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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 4KVA
 0KVA
 16KVA
 20KVA

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Armature control.
 Field control.
 Ward-Leonard control.
 Multiple voltage control.

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the field current.
 Increasing the armature current.
 Increasing the field current.
 Decreasing the field current.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 3.2% and -1.6%
None of these
 6% and -4%
 4.8% and -3.2%

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Electrical Machines
Wave winding is employed in DC machine of

 low current and low voltage rating.
  low current and high voltage rating.
 high current and low voltage rating.
 high current and low voltage rating.

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 decreases
 increases
None of these
 remains unaffected

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