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Electrical Machines

Electrical Machines
Example of double excited machine is

None of these
 Synchronous motor.
 Both are correct.
 DC Shunt Motor

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Electrical Machines
Cross magnetization effects which of the following?

 both 2 and 3
 commutation
 reduction in main field flux
 reduces the terminal voltage

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 increase
 either increase or decrease
None of these
 decrease

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  1.0.
  0.1.
  0.5.
  0.05.

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Electrical Machines
Tappings of a transformer are provided

 at the phase end of lv side
 at the neutral side end of hv side
 at the middle of hv side
 at the phase end of hv side

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Electrical Machines
An unexcited single phase synchronous motor is

 repulsion motor.
 AC series motor.
  universal motor.
 reluctance motor.

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