Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.5 p.u
  0.125 p.u
  0.25 p.u
  0.75 p.u

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Electrical Machines
In a transformer

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

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