A simply supported beam with a span length of 45 feet is laterally supported at its ends and is subjected to the following service loads: Dead load=400 lbyft (including the weight of the beam) Live load = 1000 lbyft If Fy=50 ksi, is a W14x 90 adequate? ---
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- 2. Solve the system below by matrix inversion method: 4x1 – 3x2 = –3 2x1 – 5x2 = 9Match the following: (i) Hysteresis loss (a) Can be redud by constructing the core with laminated sheets of alloy steel (ii) Eddy current loss (b) Can be reduced by the use of special high grades of alloy stl as core material.925 3- The approximate equivalent circut of is to be determined. The open-circuit at 0 20KVA, 8000/240 V 60 Hz transformar short-circut tests that were performed transformer. primary side gave the following results. Open - Circut Test V₁x = 8000 Iloc=0-214 A Ploc = 400 W Short-Circuit Test |Visc = 489V 5₁s = 2.5A Pisc = 240k/ al Find the components of the magnetising branch i referred to the primary side b) Find the Components of the equivalent series impedence referred to the primary side. 119 210 2 15 16
- 6. For the air core transformer circuit shown below, determine the currents la and lb in the direction shown. Express each answer in polar form. R1-302 www la ZI1=150 E=10/0 M=j20 Ze= n Z12=j62 lb R2=50 la Ib7. Three load units A, B, and Care connected in parallel and take currents that are respectively 11 A, 10A and 15A. Assuming IA to be the reference phasor, IB leads IA by 30degrees and IC legs behind IA by 65degrees. Calculate the total (resultant) currentand angle it makes with the x-axis.TYDDIAD I Q4-(A)-draw the phasor diagram of the transformer at full load with inductive load
- 6 In terms of their constructional features, transformers are classified in to: Core and Shell Types Transmission and Distribution transformers Step-up & Step down transformers Core & Shill Types6. The figure below shows a single-line-diagram of part of a power system. For each transformer in the diagram state a suitable connection method, giving reasons for your suggested connection method. G1 G1 800MW 200MW 15kV 10kV T1-T4 88 T5-T6 250MVA each 125MVA each 330/15kV 88/10kV Line 1 Line 2 T7-T8 100MVA each 330/88kV T9 T10-T11 50MVA 50MVA each 88/66kV 88/11kV T12 2MVA 11/0.4kV Singe-phase loadsThe copper loss and iron loss of transformer at full load are 3600W and 500 W respectively. The copper loss and iron loss at 25% of full load will be respectively 1-(3600 W and 1000 W) 2-(1800 W and 500W) 3-(1800 W and 1000W) 4-(225W and 500 W)
- solve for branch currents using kirchhoffsEach conductor of a 3-0 overhead line is suspended from a cross arm of a steel tower by a string of 4 suspension insulators. The voltage across the third 33 kV. The shunt capacitance between each insulator and the earth is 1/8th of the capacitance of the insulator itself. Find the voltage across string and string efficiency. D-128 Lod FaTriaxial has a single core and two shields like a twin-axial coaxial cable. Select one: O True O False