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Electrical Machines

Electrical Machines
Which of the following relation is correct?

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

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 draw too much current.
 develop excessive speed and damage itself.
 produce sparking at brushes.
 open fuse or circuit breaker.

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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?

 40 V.
 60 V.
 90 V.
 30 V.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
  It will becomes four times.
  It will be halved.
 It will remain the same.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 2
 4 and 2
 2 and 1
 4 ang 1

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Electrical Machines
Which type motors are preferred for lathes?

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

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