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

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

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Electrical Machines
In a transformer

 both Oc and SC tests are conducted on HV side
 OC test is conducted on HV side and SC test is conducted on LV side
 both OC and SC tests are conducted on LV side
 OC test is conducted on LV side and SC test is conducted on HV side

ANSWER DOWNLOAD EXAMIANS APP