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Electrical_Power_Drivers-_ET3026WB-Chapt14_example_questions

Electrical_Power_Drivers-_ET3026WB-Chapt14_example_questions...

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Most questions are of increased difficulty 14.10 A standard squirrel cage induction motor rated at 50hp, 440V, 60Hz, 1150r/min is connected to a 208V, 3 phase line. By how much are the breakdown torque and locked rotor torque altered? a) 47%. b) 22%. c) 212%. d) 448%. 14.11 (1) A 3 phase squirrel cage induction motor having a rated voltage of 575V, is connected to a 520V line. What is the change in the locked rotor current? a) 82%. b) 111%. c) 90%. d) 122%. 14.11 (2) A 3 phase squirrel cage induction motor having a rated voltage of 575V, is connected to a 520V line. What is the change in the locked rotor torque? a) 82%. b) 111%. c) 90%. d) 122%. 14.14 (1) A 300hp, 2300V, 3 phase, 60Hz squirrel cage induction motor turns at a full load speed of 590r/min. What is the approximate value of the rotor I 2 R losses? a) 3.8kW. b) 223kW. c) 227kW.
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d) 300kW. 14.14 (2) A 300hp, 2300V, 3 phase, 60Hz squirrel cage induction motor turns at a full load speed of 590r/min. The line voltage drops to 1944V. What is the new speed, knowing that the load torque remains the same?
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