Numerade

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Question 3 A four-bus power system is shown in Figure 3. Bus 1 is a slack bus the other buses are PQ and PV buses. The initial voltages of the slack bus 1.05 p.u. The data for the buses are given in the Table 1 below. The values of the real and reactive power shown in the table are on a base of 10 MVA. The line impedances in per unit and real and reactive power in per unit are on a common base. Assume the initial value of all the voltages at buses 2, 3 and 4 to be 1.0L0°. Bus No. | V (pu) | $\delta$ (deg.) | Generation | Load | Type | | | | MW | MVAR | MW | MVAR | 1 | 1.05 | 0.0 | | | 0 | 0 | Swing 2 | | | 0.0 | 0.0 | 3 | 3 | Load 3 | | | 0.0 | 0.0 | 2 | 2.5 | Load 4 | 1.05 | | 10 | | 1 | 1.5 | Gen Figure 3 Choose the line impedances for your calculations based on the last digit of your student number as indicated in the following table: Last Digit of Your Student Number | $Z_{12} = Z_{34}$ | $Z_{14} = Z_{24}$ | $Z_{23}$ 0 - 3 | $0.03 + j0.16$ | $0.04 + j0.18$ | $0.06 + j0.38$ 4 - 6 | $0.04 + j0.18$ | $0.02 + j0.2$ | $0.08 + j0.4$ 7 - 9 | $0.05 + j0.20$ | $0.03 + j0.22$ | $0.1 + j0.42$ (a) Create the circuit, in "PowerWorld" software. Assume a base power of 10 MVA and base voltage of 22 kV. All the field values such as voltage and phase angle at every bus and real and reactive power at both end of every line must be included in the circuit. The created circuit diagram (before simulation) must be included in your report. (b) Simulate the circuit using Gauss-Seidel iterative method for a single iteration. Record the values of the voltage magnitudes in pu and phase angle in degrees at buses 2,3 and 4. The simulated diagram with all the field values clearly shown must be included in your report. (c) Calculate the bus admittance matrix for the circuit using the impedance values given in the table. Printout the bus admittance matrix generated by the PowerWorld program and compare it with the bus admittance matrix calculated by you. (d) Calculate the voltage in pu and the phase angle in degrees at the buses 2 and 3 after the first iteration using Gauss-Seidel method and compare it with the results recorded in part (b). (40 marks) The End Page 4 of 5 Page 5 of 5

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Use logarithmic differentiation to find the derivative of y with respect to the given independent variable. iy=\sqrt(((x+1)^(10))/((2x+1)^(5))) iiy=\root(3)((x(x-2))/(x^(2)+1))

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financial distress phase of the Business cycle involves more money in the form of credit is made available by the financial system some trigger/catalyst initiates, a massive sellout and a fallen prices. External shock act new technology triggers, profit opportunities in some economic sectors significant selling by insiders fraud is being revealed more investors become overconfident and over optimistic.

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Pool Sweeper North Star Hurricane Blue Lagoon Clean Sweep Table 25.2 Output (revenue) $ 20,000 $ 16,000 $ 2,000 $ 2,000 Market Share (%) The above data shows annual revenues earned by the only 4 firms in a local commercial cleaning service market. What is the market share of the market leader? Multiple Choice 50 percent 10 percent

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The _____ dns servers constitute the top level of the dns hierarchy.

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Fill in the Blanks: Fill in the blanks with key vocabulary on the structure of viruses (NO WORD BANK) (97) A ______ is a protein coat that surrounds the genome of a virus. It is composed of protein subunits called (98) ______. There are two general types of viruses based on composition. (99) ______ viruses have a phospholipid bilayer which is a small portion of phospholipid membrane obtained as the virion buds from a (100) ______ cell. In contrast, (101) ______ viruses have no phospholipid bilayer. (102) ______ are protein structures that extend outward and away from the capsid on some viruses. They allow the virus to attach specifically to a (103) ______ on the surface of the host cell. The shape of a virus can be helical, icosahedral or complex. Label the Figure: 104.) A ______ 105.) B ______ 106.) C ______ 107.) D ______

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d. Mineral Bluf prepaid a two full years' insurance on April 1 of the current year, $4,800. Record insurance expense for the year ended December 31. (When the policy was purchased on April 1, assume that Mineral Bluf debited an asset account.) Date Accounts and Explanation Debit Credit (d) Dec. 31 Insurance Expense 2400 Prepaid Insurance 2400 To record insurance expense.

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Sample Output: Your Name, Week 4 Database PA All Addresses in the Database Address 1: 123 Apple Tree Ln Fremont, NC 23145 Address 2: 321 Labrador Dr Apt 5 Greenville, VA 54321 Address 3: 916 Spring Grove St Unit 3 Spring, TX 73915 Address 4: 739 Green Way Flynt, MI 28537 Get an Address Using an Invalid ID Address -1: , -1 Updated Address Address 2: 321 Labrador St Apt 12 Greendale, TN 20194 All Addresses in the Database Address 1: 123 Apple Tree Ln Fremont, NC 23145 Address 3: 916 Spring Grove St Unit 3 Spring, TX 73915 Address 4: 739 Green Way Flynt, MI 28537

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Penicillin is an antibiotic that inhibits enzymes from catalyzing the synthesis of peptidoglycan, so which prokaryotes should be most vulnerable to inhibition by penicillin? gram-positive bacteria mycoplasmas gram-negative bacteria archaea

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Give a specific example from your development that is caused by the influences of Nature. Then explain why this demonstrates Nature.

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laura j.