5. A block is supported by a system of cables as shown. The weight of the block is 500 N. Determine the tension forces in cables A, B and C. 12.4 m 2.1 mi 2.1 m 0.9 m 1.8 m 1.2 m 1.2 m D 1.8 m 1.5 m
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- Reconsider Problem 3.29. If Va,VbandVc are a negative-sequence set, how would the voltage and current relationships change? (a) If C1 is the complex positive-sequence voltage gain in Problem 3.29 and (b) if C2 is the negative sequence complex voltage gain, express the relationship between C1andC2Consider two interconnected voltage sources connected by a line of impedance Z=jX, as shown in Figure 2.27. (a) Obtain expressions for P12 and Q12. (b) Determine the maximum power transfer and the condition for it toAnalyse several voltage and current situations in different loading scenarios in a simplified radial (transformer to consumption) medium-voltage power system example. There are only 2 nodes in the 35 kV line – node 0 from the 110/35 kV and node 1 with one consumer. The physical characteristics of the line and the loading scenarios are individualized for each student – please see the attached file Excel “WM9P3 Task1 data” for your particular data set. Briefly reflect on the complexity of the calculations for known input or output voltage, as well as for fixed or voltage-dependent consumption in this simple power system model. Analyse and discuss the sensitivity of the voltage drop [in % of amplitude and the degrees of phase] with respect to the current level [in %] and to the power factor.
- Two cities A and B are connected by a 200km long train line. A train leaves A for B at 20 km / h at the same time as another train leaves B for A at 5 km / h. In the samemoment a fly leaves from A to B following the train line. The fly flies at 40 km / h until it collides with train B. At that moment it returns instantly and follows the train line until it collides with train A. At that moment it returns instantly and follows the line of the train. train until it collides with train B. The fly continues this process, traveling ever smaller distances until the two trains meet. (It is an ideal problem and the fly does not get squashed by the trains).What is the total distance traveled by the fly?In an outdoor substation the three bus-bar conductors are supported by units of post type insulators. Each unit consists of a stack of 3 pin type insulators fixed one on the top of the other. The voltage across the lowest insulator is 15kV and that across the next unit is 12kV. Estimate: ratio of mutual to self-capacitance i. the bus-bar voltage of the substation. Efficiency across the string of insulators ii. iii.i) Calculate V1 and V2 for the voltage across the string insulator having phase voltage of 33kV for transmission line using details tabulated in the Table 3(a). Table 3(a) Type of Insulator Shunt Capacitance between each unit 0.1 C String to junction Self -Capacitance of each insulator ii) With the help of a suitable schematic diagram and necessary theoretical explanation, illustrate how to improve the efficiency of the suspension insulator.
- Find the most economical cross-section of a 3-core distributor cable 250 m long supplying a load of 80 kW at 400 V and 0.8pf lagging for 4000 hours per annum and open circuited for the remainder of the year. The cost of the cable including installation is (15a+25) per meter, where a 'is area of each conductor in cm². The interest and depreciation total 10 per cent and cost of energy wasted is 10% per unit. The resistance per km of conductor of 1 cm² cross-section is 0.173ohms.Parts D and E. ThanksI need the answer as soon as possible
- FIVE QUESTIONS ANSWER ALL Question 1 A cylindrical specimen of Aluminum having a diameter of 12.8 mm and a gauge length of 50.800 mm is pulled in tension. Use the load-elongation characteristics shown in the following table to complete Q1(a) through (f). Raw Data Load (N) Length (mm) 50.800 7330 50.851 15100 50.902 23100 50.952 30400 51.003 34400 51.054 38400 51.308 41300 51.816 44800 52.832 46200 53.848 47300 54.864 47500 55.880 46100 56.896 44800 57.658 42600 58.420 36400 59.182 a) Plot both the engineering stress versus engineering strain and true stress versus true strain curves on the same axis. EV[8] b) Compute the modulus of elasticity. EV[3] c) Determine the yield strength at a strain offset of 0.002. AN[3] d) Determine the tensile strength of this alloy. AN[2] e) Compute the modulus of resilience. AN[2] f) What is the ductility, in percent elongation? AN[2]What is the relation between length of span and sag?: a. sag is directly proportional to square of span b. sag is inversely proportional to squareroot of span C. sag is inversely proportional to square of span d. sag is directly proportional to squareroot of spanQuestion 1 Select all that apply. Which of the following are considered to be "core losses"? 12R heating loss Flux lines that bulge out at core gaps Currents that circulate within the machine non-ferrous components Field Lines that circulate around conductors and coils Rapid Changes in Domain orientation