4. A dc shunt motor runs at 900rpm from a 400 V supply when taking an armature current of 25A.Calculate the speed at which it will run from a 230 V supply when taking an armature current of 15 A. The resistance of the armature circuit is 0.8 ohm. Assume the flux per pole at 230 V to have decreased to 75% of its value at 400V.

Introductory Circuit Analysis (13th Edition)
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4. A dc shunt motor runs at 900rpm
from a 400 V supply when taking an
armature current of 25A.Calculate the
speed at which it will run from a 230 V
supply when taking an armature
current of 15 A. The resistance of the
armature circuit is 0,8 ohm. Assume
the flux per pole at 230 V to have
decreased to 75% of its value at 400V.
Transcribed Image Text:4. A dc shunt motor runs at 900rpm from a 400 V supply when taking an armature current of 25A.Calculate the speed at which it will run from a 230 V supply when taking an armature current of 15 A. The resistance of the armature circuit is 0,8 ohm. Assume the flux per pole at 230 V to have decreased to 75% of its value at 400V.
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