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d) A, C View Answer Answer: a Explanation: Rotor resistance method can only be used with slip ring induction motor. 6. The method which employs reduction of the voltage while induction motor starting is/are A. DOL starting B. Auto transformer starting a) Only A b) A, B c) Only B d) Neither A nor B View Answer Answer: a Explanation: Direct online starting uses reduction in voltage. 7. The method which employs raising of the voltage while induction motor starting is/are A. DOL starting B. Auto transformer starting a) Only A b) A, B c) Only B d) Neither A nor B View Answer Answer: d Explanation: None of the starting methods use increase in the starting voltage. 8. External methods of induction motor starting is employed to a) Reduce the voltage b) Reduce the current c) improve efficiency d) all of the mentioned View Answer Answer: a Explanation: External methods like auto transformer is used to mainly reduce voltage. 9. A 3-phase, 4-pole, 50 Hz induction motor is uses DOL method of starting. It is later replaced by reactance method of starting with a fraction of ‘x’, then the starting current reduces by a) x b) x^2 c) 1/x d) no change in the starting current View Answer Answer: a Explanation: The current will be reduced by a fraction of x.
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