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A. A 20KW, 440V, SHORT SHUNT COMPOUND DC GENERATOR HAS FULL LOAD EFFICIENCY OF 87%. IF THE RESISTANCE OF THE ARMATURE AND INTERPOLES IS 0.40HM AND THAT OF THE SERIES AND SHUNT FIELDS 0.250HM AND 240OHMS RESPECTIVELY, CALCULATE THE COMBINED BEARING FRICTION, WINDAGE AND CORE LOSS OF THE MACHINE

A. A 20KW, 440V, SHORT SHUNT COMPOUND DC GENERATOR HAS FULL LOAD EFFICIENCY OF 87%. IF THE RESISTANCE OF THE ARMATURE AND INTERPOLES IS 0.40HM AND THAT OF THE SERIES AND SHUNT FIELDS 0.250HM AND 240OHMS RESPECTIVELY, CALCULATE THE COMBINED BEARING FRICTION, WINDAGE AND CORE LOSS OF THE MACHINE

Power System Analysis and Design (MindTap Course List)
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter11: Transient Stability
Section: Chapter Questions
Problem 11.3P
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A. A 20KW, 440V, SHORT SHUNT COMPOUND DC GENERATOR HAS FULL LOAD EFFICIENCY OF 87%. IF THE RESISTANCE OF THE ARMATURE AND INTERPOLES IS 0.40HM AND THAT OF THE SERIES AND SHUNT FIELDS 0.250HM AND 240OHMS RESPECTIVELY, CALCULATE THE COMBINED BEARING FRICTION, WINDAGE AND CORE LOSS OF THE MACHINE B. A 100V, SHUNT GENERATOR HAS A FULL LOAD CURRENT OF 100A, SHUNT FIELD RESISTANCE OF 55 OHMS AND CONSTANT LOSSES OF 500W. IF FULL LOAD EFFICIENCY IS 88%, FIND ARMATURE RESISTANCE. ASSUMING VOLTAGE TO BE CONSTANT AT 110V, CALCULATE THE EFFICIENCY AT HALF LOAD AND AT 50% OVERLOAD. FIND THE LOAD CURRENT. C. AN 8 POLE LAP WOUND DC GENERATOR HAS 1210 SLOTS HAVING 4 CONDUCTORS PER SLOT. IF EACH CONDUCTOR CAN CARRY 250A ANF FLUX/POLE IS 0.05 WB, CALCULATE THE SPEED OF THE GENERATOR FOR GIVING 240V ON OPEN CIRCUIT. IF THE VOLTAGE DROPS TO 220V ON FULL LOAD, FIND THE RATED OUTPUT OF THE MACHINE. D. CALCULATE THE FLUX PER POLE REQUIRED ON FULL LOAD FOR A 50KW, 400V, 8 POLE, 600 RPM DC SHUNT GENERATOR WITH 256 CONDUCTORS ARRANGE IN A LAP CONNECTED WINDING. THE ARMATURE RESISTANCE IS 0.1 OHM AND SHUNT FIELD RESISTANCE IS 200 OHMS AND THERE IS A BRUSH CONTACT VOLTAGE DROP OF 1V PER BRUSH ON FULL LOAD. E. A 420 KW 600-VOLT 580 RPM LONG SHUNT GENERATOR HAS AN ARMATURE RESISTANCE OF 0.03 OHM, SERIES FIELD RESISTANCE OF 0.01 OHM, SHUNT FIELD RESISTANCE OF 45 OHMS AND SPL OF 12 KW. CALCULATE THE NECESSARY DRIVING TORQUE AT RATED LOAD IN LB-FT. F. A 10 KW 250 VOLTS SELF-EXCITED GENERATOR, WHEN DELIVERING RATED LOAD, HAS AN ARMATURE-CIRCUIT VOLTAGE DROP OF 5% OF THE TERMINAL VOLTAGE AND A SHUNT FIELD CURRENT EQUAL TO 5% OF THE RATED LOAD CURRENT. CALCULATE THE FIELD RESISTANCE.
Transcribed Image Text:A. A 20KW, 440V, SHORT SHUNT COMPOUND DC GENERATOR HAS FULL LOAD EFFICIENCY OF 87%. IF THE RESISTANCE OF THE ARMATURE AND INTERPOLES IS 0.40HM AND THAT OF THE SERIES AND SHUNT FIELDS 0.250HM AND 240OHMS RESPECTIVELY, CALCULATE THE COMBINED BEARING FRICTION, WINDAGE AND CORE LOSS OF THE MACHINE B. A 100V, SHUNT GENERATOR HAS A FULL LOAD CURRENT OF 100A, SHUNT FIELD RESISTANCE OF 55 OHMS AND CONSTANT LOSSES OF 500W. IF FULL LOAD EFFICIENCY IS 88%, FIND ARMATURE RESISTANCE. ASSUMING VOLTAGE TO BE CONSTANT AT 110V, CALCULATE THE EFFICIENCY AT HALF LOAD AND AT 50% OVERLOAD. FIND THE LOAD CURRENT. C. AN 8 POLE LAP WOUND DC GENERATOR HAS 1210 SLOTS HAVING 4 CONDUCTORS PER SLOT. IF EACH CONDUCTOR CAN CARRY 250A ANF FLUX/POLE IS 0.05 WB, CALCULATE THE SPEED OF THE GENERATOR FOR GIVING 240V ON OPEN CIRCUIT. IF THE VOLTAGE DROPS TO 220V ON FULL LOAD, FIND THE RATED OUTPUT OF THE MACHINE. D. CALCULATE THE FLUX PER POLE REQUIRED ON FULL LOAD FOR A 50KW, 400V, 8 POLE, 600 RPM DC SHUNT GENERATOR WITH 256 CONDUCTORS ARRANGE IN A LAP CONNECTED WINDING. THE ARMATURE RESISTANCE IS 0.1 OHM AND SHUNT FIELD RESISTANCE IS 200 OHMS AND THERE IS A BRUSH CONTACT VOLTAGE DROP OF 1V PER BRUSH ON FULL LOAD. E. A 420 KW 600-VOLT 580 RPM LONG SHUNT GENERATOR HAS AN ARMATURE RESISTANCE OF 0.03 OHM, SERIES FIELD RESISTANCE OF 0.01 OHM, SHUNT FIELD RESISTANCE OF 45 OHMS AND SPL OF 12 KW. CALCULATE THE NECESSARY DRIVING TORQUE AT RATED LOAD IN LB-FT. F. A 10 KW 250 VOLTS SELF-EXCITED GENERATOR, WHEN DELIVERING RATED LOAD, HAS AN ARMATURE-CIRCUIT VOLTAGE DROP OF 5% OF THE TERMINAL VOLTAGE AND A SHUNT FIELD CURRENT EQUAL TO 5% OF THE RATED LOAD CURRENT. CALCULATE THE FIELD RESISTANCE.
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