Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 3, Problem 3.3P
The first ac power system in the United States ran at a frequency of 133 Hz. If the ac power for this system were produced by a four-pole generator, how fast would the shaft of the generator have to rotate?
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A separately-excited dc generator develops 288 volts at a certain flux and at a certain speed. What should be the new generated voltage in volts for this machine if the speed is changed to 85 % of
the original value and the flux is increased by 67 % from the original value?
A 3-phase, 60 Hz, Y-connected, AC generator has a stator with 72 slots, each slot contains 10 conductors. The conductors of each phase
are connected in series. The flux per pole in the machine is 0.04 Wb. The speed of rotation of the magnetic field is 720 RPM.
What are the resulting RMS phase voltage and RMS line voltage of this stator?
Select one:
O a. None
O b. V = 1279.5 Volts and VT = 1279.5 Volts
O c. V = 1279.5 Volts and VT = 2216.2 Volts
O d. V = 1809.5 Volts and V- = 3134.1 Volts
O e. V = 2216.2 Volts and VT = 2216.2 Volts
Clear my choice
A separately-excited DC generator has a magnetization curve shown in Figure 1. What is the internally-generated voltage Ea in volts
if its prime mover speed is 1400 RPM and the current through the field circuit is 7 A? (answer in 2 decimal places)
EAl
...
500
465
450
420
430
400
300
200
100
1.0
2.0
3.0
4.0 5.0 6.0
7.0
8.0
9.0
10.0
4.75
5.2
6.15
Field current, A (Note: At Ia = 0, E, = 3 V)
Magnetization Curve at nm= 1800 rpm
Add your answer
Internal generated voltage, V
Chapter 3 Solutions
Electric machinery fundamentals
Ch. 3 - What is the principal difference between a...Ch. 3 - Prob. 3.2QCh. 3 - Prob. 3.3QCh. 3 - What is the equation for the induced torque in an...Ch. 3 - The simple loop rotating in a uniform magnetic...Ch. 3 - Prob. 3.2PCh. 3 - The first ac power system in the United States ran...Ch. 3 - A three-phase, Y-connected, four-pole winding is...Ch. 3 - A three-phase, -connected, six-pole winding is...Ch. 3 - A three-phase, Y-connected, 60 Hz, two-pole...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- a 6-pole dc generator has 500 armature conductors, and a useful flux of 0.05Wb per pole. What will be the emf generated if it is a lap-connected and runs at 1200rpm? what must be the speed at which it is to be driven to produce the same emf if it is wave-wound ?arrow_forwardThe simplex lap DC generator has 4 poles, 16 slots, with a constant rpm of 600 rpm and 4 conductors per slot. Determine the following: a. Flux per pole (Ø) b. Commutator Pitch c. Pole Pitch d. Coil Pitcharrow_forwardA 3-phase, 60 Hz, Delta-connected, AC generator has a stator with 60 slots, each slot contains 12 conductors. The conductors of each phase are connected in series. The flux per pole in the machine is 0.05 Wb. The speed of rotation of the magnetic field is 720 RPM. What are the resulting RMS phase voltage and RMS line voltage of this stator? Select one: O a. Vo = 2770 Volts and V- = 2770 Volts O b. None O c. Va = 1599.4 Volts and VT = 1599.4 Volts O d. Vo = 2262.0 Volts and VT = 3917.8 Volts O e. Vo = 1599.4 Volts and VT = 2770 Volts Clear my choicearrow_forward
- A four pole machines generates 250V when operated at 1500 rpm. If the flux per pole is 1.85 x 106 maxwell, the number of armature slots is 45 and the armature winding has two parallel paths. If the speed of the generator is reduced to 1350 rpm, what would be the generated voltage. To what value of flux per pole should the excitation be adjusted if the generated voltage is to remain the same at 250Varrow_forwardA 3-phase, 60 Hz, Y-connected, AC generator has a stator with 60 slots, each slot contains 12 conductors. The conductors of each phase are connected in series. The flux per pole in the machine is 0.04 Wb. The speed of rotation of the magnetic field is 720 RPM. What are the resulting RMS phase voltage and RMS line voltage of this stator? Select one: O a. V = 2216.2 Volts and V- = 2216.2 Volts O b. Vo = 1279.5 Volts and VT = 2216.2 Volts O c. Vo = 1809.5 Volts and VT = 3134.1 Volts O d. Va = 1279.5 Volts and V, = 1279.5 Volts O e. None Clear my choicearrow_forwardThe simplex armature of a six-pole generator carries a total current of 350 amperes. What current flows in each path if the winding is (a) lap? (b) wave? (Our subject is Electrical Machines 1, the lesson is DC Generators)arrow_forward
- A 3-phase, 50 Hz, Delta-connected, AC generator has a stator with 60 slots, each slot contains 12 conductors. The conductors of each phase are connected in series. The flux per pole in the machine is 0.05 Wb. The speed of rotation of the magnetic field is 720 RPM. What are the resulting RMS phase voltage and RMS line voltage of this stator? Select one: O a, None O b. Va = 1332.87 Volts and VT = 2308.6 Volts O c. V = 2308.6 Volts and VT = 2308.6 Volts O d. V = 1332.87 Volts and VT = 1332.87 Volts O e. V = 1885 Volts and V- = 3265 Volts Clear my choicearrow_forwardA 3-phase, 50 Hz, Y-connected, AC generator has a stator with 72 slots, each slot contains 10 conductors. The conductors of each phase are connected in series. The flux per pole in the machine is 0.04 Wb. The speed of rotation of the magnetic field is 720 RPM. What are the resulting RMS phase voltage and RMS line voltage of this stator? Answers: The resulting RMS Phase Voltage is: I Volts, The resulting RMS Line Voltage is: Volts,arrow_forwardWhat is the operation of a dc generator? Create a bulleted set of informationarrow_forward
- what three factors determine the output voltage of a DC generator?arrow_forward3-3. The first ac power system in the United States ran at a frequency of 133 Hz. If the ac power for this system were produced by a four-pole generator, how fast would the shaft of the generator bave to rotate? 3-4. A three-phase, Y-connected, four-pole winding is installed in 24 slots on a stator. There are 40 turns of wire in each slot of the windings. All coils in cach phase are connected in series. The flux per pole in the machine is 0.060 Wb, and the speed of rotation of the magnetic field is 1800 r/min. (a) What is the frequency of the voltage produced in this winding? (b) What are the resulting phase and terminal voltages of this stator?arrow_forwardThe strength of the rotating magnetic field in a three phase induction motor is equal to times the flux produce ...... ....... in one of the phase windings. 1.25 1 O 1.5arrow_forward
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