A 125-kW, 250-V, 1800-rev/min, cumulative compound DC Generator has the following winding resistances: r, = 0.0250 r = 0.0102 r, = 302 The machine is long-shunt connected. Its stray-power loss at rated voltage and 1800 rev/min is 5000 W. When operated at rated speed, load, and terminal voltage, the shunt-field current is 5A. Find the efficiency and input horsepower requirements under these conditions.

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A 125-kW, 250-V, 1800-rev/min, cumulative compound DO Generator has the
following winding resistances:
r, = 0.0250 ree = 0.0100 r, = 302
The machine is long-shunt connected. Its stray-power loss at rated voltage and 1800
rev/min is 5000 W. When operated at rated speed, load, and terminal voltage, the
shunt-field current is 5A. Find the efficiency and input horsepower requirements under
these conditions.
Transcribed Image Text:A 125-kW, 250-V, 1800-rev/min, cumulative compound DO Generator has the following winding resistances: r, = 0.0250 ree = 0.0100 r, = 302 The machine is long-shunt connected. Its stray-power loss at rated voltage and 1800 rev/min is 5000 W. When operated at rated speed, load, and terminal voltage, the shunt-field current is 5A. Find the efficiency and input horsepower requirements under these conditions.
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