Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Which of the following is/are a part a generator's electric circuit?
a) the commutator b) the brushes c) the armature windings d) all of the above
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- 3. A 7970 V:120 V, 60 Hz potential transformer has the following parameters as seen from the high-voltage (primary) windings: X = 1721 Ω _ Χ = 1897 Ω_Xm = 782 kΩ = R₁ = 1378 2 R₂ = 1602 $2 a) Assuming that the secondary is open circuited and that the primary is connected to a 7.97 kV source, calculate the magnitude and the phase angle (with respect to the high-voltage source) of the voltage at the secondary terminals. b) Calculate the magnitude and the phase angle of the secondary voltage if a 1-kn resistive load is connected to the secondary terminals.arrow_forwardA 4 pole machine generates 250 volts when operated at 1500 rpm. If the flux per pole is 1.85 x 10°maxwell. The number of armature slots is 45 and the armature winding has two parallel paths. Calculate. a). the total number of armature conductor. b). the number of conductor in each slot c). If the speed of the generator is decrease to 1,350 rpm, what will be the generated voltage if the flux per pole is maintained at the value. d). To what value of flux per pole should the excitation be adjusted if the generated voltage is to remain the same. (Hint: Eav and Eg = lave x ²) ØXP X tarrow_forward5. Calculate the flux per pole required on full-load for a 50 kW, 400 V, 8-pole, 600 r.p.m. d.c. shunt generator with 256 conductors arranged in a lap-connected winding. The armature winding resistances is 0.1 Ω, the shunt field resistance is 200 Ω and there is a brush contact voltage drop of 1 V at each brush on full-load. Subject Electrical Machine 1arrow_forward
- what are the main differences between a magnetic stirrer and a vortex mixer? Which one is more efficient?arrow_forward1A. Which of the following is/are a method of providing field excitation for a DC generator. a) separately excited shunt b) self-excited series c) self-excited shunt d) all of the above 1B. Which type of field winding typically has the higher resistance? a) series b) shuntarrow_forwardWhat is the operation of a dc generator? Create a bulleted set of informationarrow_forward
- A 4-Pole, duplex wave-wound de generator, has 144 slots with 2 coils per slot, each having two turns. If the flux per pole is is 20mWb and the armature rotates at 1500 rpm and the armature develops a power of 25kW, what will be the value of its constant "K" for this machine?arrow_forward(a) A 4-pole generator, with wave wound armature, has 51 slots, each having 24 conductors. The flux per pole is 0.01 weber. At what speed must the armature rotate to give an induced emf of 220 V² ? (b) What will be the voltage developed, if the winding is lap and the armature rotates it the same speed?arrow_forwardA 3-phase, 6-pole, 25 Hz, Y-connected AC generator has a stator with 48 slots, each slot contains 20 conductors. The coils of each phase are connected in series. The flux density is 0.5 T. What is the speed of rotation of the stator magnetic field in RPM? Answer: The speed is: RPM.arrow_forward
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