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Each pole of a 100 kW, 250 V flat-compound generator has a shunt field of 2000 turns and

Each pole of a 100 kW, 250 V flat-compound generator has a shunt field of 2000 turns and

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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a of 7 If the total shunt- when the at rated voltage field is 100 N, mmf exciting to 120 Va Fig. 18b the saturation curve of a dc generator DIRECT-CURRENT GENERATORS 92 Questions and Problems m6 a. at no-load b. at full-load Practical level Sketch the main components of a dc 1. generator. 2 Why are the brushes of a dc machine always placed at the neutral points?d lo ioqbim Describe the construction of a commutator. 12 curve of a separately excited dc generator when it revolves at 1500 r/min. Calculata 3 How is the induced voltage of a separately excited dc generator affected if a. the speed increases? b. the exciting current is reduced? 1330 r/min. 13 Referring to Fig. 10, the induced voltage :, coil D is momentarily 18 V, in the position shown. Calculate the voltages induced in coils A, B, and C at the same instant. 4 450 5. generator? How do we adjust the voltage of a shunt 14 Referring to Fig. 11b, calculate the voltage 6. The terminal voltage of a shunt generator decreases with increasing load. Explain. induced in coil A when the armature has ro- tated by 90°; by 120°. Explain why the output voltage of an over- compound generator increases as the load h increases. Brush x is positive with respect to brush y in 15 Fig. 11b. Show the polarity of each of the 12 coils. Does the polarity reverse when a coil 8. pound, and differential compound generators Explain the difference between shunt, com- turns through 180°? a. as to construction b. as to electrical properties The generator of Fig. 38 revolves at 960 r/min and the flux per pole is 20 mWb. Calculate the no-load armature voltage if Intermediate level each armature coil has 6 turns. Com 9 A separate excited dc generator turning at 1400 r/min produces an induced voltage of 127 V. The armature resistance is 2 and m shos the machine delivers a current of 12 A. T 17 a. How many brush sets are needed for the generator in Fig. 38? b. If the machine delivers a total load (a) flowing in each armature coil. current of 1800 A, calculate the current Calculate gomta. the terminal voltage [V] b. the heat dissipated in the armature [W] lo no C. the braking torque exerted by the dene Advanced level The voltage between brushes x and y is 240 V in the generator shown in Fig. 38. Why can we say that the voltage between armature [N m] o viluto i 10. no-load voltage of 115 V. What happens if a. the speed is increased by 20 percent?h b. the direction of rotation is reversed? c. the exciting current is increased by 10 percent? d. the polarity of the field is reversed? 11 Each pole of a 100 kW, 250 V flat-compound A separately excited dc generator produces a Referring to Fig. 10, determine the polarily clockwise. 20 a. In Fig. 38 determine the polarity of P generator has a shunt field of 2000 turns and ECUGUI knowing that the armature is turning clockwise.
Transcribed Image Text:a of 7 If the total shunt- when the at rated voltage field is 100 N, mmf exciting to 120 Va Fig. 18b the saturation curve of a dc generator DIRECT-CURRENT GENERATORS 92 Questions and Problems m6 a. at no-load b. at full-load Practical level Sketch the main components of a dc 1. generator. 2 Why are the brushes of a dc machine always placed at the neutral points?d lo ioqbim Describe the construction of a commutator. 12 curve of a separately excited dc generator when it revolves at 1500 r/min. Calculata 3 How is the induced voltage of a separately excited dc generator affected if a. the speed increases? b. the exciting current is reduced? 1330 r/min. 13 Referring to Fig. 10, the induced voltage :, coil D is momentarily 18 V, in the position shown. Calculate the voltages induced in coils A, B, and C at the same instant. 4 450 5. generator? How do we adjust the voltage of a shunt 14 Referring to Fig. 11b, calculate the voltage 6. The terminal voltage of a shunt generator decreases with increasing load. Explain. induced in coil A when the armature has ro- tated by 90°; by 120°. Explain why the output voltage of an over- compound generator increases as the load h increases. Brush x is positive with respect to brush y in 15 Fig. 11b. Show the polarity of each of the 12 coils. Does the polarity reverse when a coil 8. pound, and differential compound generators Explain the difference between shunt, com- turns through 180°? a. as to construction b. as to electrical properties The generator of Fig. 38 revolves at 960 r/min and the flux per pole is 20 mWb. Calculate the no-load armature voltage if Intermediate level each armature coil has 6 turns. Com 9 A separate excited dc generator turning at 1400 r/min produces an induced voltage of 127 V. The armature resistance is 2 and m shos the machine delivers a current of 12 A. T 17 a. How many brush sets are needed for the generator in Fig. 38? b. If the machine delivers a total load (a) flowing in each armature coil. current of 1800 A, calculate the current Calculate gomta. the terminal voltage [V] b. the heat dissipated in the armature [W] lo no C. the braking torque exerted by the dene Advanced level The voltage between brushes x and y is 240 V in the generator shown in Fig. 38. Why can we say that the voltage between armature [N m] o viluto i 10. no-load voltage of 115 V. What happens if a. the speed is increased by 20 percent?h b. the direction of rotation is reversed? c. the exciting current is increased by 10 percent? d. the polarity of the field is reversed? 11 Each pole of a 100 kW, 250 V flat-compound A separately excited dc generator produces a Referring to Fig. 10, determine the polarily clockwise. 20 a. In Fig. 38 determine the polarity of P generator has a shunt field of 2000 turns and ECUGUI knowing that the armature is turning clockwise.
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