A 10-hp compound DC motor connected short-shunt is supplied by a 115-V source. The full-load current is 90 A. The shunt-field resistance is 90 Ω, the armature resistance is 0.08 Ω, and the series-field resistance is 0.04Ω Find ... A) the shunt-field current a) .57 A b) 1.24 A c) 2.3 A d) none of the above B) the armature current a) 8.88 A b) 88.8 A c) 888 A d) none of the above C) the counter emf a) 96 V b) 99.4 V c) 104.3 V d) none of the above
A 10-hp compound DC motor connected short-shunt is supplied by a 115-V source. The full-load current is 90 A. The shunt-field resistance is 90 Ω, the armature resistance is 0.08 Ω, and the series-field resistance is 0.04Ω Find ...
A) the shunt-field current
a) .57 A b) 1.24 A c) 2.3 A d) none of the above
B) the armature current
a) 8.88 A b) 88.8 A c) 888 A d) none of the above
C) the counter emf
a) 96 V b) 99.4 V c) 104.3 V d) none of the above
D) the efficiency at full load
a) 65.3 % b) 72..1 % c) 88.8 % d) none of the above
E) the full-load copper losses
a) 626.1 W b) 1092 W c) 1798 W d) 2265 W
F) the rotational losses (iron losses plus
a) 626.1 W b) 1092 W c) 1798 W d) 2265 W
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