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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -1 < S < 1
 -2 < S < 2
 0 < S < 2
 0 < S < 1

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

  unity.
 zero.
 two.
 infinity.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 6000 W, 7000 W.
 100 W, 2000 W.
 1000 W, 5040 W.
  3190 W, 5040 W.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 1Ω.
 0.25Ω.
 0.5Ω.
  0.23Ω.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  220 V.
  zero.
  about 2 V.
  about 50 V.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  series.
  any one of the connection.
  no resistance is connected.
  parallel.

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