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Electrical Machines

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

  1.
 0.7.
 0.3.
  0.54.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 3 %.
None of these
  3.33 %.
 0 .001 %.

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Electrical Machines
What is the effect of armature reaction ?

  Both option B and C.
 Armature flux weakens the main field flux.
 None of the options.
 Armature flux distorts the main field flux.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 95%
 94%
 96%
 92%

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and underecited
 lightly loaded and over excited
 heavily loaded and over excited
 heavily loaded and underexcited

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage
 supply voltage and frequency
 supply voltage, frequency and load
 supply voltage and load

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