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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 V²
 applied voltage V
 1/V²
 1/V

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Electrical Machines
Open circuit test on transformer gives

 copper loss
 both 1and 2
 eddy current loss
 hysteresis loss

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Electrical Machines
What are the starters used for starting of cage motors?

 Auto transformer starter.
  All of these.
 DOL starter.
 Star-delta starter.

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Electrical Machines
If the excitation is reduced, the power factor is

 lagging power factor
None of these
 unity power factor
 leading power factor

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 not changed
 decrease
 increase
None of these

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

 cooling the armature.
  increasing the input to the prime mover.
  reducing the load voltage.
  increasing the excitation.

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