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The line voltage of a wye-connected 2400-V 600-kVA unity power factor AC generator is reconnected for delta operation. What is the new voltage, current, and kilovoltampere rating?

The line voltage of a wye-connected 2400-V 600-kVA unity power factor AC generator is reconnected for delta operation. What is the new voltage, current, and kilovoltampere rating?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Course #1105 Transformers 3. What must be the speed of a six-pole 25-Hz synchronous generator? a) 500 rpm b) 900 rpm c) 1200 rpm d) none of the above 4. A three-phase generator has a load of 100 kW per phase at a power factor of 80 percent, lagging. A) What is the three-phase kilowatt load? a) 30.1 kW b) 300 kW c) 375 kW d) none of the above B) What is the three-phase kilovoltampere load? a) 30.1 kVA b) 300 kVA c) 375 kVA d) none of the above C) What is the line current if the line voltage is 7200 V? a) 30.1 A - b) 300 A c) 375 A d) none of the above The line voltage of a wye-connected 2400-V 600-kVA unity power factor AC generator is reconnected for delta operation. What is the new voltage, current, and kilovoltampere rating? 5. A) Voltage a) 1385.6 V b) 2400 V c) 4156.9 V d) none of the above
Transcribed Image Text:Course #1105 Transformers 3. What must be the speed of a six-pole 25-Hz synchronous generator? a) 500 rpm b) 900 rpm c) 1200 rpm d) none of the above 4. A three-phase generator has a load of 100 kW per phase at a power factor of 80 percent, lagging. A) What is the three-phase kilowatt load? a) 30.1 kW b) 300 kW c) 375 kW d) none of the above B) What is the three-phase kilovoltampere load? a) 30.1 kVA b) 300 kVA c) 375 kVA d) none of the above C) What is the line current if the line voltage is 7200 V? a) 30.1 A - b) 300 A c) 375 A d) none of the above The line voltage of a wye-connected 2400-V 600-kVA unity power factor AC generator is reconnected for delta operation. What is the new voltage, current, and kilovoltampere rating? 5. A) Voltage a) 1385.6 V b) 2400 V c) 4156.9 V d) none of the above
B) Current a) 83.34 A b) 144.34 A c) 250 A d) none of the above C) kVA a) 600 kVA b) 1039.23 kVA c) 1257 kVA d) none of the above A) Find the regulation of an AC generator that has a full-load voltage of 2400 V and no-load voltage of 3240 V at 80 percent lagging power factor. 6. a) 20 % b) 27 % -c) 35 % d) none of the above B) Will the percent regulation at unity power factor be larger than, smaller than, or the same as at 80 percent lagging power factor? a) larger b) smaller c) d) same none of the above 7. What is the kilowatt rating of a three-phase 975-kVA generator at A) unity power factor? a) 487.5 kW b) 780 kW c) 975 kW none of the above d)
Transcribed Image Text:B) Current a) 83.34 A b) 144.34 A c) 250 A d) none of the above C) kVA a) 600 kVA b) 1039.23 kVA c) 1257 kVA d) none of the above A) Find the regulation of an AC generator that has a full-load voltage of 2400 V and no-load voltage of 3240 V at 80 percent lagging power factor. 6. a) 20 % b) 27 % -c) 35 % d) none of the above B) Will the percent regulation at unity power factor be larger than, smaller than, or the same as at 80 percent lagging power factor? a) larger b) smaller c) d) same none of the above 7. What is the kilowatt rating of a three-phase 975-kVA generator at A) unity power factor? a) 487.5 kW b) 780 kW c) 975 kW none of the above d)
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