Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  mechanical losses.
  hysteresis losses.
  ohmic losses.
  eddy current losses.

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Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

 Ph will increase but Pe will decrease
 both hysteresis loss(Ph) and eddy current loss(Pe) will increase
 Pe will increase but Ph will decrease
 Ph will decrease but Pe will remain same

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Electrical Machines
In a transformer

 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
 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

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