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Consider a source of voltage
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Chapter 3 Solutions
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- Given a series circuit consisting of a DC voltage source, resistor, capacitor, inductor, and switch which closes at t=0. All elements are initially uncharged. If V=4 volts, R=64 Ohms, C=1/520 Farads, and L=8 Henries, Determine the circuit current (A,B,H,D): i(t)=Aexp(-Bt)sin(Ht+D) amps.arrow_forwardNominal tests 50 kVA, 20,000 / 480 V, 60 Equivalent of single phase transformer in Hz to determine circuit parameters Table of data for experiments presented. a. Obtain the T-equivalent circuit of the transformer reduced to secondary. b. Calculate the efficiency of the loaded transformer with 0.7-inductive power factor at the label current. c. The transformer is connected to the 50 Hz network and 0.7-inductive power factor at the tag current loaded with. Calculate the efficiency of the transformer.arrow_forwardF.a. In a step-up transformer having a 1 to 2 turn ratio, the 12-V secondary provides 5 A to the load. The primary current isA. 20 AB. 5 AC. 10 AD. 2.5 A F.b. Which one of the following voltages is typical of a value used by utilities for long-distance transmission of electrical power?A. 4800 VB. 345,000 VC. 240 VD. 120 Varrow_forward
- An Electrical engineer is asked by a client to prepare a technical specification on specific items connected with a project. Hence, the engineer is requested to prepare the technical specification of the following: PROJECT: A Subdivision Development Lot AREA; 2 Hectares LOCATION: Brgy. Kanlurang Mayao, Lucna City Technical specification of fuse cutout Technical specification of transformerarrow_forwardParameters of a 20 kVA, 2200/220 V, 50 Hz distribution transformer, R1 = 5 Ω R2 = 0.04 Ω Rc = 3000 Ω X1 = 15 Ω X2 = 0.14 Ω Xm = 2500 Ω given as. According to this, a) Find the equivalent circuit transferred to the high voltage side. b) When the transformer is operating at its rated load, the load voltage is 220 V and the power factor is 0.8 behind. Via the equivalent circuit you got above, b1) Input current, (I1 =?) b2) Input voltage, (V1 =?) b3) Input power factor, (φ1 =?) b4) Copper and core losses, (Pcu = ?, Pc =?) b5) Efficiency, (η =?)arrow_forwardsingle coil 600 turns instrument transformer, operating in the step-down mode with a 40 percent tap, supplies a 5 kVA, 0.88 power factor inductive load. The input to the transformer is 3.3 kV, 50 Hz. Assume that leakage effects and minor losses in transformer are negligible. Determine the following : (0) Turn ratio; (ii) Load current(in Amp); (iii) Incoming line current(in Amp); (iv) Transformed current (in Amp); (v) Apparent power conducted(in kVA)and (vi) Apparent power transformed"arrow_forward
- 1) A 600 V source feeds a 480 V load with a transformer Conventional 5000 VA, 480/120 V. Consider the ideal transformer. a) Calculate the apparent nominal power of the transformer in the connection as Autotransformer. b) Calculate the currents on the high voltage side and on the low voltage side in these conditions. c) Calculate the current in the common coil in the connection as Autotransformer.arrow_forward"A single coil 800 turns instrument transformer, operating in the step-downs mode with a 25 percent tap, supplies a 10 kVA, 0.80 power factor lagging load. The input to the transformer is 6600 V, 50 Hz. Assume that leakage effects and minor losses in transformer are negligible. Determine the following : (i) Turn ratio; (ii) Load current(in Amp); (iii) Incoming line current(in Amp); (iv) Transformed current (in Amp); (v) Apparent power conducted(in kVA)and (vi) Apparent power transformed"arrow_forwardA 10 kVA, 500/250 V, single phase transformer has its maximum efficiency of 94% when delivering 90% of its rated output at unity p.t. Estimate its efficiency when delivering its full load output at p.t. of 0.8 lagging.3arrow_forward
- 2)A factory consumes a total power of 2000kW, with a power factor of 0.6 of a transformer whose primary voltage is 6kV. A synchronous capacitor is purchased to improve overall fp. Assuming that the losses in the synchronous capacitor are of 25kW, calculate:a) The original reactive power of the inductive loadb) The correction reactive power necessary to raise the power factorc) The nominal kVA power of the synchronous capacitor and its pf.arrow_forward8046/447 volts, 20 hr, 191.763 KVA, step down transformer has an induce emf of 3 volts per turn Assuming an ideal transformer. calculate its full load primary currentarrow_forwardQ13) An ideal transformer connected to a 240V mains, supplies a 12V, 150W lamp. Calculate the Transformer turns ratio. a. 45 b. 0.05 c. 50 d. 5arrow_forward
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