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Electrical Machines

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f
 f2
 V
 V2

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Electrical Machines
Which type motors are preferred for lathes?

 Either A or B.
 DC shunt motors.
 Synchronous motor.
 Squirrel Cage induction motor.

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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
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% increase
 36.36% decrease
 36.36% increase
 18.18% increase

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

  0.54 Ω.
 0.06 Ω.
 0.54 Ω.
 0.01 Ω.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 90 V.
 60 V.
 40 V.
 30 V.

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