, the voltage is raised, the trough load, the voltage is loweredWhen the peak load is B., the allowable voltage is low and the allowable voltage is
11、 high when the trough load is lowC. peak load, low load, high voltageD. peak load, trough load, voltage downFull marks: 214. power system, the first level load, two stage load and three stage load is divided according to the users power supply.A. reliability requirementsB. economic requirementsC. fl
12、exibility requirementsD. quality requirementsFull marks: 215., reactive power shortage in the system will cause ().A. frequency riseB. frequency dropC. voltage riseD. voltage dropFull marks: 216. in the equivalent parameter of the double torsion transformer, if the transformer rating is the referenc
13、e value, the value of the no-load current is equal to the value.What is the value of the A. series impedance?The nominal value of B. series reactanceWhat is the value of the C. excitation conductance?The value of the D. excitation chargeFull marks: 2The 17. P- sigma curve is called ().A. consumption
14、 characteristic curveB. load curveC. sinusoidal voltage curveD. power angle curveFull marks: 218. in the following wiring modes of an electric power system, there is a standby connection.A. terminal power supply networkB. single loop trunk typeC. single loop radiation wiringD. single circuit chain c
15、onnectionFull marks: 219. Newton Raphson method for power flow iterative calculation, the correction equation is solved.A. line powerB. node injection powerNew value of C. node voltageVoltage correction of D. nodeFull marks: 220. the rated frequency of power system in our country is ().A. 30HZB. 40H
16、ZC. 50HZD.60HZFull marks: 221. in the calculation of the unitary value of the steady-state analysis of power systems, usually () is the predetermined reference value.A. voltage and currentB. voltage and impedanceC. voltage and powerD. power and impedanceFull marks: 222. which capacity may not be nee
17、ded in the reserve capacity of the system?.A. load reserveB. national economy reserveC. accident reserveD. spare parts for repair and maintenanceFull marks: 2When the 23. hand calculates the tidal current, the line on the substation bus is incorporated into the equivalent load power of half of the e
18、arth electricity, and this power is called ().A. operation load powerPower supply for B. operationC. equivalent load powerD. equivalent power supplyFull marks: 224. minimum load, the central point of the voltage is reduced (100%UN), the maximum load voltage will be central point (105%UN), this point
19、 of central pressure regulation mode is ().A. CIS regulationB. constant voltage regulationC. reverse voltage regulationD. constant pressure regulationFull marks: 225., the lack of active power in the system will inevitably result in ().A. frequency riseB. frequency dropC. voltage riseD. voltage drop
20、Full marks: 226., using P - Q decomposition method and Newton Raphson for power flow calculation, the convergence speed of the two is ().A. P - Q decomposition method is higher than Newton - Raphson methodB. cannot compareC. Newton Raphson method is higher than P - Q decomposition methodD. the two m
21、ethods are the sameFull marks: 2The operation mode of grounding of 27. neutral point through arc suppression coil is generally used in practice.A. under compensationB. over compensationC. full compensationD. constant compensationFull marks: 228., the combined power supply load of the power system pl
22、us the sum of the factory power consumption is called ().A. generation loadB. power supply loadC. electrical loadD. industrial loadFull marks: 229. the principle of optimal allocation of active power load in power system is ().A. equal area principleB. equal torque principleC. equal load principleD.
23、 consumption incremental principleFull marks: 230. a transformer connects the two power network and its rated voltage is 121/220, then it is () a transformer.A. boostB. step-downC. adjustableNeither D.Full marks: 231. the active power supply of the power system is ().A. generatorB. transformerC. cam
24、eraD. capacitorFull marks: 232. the active power in the equivalent parameter of the power line is ().A. resistanceB. inductanceC. electro acceptanceD. capacitorFull marks: 233. about the node admittance matrix Y, the following statement is wrong.A. complex squareB. must have its corresponding impeda
25、nce matrixC. is a sparse matrixD. contains both component constraints and network topology constraintsFull marks: 2Compared with the negative sequence impedance, the positive sequence impedance of the 34. transmission line needs its value.A.Small B.C. equalityNeither D.Full marks: 235. in the high-v
26、oltage overhead transmission line between 1 points and 2 points, the voltage amplitude U1 is greater than U2, the voltage phase angle 1 is less than the angle 2, and the reactive flow of the line is most likely to flow to ().A. flows from 1 to 2B. flows from 1 to the earthC. flows from 2 to 1D. flow
27、s from 2 to the earthFull marks: 236., reducing the active loss of transmission lines can be achieved by means of.A. increases the active power of the lineB. increase reactive power of lineC. improves the voltage across the lineIncreasing the resistance of transmission line by D.Full marks: 237. in
28、the power flow computer solution, the Error statement about the PQ decomposition method is compared with the N R method.The convergence of A. is poorB. computing speed is fasterThe number of C. iterations is moreThe convergence accuracy of D. is poorFull marks: 238. the rated voltage level of power
29、system in our country has ().A. 115, 220, 500 (KV)B. 110, 230, 500 (KV)C. 115, 230, 525 (KV)D. 110, 220, 500 (KV)Full marks: 239. the frequency of the power system is mainly concerned with.A. reactive powerB. circuit voltageC. active powerD. circuit currentFull marks: 240. the geographical connectio
30、n of power users to obtain electrical energy from only one power source is ().A. dual loop radiationB. power supply at both endsC. has a spare connectionD. no spare wiringFull marks: 2West turn power system analysis I online homeworkTotal score: 100 test time: -Radio examinationA multiple-choice que
31、stion, (a total of 10 multiple-choice questions, a total of 20 points.)OneThe basic requirement of power system operation is ()A. reliabilityB. qualityC. economyD. diversityFull marks: 22. what are the main components of an electric network?.A. power lineB. transformerC. power usersD. insulated wire
32、Full marks: 23. in the electric power system, reserve capacity can be divided into (or) in the form of existenceA. hot standbyB. cold standbyC. multi standbyD. mixed standbyFull marks: 24. in power flow calculation, nodes are often divided into ().A.PQ nodeB.PV nodeC.V theta nodeD. P 0Full marks: 2T
33、he electrical parameters of 5. transmission lines are ().A. resistanceB. reactanceC. conductanceD. electro acceptanceFull marks: 26. in the power flow calculation, the physical quantity that the PQ node needs is the nodes ().A. voltage amplitudeB. currentC. voltage meanD. voltage phaseFull marks: 27
34、., compared with other industrial products, the production, transmission, distribution and consumption of electric energy have () characteristics.A. economyB. importanceC. rapidityD. simultaneityFull marks: 28. The network rating voltage class (10 thousand volts and above) specified in the national
35、standard of our country.A.10B.35C.100D.110Full marks: 29. power system voltage adjustment can be used () measuresA. generator voltage regulationB. transformer voltage regulationC. parallel compensation voltage regulationD. series compensation voltage regulationFull marks: 210. power quality refers to ()A. temperature qualityB. voltage qualityC. waveform qualityD. frequency qualityFull marks: 2This article reprinted from the free operating answer Download Network www.Vu80. com more full marks free answer