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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 350 V.
 420 V.
 480 V.
 400 V.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 48 Hz
 45 HZ
 48.5 Hz
 50 Hz

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Electrical Machines
Which of the following relation is correct?

 Xd < Xq.
 Xd = Xq.
 Xd > Xq.
None of these

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Electrical Machines
The use of higher flux density in the transformer design

 increases the weigh per KVA
 has no relation with the weight of transformer
None of these
 reduces the weigh per KVA

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 1200 A.
  3600 A.
 2400 A.
 600 A.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Shunt motor.
  Series motor.
  Cumulative compound motor.
  Differential compound motor.

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