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6. A 230 V shunt motor has a nominal arma- ture current of 60 A. If the armature resist- ance is 0.15 N, calculate the following: a. The counter-emf [V] b. The power supplied to the armature [W] c. The mechanical power developed by the motor, [kW] and [hp] 10 a. In Problem 9 calculate the initial starting current if the motor is directly connected across the 230 V line. b. Calculate the value of the starting resistor needed to limit the initial current to 115 A. Intermediate level

6. A 230 V shunt motor has a nominal arma- ture current of 60 A. If the armature resist- ance is 0.15 N, calculate the following: a. The counter-emf [V] b. The power supplied to the armature [W] c. The mechanical power developed by the motor, [kW] and [hp] 10 a. In Problem 9 calculate the initial starting current if the motor is directly connected across the 230 V line. b. Calculate the value of the starting resistor needed to limit the initial current to 115 A. Intermediate level

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Explain is meant by the ef- Name of de and a voltage re 1500 r/mi: Questions and Problems 13 The follov 250 hp, 2: Practical Level sketch of the connections. nominal f insulatior fect in a motor. What determines the magnitude and polarity 3. weight: 3 external length of The counter-emf of a motor is always slightly less than the applied armature volt- age. Explain. a. Calcu at full Name two methods that are used to vary the 5. speed of a dc motor. b. Calcu exciti Explain why the armature current of a shunt 6. motor decreases as the motor accelerates. 20 pe c. Calcu resist Why is a starting resistor needed to bring a 7. motor up to speed? know at ful 8 Show one way to reverse the direction of ro- tation of a compound motor. d. If we what 6. A 230 V shunt motor has a nominal arma- ture current of 60 A. If the armature resist- curre 14 We wis ance is 0.15 N, calculate the following: a. The counter-emf [V] b. The power supplied to the armature [W] c. The mechanical power developed by the motor, [kW] and [hp] 10 a. In Problem 9 calculate the initial starting motor b shown i current a. The wan current if the motor is directly connected across the 230 V line. b. Calculate the value of the starting resistor cur b. The has needed to limit the initial current to 115 A. Intermediate level 15 a. The The compound motor of Fig. 12 has 1200 turns on the shunt winding and 25 turns on the by u Cale the
Transcribed Image Text:Explain is meant by the ef- Name of de and a voltage re 1500 r/mi: Questions and Problems 13 The follov 250 hp, 2: Practical Level sketch of the connections. nominal f insulatior fect in a motor. What determines the magnitude and polarity 3. weight: 3 external length of The counter-emf of a motor is always slightly less than the applied armature volt- age. Explain. a. Calcu at full Name two methods that are used to vary the 5. speed of a dc motor. b. Calcu exciti Explain why the armature current of a shunt 6. motor decreases as the motor accelerates. 20 pe c. Calcu resist Why is a starting resistor needed to bring a 7. motor up to speed? know at ful 8 Show one way to reverse the direction of ro- tation of a compound motor. d. If we what 6. A 230 V shunt motor has a nominal arma- ture current of 60 A. If the armature resist- curre 14 We wis ance is 0.15 N, calculate the following: a. The counter-emf [V] b. The power supplied to the armature [W] c. The mechanical power developed by the motor, [kW] and [hp] 10 a. In Problem 9 calculate the initial starting motor b shown i current a. The wan current if the motor is directly connected across the 230 V line. b. Calculate the value of the starting resistor cur b. The has needed to limit the initial current to 115 A. Intermediate level 15 a. The The compound motor of Fig. 12 has 1200 turns on the shunt winding and 25 turns on the by u Cale the
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