Question

A three phase squirrel cage induction motor has a starting current of
seven times the full-load current and full-load slip of 5%.
881. If an auto-transformer is used for reduced voltage starting to
provide 1.5 per unit starting torque, the auto-transformer ratio
(%) should be
(a) 57.77% (b) 72.56% (c) 78.25% (d) 81.33%



882. If a star-delta starter is used to start this induction motor, the per
unit starting torque will be
(a) 0.607 (b) 0.816 (c) 1.225 (d) 1.616




883. If a starting torque of 0.5 per unit is required then the
per
starting current should be
(a) 4.65 (b) 3.75 (c) 3.16 (d) 2.13
​

Answer 1

Answer:

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