1- In an induction motor, no-load slip is generally- (a) Less than 1% (b) 2% (c) 4% (d) 5% 2- A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor current will be-------- (a) 50Hz (b) 25Hz (c) 5Hz (d) 2Hz 3- The efficiency of 3-phase induction motor is about (a) 100% (b) 80-90% -------- (c) 50-60% (d) Less than 50%
1- In an induction motor, no-load slip is generally- (a) Less than 1% (b) 2% (c) 4% (d) 5% 2- A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor current will be-------- (a) 50Hz (b) 25Hz (c) 5Hz (d) 2Hz 3- The efficiency of 3-phase induction motor is about (a) 100% (b) 80-90% -------- (c) 50-60% (d) Less than 50%
Chapter3: Magnetic Starters
Section: Chapter Questions
Problem 18SQ
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