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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
 0.3.
  1.
 0.7.

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

 20KVA
 16KVA
 0KVA
 4KVA

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv2.
 Bl2v2.
 Bl2v.
 Blv.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 co- sinusoidal
 rectangular
 sinusoidal
 flat-topped

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Electrical Machines
Which of the following alternators contain large number of poles?

 Turbo alternators.
 Hydro alternators.
None of these
 Aame in both alternators.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/√2
 1/√5
 1/3
 2/√5

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