An 8 pole DC shunt generator with 900 wave-connected armature conductors supplies 10ohm at 500 V when driven at 500 rpm. The armature resistance 0.4ohm and the field resistance is 250ohm . Determine: . . 2 1.1 The flux per pole 2.1.2 The armature current for maximum efficiency if the rotational losses are 10% of the ar- mature copper losses .
An 8 pole DC shunt generator with 900 wave-connected armature conductors supplies 10ohm at 500 V when driven at 500 rpm. The armature resistance 0.4ohm and the field resistance is 250ohm . Determine: . . 2 1.1 The flux per pole 2.1.2 The armature current for maximum efficiency if the rotational losses are 10% of the ar- mature copper losses . 3.2 A series motor runs at 600 rpm while drawing 40-A from 600-V supply. The total re- sistance of the armature and the field is 0.5-ohm. Determine the value of the additional re- sistance required in series with armature to reduce the speed to 450 rpm if the load toque is: 3.2.1 Constant 3.2.2 Proportional to the square of the speed .
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