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Electrical Machines

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

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

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 20, s = 3.33 %.
  P = 50, s = 4.43 %.
  P = 40, s = 5.79 %.
  P = 60, s = 0.96 %.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 72°
 30°
 18°
 36°

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Remain unaltered.
  Reduce.
  Oscillate around the normal speed.
  Increase.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3600 rpm.
  4000 rpm.
  3000 rpm.
  1500 rpm.

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
 power factor of load
None of these
 both 1 and 2

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MORE MCQ ON Electrical Machines

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