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A three phase squirrel cage induction motor has a starting current of seven times the full load current and full load slip of 5%.
[1] If an autotransformer is used for reduced voltage starting to provide 1.5 per unit starting torque, the autotransformer ratio (%) should be
[2 marks]
(A) 57.77%
(B) 72.56%
(C) 78.25%
(D) 81.33%[2] If a star-delta starter is used to start this induction motor, the per unit starting torque will be [2 marks]
(A) 0.607
(B) 0.816
(C) 1.225
(D) 1.616[3] If a starting torque of 0.5 per unit is required then the per unit starting current should be [2 marks]
(A) 4.65
(B) 3.75
(C) 3.16
(D) 2.13asked in Electrical Engineering, 2007
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