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A 3-phase, 380 V, 50 Hz , 6 pole, Y-connected induction motor has R, = 0.1 2, x, = 0.4 2, R, = 0.12 Q, X, = 0.4 2, X = 20 Q, P, = 1 kW. The motor is operated at 970 rpm. 1. The output shaft torque is: O A) 161 Nm O B) 150 Nm O C) 295 Nm O D) 188 Nm O C)None 2. The efficiency is: O A) 91.4% O B) 86.5% O C) 89.3% O D) 87.2% O C)None 3. The ratio of the stator starting current to full-load current (Ilart / luload) is : O A) 5.76 O B) 6.12 O C) 4.66 O D) 4.98 O C)None 4. The maximum developed torque is: O A) 735 Nm O B) 467 Nm O C) 383 Nm O D) 551 Nm O C)None 5. The speed (in rpm) at which maximum torque occurs is O A) 1206 O B) 850 O C) 1290 O D) 822 O C)None

A 3-phase, 380 V, 50 Hz , 6 pole, Y-connected induction motor has R, = 0.1 2, x, = 0.4 2, R, = 0.12 Q, X, = 0.4 2, X = 20 Q, P, = 1 kW. The motor is operated at 970 rpm. 1. The output shaft torque is: O A) 161 Nm O B) 150 Nm O C) 295 Nm O D) 188 Nm O C)None 2. The efficiency is: O A) 91.4% O B) 86.5% O C) 89.3% O D) 87.2% O C)None 3. The ratio of the stator starting current to full-load current (Ilart / luload) is : O A) 5.76 O B) 6.12 O C) 4.66 O D) 4.98 O C)None 4. The maximum developed torque is: O A) 735 Nm O B) 467 Nm O C) 383 Nm O D) 551 Nm O C)None 5. The speed (in rpm) at which maximum torque occurs is O A) 1206 O B) 850 O C) 1290 O D) 822 O C)None

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Solve parts (4)&(5)

A 3-phase, 380 V, 50 Hz , 6 pole, Y-connected induction motor has R, = 0.1 2, x, = 0.4 2, R, = 0.12 Q, X, = 0.4 2, X = 20 Q, P, = 1 kW. The motor is operated at 970 rpm. 1. The output shaft torque is: O A) 161 Nm O B) 150 Nm O C) 295 Nm O D) 188 Nm O C)None 2. The efficiency is: O A) 91.4% O B) 86.5% O C) 89.3% O D) 87.2% O C)None 3. The ratio of the stator starting current to full-load current (Ilart / luload) is : O A) 5.76 O B) 6.12 O C) 4.66 O D) 4.98 O C)None 4. The maximum developed torque is: O A) 735 Nm O B) 467 Nm O C) 383 Nm O D) 551 Nm O C)None 5. The speed (in rpm) at which maximum torque occurs is O A) 1206 O B) 850 O C) 1290 O D) 822 O C)None
Transcribed Image Text:A 3-phase, 380 V, 50 Hz , 6 pole, Y-connected induction motor has R, = 0.1 2, x, = 0.4 2, R, = 0.12 Q, X, = 0.4 2, X = 20 Q, P, = 1 kW. The motor is operated at 970 rpm. 1. The output shaft torque is: O A) 161 Nm O B) 150 Nm O C) 295 Nm O D) 188 Nm O C)None 2. The efficiency is: O A) 91.4% O B) 86.5% O C) 89.3% O D) 87.2% O C)None 3. The ratio of the stator starting current to full-load current (Ilart / luload) is : O A) 5.76 O B) 6.12 O C) 4.66 O D) 4.98 O C)None 4. The maximum developed torque is: O A) 735 Nm O B) 467 Nm O C) 383 Nm O D) 551 Nm O C)None 5. The speed (in rpm) at which maximum torque occurs is O A) 1206 O B) 850 O C) 1290 O D) 822 O C)None
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