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The object of this problem is to illustrate how the The object of this problem is to illustrate how the armature windings of certain machines, i.e., dc machines, can be approximately represented by uniform current sheets, the degree of correspondence growing better as the winding is distributed in a greater number of slots around the […]

A system such at that shown in Figure is used A system such at that shown in Figure is used to convert balanced 50-Hz voltages to other frequencies. The synchronous motor has four poles and drives the interconnected shaft in the clockwise direction. The induction machine has six poles and its stator windings are connected […]

A three-phase diode bridge is supplied by a three-phase A three-phase diode bridge is supplied by a three-phase autotransformer such that the line-to line input voltage to the bridge can be varied from zero to 230 V. The output of the bridge is connected to the shunt field winding of a dc motor. The resistance […]

A three-phase generator step-up transformer is rated 26-kV: 345- A three-phase generator step-up transformer is rated 26-kV: 345-kV, 850 MVA and has a series impedance of 0.0035 + j0.087 per unit on this base. It is connected to a 26-kV, 800-MVA generator, which can be represented as a voltage source in series with a reactance […]

Repeat Problem 2.11 for a 75-kVA, 60-Hz, 4600-V: 240-V Repeat Problem 2.11 for a 75-kVA, 60-Hz, 4600-V: 240-V distribution transformer whose resistances and leakage reactance’s are R1 = 0.846 ? R2 = 0.00261 ? X11 = 26.8 ? X12 = 0.0745 ? where subscript 1 denotes the 4600-V winding and subscript 2 denotes the 240-V […]

A source which can be represented by a voltage source of 8 V A source which can be represented by a voltage source of 8 V rms in series with an internal resistance of 2k ? is connected to a 50-? load resistance through an ideal transformer. Calculate the value of turns ratio for which […]

Repeat Problem 10.6, using MATLAB to plot the inductor current Repeat Problem 10.6, using MATLAB to plot the inductor current for the first 10 cycles following the switch closing at time t = 0. Is this the question you were looking for? If so, place your order here to get started!

A six-pole, 60-Hz synchronous machine has a rotor winding with A six-pole, 60-Hz synchronous machine has a rotor winding with a total of 138 series turns and a winding factor kr = 0.935. The rotor length is 1.97 m, the rotor radius is 58 cm, and the air-gap length = 3.15 cm. a. What is […]

Repeat Problem 3.4, assuming that the inductor is connected Repeat Problem 3.4, assuming that the inductor is connected to a voltage source which increases from 0 to 0.4 V (part [a]) and then is held constant at 0.4 V (part [b]). For both calculations, assume that all electric transients can be ignored. Is this the […]

Repeat Example 8.3 under the condition that the rotor speed Repeat Example 8.3 under the condition that the rotor speed is 4500 r/min and that a negative voltage of -250 V is used to turn off the phase current. Is this the question you were looking for? If so, place your order here to get […]