Electrical_Power_Drivers-_ET3026WB-Chapt15_example_questions

# Electrical_Power_Drivers-_ET3026WB-Chapt15_example_questions...

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Questions from the same exercise can be combined together to increase difficulty. Example 15 1 (r 1 ) A no load test conducted on a 30hp, 835rpm, 440V, 3 phase, 60Hz squirrel cage induction motor shown below yielded the following results: No load voltage (line to line): 440V No load current: 14A No load power: 1470W Resistance measured between two terminals: 0.5 Ω The locked rotor test conducted at reduced voltage gave the following results: Locked rotor voltage (line to line): 153V Locked rotor power: 7200W Locked rotor current: 60A What is the value of r 1 ? a) 0.5 Ω . b) 0.25 Ω . c) 31.4 Ω . d) 2.55 Ω . Example 15 1 (X m ) A no load test conducted on a 30hp, 835rpm, 440V, 3 phase, 60Hz squirrel cage induction motor shown below yielded the following results: No load voltage (line to line): 440V

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No load current: 14A No load power: 1470W Resistance measured between two terminals: 0.5 Ω The locked rotor test conducted at reduced voltage gave the following results: Locked
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