DC GENERATOR ONLINE EXAM* Name: __________________________________________________Date: _____________ Section: ___________ I. Multiple Choices: In the following items, write only the correct answer. (2 points each on 1-5 items) 1. Consist of series of coils embedded in slots in the pole faces a. Starting winding c. Compensating winding b. Compound winding d. Stator winding 2. A measure of how the voltage is, and when the load changes a. Voltage Regulation c. Efficiency b. Voltage Drop of the line d. Power Regulation 3. The purpose of diverter resistor is to a. increases the output power c. reduce the power of the generator b. increases the output voltage d. reduce the voltage of the generator 4. A generator with 4 poles and 440 armature conductors and wave constructed and 1 x 10 exp 6 lines of magnetic flux that were rotating at 3,000 rpm, then the output voltage is? a. 220 volts c. 440 volts b. 120 volts d. 110 volts 5. A four pole DC generator with lap winding has 48 slots and 4 elements per slot, how many coils does it have? a. 48 c. 384 b. 192 d. 96 6. A short-shunt compound dc generator supplies a load of 15 kW at 200-volts, through a pair of feeders of total resistance of 0.1-ohm, armature resistance of 0.04-ohm, series field resistance of 0.03-ohm and shunt field resistance of 80-ohm. The generated electromotive force is? (6 points) a..205.3-volts c. 212.8-volts b. 280.5-volts d.208.3-volts 7. A long-shunt compound generator has full load output of 100-kW at 250-volts. The armature resistance of 0.05ohm, series field resistance of 0.03-ohm and shunt field resistance of 55-ohm therefore the power dissipated to the armature and the generated voltage in the armature are? (6 points) a. 8,182.8-watts and 232.32-volts c. 114,227.3-watts and 232.32-volt b. 114.227.3-watts and 230.32-volts d. 8,182.8-watts and 230.32-volts, 8. A four-pole shunt generator has a lap connected armature with 728 conductors. The flux per pole is 25mWb. If the generator supplies two hundred fifty-75-watts incandescent lamp at 110-volt, the field and the armature resistance are 110-ohm and 0.025-ohm respectively. Determine the speed in RPM of the generator. (6 points) a. 2800 RPM c. 1800 RPM b. 377 RPM d. 477 RPM 9. The field current of a 180 kW, 250 Volts Shunt DC Generator is 6 A, when running full load at terminal voltage. If the combined armature and brush resistance is 0.02 ohm, solved for the electrical efficiency of the generator. (6 points) a. 92.13 % c. 93.73 % b. 94.05 % d. 91.87 % 10. A short shunt compound generator delivers 150-amp at a terminal voltage is 230-volt. The shunt filed current is 2.5-amp. The resistances of the armature, series field and diverter resistance are 0.032-ohm, 0.015-ohm and 0.03-ohm respectively. Calculate the efficiency of the generator? (6 points) a. 96.4 % c. 94.2 % b. 93.8 % d. 95.7 % This study source was downloaded by 100000825871136 from CourseHero.com on 09-17-2022 05:09:43 GMT -05:00 https://www.coursehero.com/file/113144626/DC-Generator-Exampdf/ Powered by TCPDF (www.tcpdf.org)
