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- The student engineer of a campus radio station wishes to verify the effectiveness of the lightning rod on the antenna mast (as shown). The unknown resistance Rx is between points C and E. Point E is a true ground, but it is inaccessible for direct measurement because this stratum is several meters below the Earth’s surface. Two identical rods are driven into the ground at A and B, introducing an unknown resistance Ry. The procedure is as follows. Measure resistance R1 between points A and B, then connect A and B with a heavy conducting wire and measure resistance R2 between points A and C. (a) Derive an equation for Rx in terms of the observable resistances, R1 and R2. (b) A satisfactory ground resistance would be Rx < 2.00 Ω. Is the grounding of the station adequate if measurements give R1 = 13.0 Ω and R2 = 6.00 Ω? Explain.Scenario: You work as a materials engineer and have been tasked with investigating issues with substandard cables manufactured by your company. These cables are made from copper with varying cross sectional areas depending upon their current carrying capacities. Cables are not meeting the required voltage drop characteristics compared to theoretical values, but your manager is not sure of the reason for this and has hypothesised that this could be due to impurities within the copper itself. It has been suggested that the resistivity of the copper used should be investigated. With reference to the attached samples picture: A) what is the actual resistance of the cable samples. given that you multiply the cross sectional area by strand number. B) what is the actual resistivity of each sample.Refer to the Wheatstone Bridge below to derive the relationship between VEX and VO. (Including induction course, Hint: Kirchhoff’s Law)
- - Loads, Service, and Overcurrent Protection 6.a. The general lighting load is based on a _______ per square foot basis.A. kilowattB. number of circuitsC. volt-ampereD. general illumination6.b. What's the primary disadvantage of using copper conductors?A. AvailabilityB. WeightC. CostD. DurabilityTwo wires A & B made from two different materials have temperature coefficient of resistance equal to 0.0025 and 0.0005 ohm per C , respectively . It is desired to make a coil of wire having a resistance of 1200ohms with a temperature coefficient of 0.001 , using suitable lengths of the two given wires connected in series . Determine the required length of wire A ?A Victoria plaza sub-station supplies 60kW to a load over 250 ft, 100mm2 , two conductors copper feeder, the resistance of which is 0.078 ohm per 100 ft. The bus bar voltage is maintained constant at 600V.Determine the load current
- The number of potential interfaces (points of contact) between various parts of a system.Give reasons and back them up with examples.If the same meter movement from no.1 is to be used in an Ayrton shunt arrangement, find the required resistances for 1 A, 500 mA and 100 mA ranges. (Given in no.1:A 500-Ω shunt resistance was connected to a 5-mA meter movement to form a 25-mA single range DC ammeter.)A 415 single core cable has a conductor diameter of 0.5 cm and a sheath of inside diameter 3 cm. In cable insulation, find: (i) minimum stress (in V/cm); (ii) maximum stress in (V/cm); (iii) Describe where these minimum and maximum stress will occur in cable insulation?; (iv) Suggest what should be the minimum dielectric strength (in V/mm) of the cable insulation to avoid any breakdown of the given cable
- A given wire has a resistance of 17.5 ohms. If its length is 560m, how much length must be cut off from the wire in order to reduce its resistance to 12.5 ohms. assume to cross sectional area of the wire to be constantA 0.1-W small cylindrical resistor mounted ona lower part of a vertical circuit board is 0.3 in long andhas a diameter of 0.2 in. The view of the resistor is largelyblocked by another circuit board facing it, and the heat transferthrough the connecting wires is negligible. The air is free to flow through the large parallel flow passages between theboards as a result of natural convection currents. If the airtemperature at the vicinity of the resistor is 120°F, determinethe approximate surface temperature of the resistor. Evaluateair properties at a film temperature of 170°F and 1 atm pressure.Is this a good assumption?Please answer this NEATLY, COMPLETELY, and CORRECTLY for an UPVOTE. Jusr answer letters d, e, f. A cable hangs between two poles that are 80-ft apart. The two poles are both 40 foot high. Sag is observed in the middle of the cable 5 ft from the ground. Find the length of the cable. d. What is the general equation for length of the cable S?e. What are the boundary conditions for finding the total length of the cable S?f. What is the length of the cable S?***Note!For your basis, here are the questions for letters a-c which have already been answered in this link (https://www.bartleby.com/questions-and-answers/cable-hangs-between-two-poles-that-are-80-ft-apart.-the-two-poles-are-both-40-foot-high.-sag-is-obse/552ca7ad-6b18-4584-bd7a-02bbebcb1f20):a. What is the working equation for a catenary forming cable?b. What is the computed constant a up to 4 decimal places?c. What is the catenary equation for the given problem?