The book Miscellaneous Tests of Electric Car Equipment was written by author Eugene Chilton Parham Here you can read free online of Miscellaneous Tests of Electric Car Equipment book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Miscellaneous Tests of Electric Car Equipment a good or bad book?
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With motors in full series, when the speed becomes uni- form, as indicated by the sound of the gears or by the steady needle of an ammeter placed in circuit for that purpose, read both meters; assum- ing the meters to be correct, if their readings are equal, the motors are balanced. 179. Note. If one meter indicates over 10% more than the other, conditions must be investi- gated by inspection. 180. Note. The sum of the readings cannot equal the voltage of the line, because fields, car- wires an...d contacts have resistance through which there will be some drop. On a number of cars tested at an average of 500 volts, each motor aver- aged from 235 volts to 240 volts. In one case one meter read 200 volts and the other 270 volts a difference of 35%. The motor with the lower voltage was found to have carbonized field coils. 181. Note. To tell if the difference in the readings exceeds 10 per cent, the per cent, differ- ence can be calculated as follows: 182. Rule. To calculate the per cent, difference in the readings of two meters, Divide the difference in the readings by the smaller reading, then mul- tiply by 100.
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