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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  run normally.
  not run.
  get over heated.
  make noise.

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

  240 rpm.
 540 rpm.
 450 rpm.
  470 rpm.

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and low voltage
 low current and low voltage
 high current and high voltage
 low current and high voltage

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imax
 Vmin to Imax
 Vmin to Imin
 Vmax to Imin

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 0 V.
 60 V.
 20 V.

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Electrical Machines
Copper brushes in DC machine are used

 in both of above cases.
None of these
 where low voltage and high currents are involved.
 where high voltage and low current.

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MORE MCQ ON Electrical Machines

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