Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 all of these.
 over load.
 zero or very low voltage supply.
 high filed circuit resistance.

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Electrical Machines
Cogging of induction motor occurs at

 high voltage and when stator and rotor poles are equal.
 high voltage and when stator and rotor poles are not equal.
 low voltage and when stator and rotor poles are not equal.
 low voltage and when stator and rotor poles are equal.

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Electrical Machines
No load primary current in a transformer

 leads the applied voltage by exactly 90Â&
 lags behind applied voltage somewhat less than 90Ã
 lags behind applied voltage by exactly 90Â&am
 leads the applied voltage somewhat less than 90Ã&

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