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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 44 A.
 40 A.
 440 A.
 400 A.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 60, 1440.
  60, 1500.
 1440, 1500.
 50, 1500.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

  reactance voltage.
 high resistance of carbon brushes.
 presence of commutator.
 armature reaction.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

  Shunt.
 Cummulative compound.
 Series.
 Differntical compound.

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Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Resistance split phase
 Capacitor run
 Capacitor start

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Electrical Machines
The direction of rotation of a DC motor can be determent by

 Flemings right hand rule.
 Lenzs law.
 Amperes law.
  Flemings left hand rule.

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