A 120 volts shunt motor draws a current of 75 Amperes at rated load. The armature and shunt field resistances are 0.52 and 502, respectively. A multi tap starter rheostat is inserted in the armature circuit to limit the starting current. If the rheostat has a resistance of 22, determine the percentage tap used such that the starting current will be limited to 150% of its full-load value.

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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A 120 volts shunt motor draws a current of 75 Amperes at rated load.
The armature and shunt field resistances are 0.52 and 502, respectively.
A multi tap starter rheostat is inserted in the armature circuit to limit the
starting current. If the rheostat has a resistance of 22, determine the
percentage tap used such that the starting current will be limited to 150%
of its full-load value.
Transcribed Image Text:A 120 volts shunt motor draws a current of 75 Amperes at rated load. The armature and shunt field resistances are 0.52 and 502, respectively. A multi tap starter rheostat is inserted in the armature circuit to limit the starting current. If the rheostat has a resistance of 22, determine the percentage tap used such that the starting current will be limited to 150% of its full-load value.
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