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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
  0.5 ohm.
 50 ohm.
 100 ohm.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Open fuse or circuit breaker.
 Produce sparking at brushes.
  Develop excessive speed and damage itself.
 Draw too much current.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Series.
  Compound.
  Separately excited.
 Shunt.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

 127 A.
 173 A.
  190 A.
 240 A.

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Electrical Machines
Which of these types of motor is self starting?

  Single phase induction motor.
  Poly-phase synchronous machine.
  Poly-phase induction motor.
  None of these.

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 10%
 21%
 11%
 41%

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