A 220-V, 900-rpm, dc series motor takes 25 A at full load and rated speed. The armature and field-winding resistances ar

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answerhappygod
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A 220-V, 900-rpm, dc series motor takes 25 A at full load and rated speed. The armature and field-winding resistances ar

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A 220-V, 900-rpm, dc series motor takes 25 A at full load and
rated speed. The armature and field-winding resistances are 0.2 Ohm
and 0.3 Ohm, respectively. The rotational loss is 300 W and assumed
to be constant. Calculate: (a) the back e.m.f, (b) the power output
(c) the output torque (d) the copper loss (e) the efficiency (f) if
the motor is driving a load with a torque 46 N.m at a speed of 800
rpm, what is the motor current?
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