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Electrical Machines

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

 2HZ
 1 Hz
 50Hz
 2.5Hz

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  reversed.
  none of these.
  increased.
  modified.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 0.96
 0.02, 0.98
 0.02, 1.98
 0.04, 1.96

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

 armature current
All of these
 armature flux
 armature mmf

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of parallel paths.
  number of commutator segments.
  number of pole pairs.
  number of poles.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The voltage across the terminals.
 The speed of motor.
 None of above.
 The torque required.

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