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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 2.5Hz
 2HZ
 1 Hz

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Electrical Machines
Slip test is performed to determine

 direct axis reactance and quadrature axis reactance
All of these
 slip
 positive sequence reactance and negative sequence reactance

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of lamination on CRGO steel sheet.
  condition of paper insulation in transformer.
 condition of oil in transformer.
 condition of cork gaskets used in transformer.

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Electrical Machines
Which of the following represents the pitch factor?

 sin (α/2)
 Cos α²
 Cos α
 Cos (α/2)

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Electrical Machines
In DC generator, armature reaction refers to what?

  Effect of armature flux on the main field flux.
 Effect of field flux on the armature flux.
None of these
 Effect of armature flux on the load.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

 Resistance split phase motor
All of these
 Capacitor run motor
 Capacitor split phase motor

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