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Electrical Machines

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

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

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3 ,5
 2, 3, 4
 2, 3, 4, 5
 1, 2, 3

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  none of above.
  only field terminals are changed.
  only armature terminals are reversed.
  either field terminals are reversed or armature terminals are reversed.

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Electrical Machines
The power developed by salient pole synchronous machine is/are

None of these
 power due to saliency or reluctance only
 both 1 and 2
 excitation power only

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Electrical Machines
The reduced air gap results in an increase

  power factor.
  cost of operation.
  breaking torque.
  starting torque.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Cumulative compound motors
 Differential compound motor
 Shunt motor
 Series motor

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