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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 0 Hz
 50 Hz
 100 Hz

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 vibrations.
 eddy electric current loss.
 hysteresis loss.
 copper loss.

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Electrical Machines
Armature reaction depends on which of the following?

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

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  120 volt.
  None of these.
 220.4 volt.
  218.5 volt.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy copper or aluminium bars placed in rotor slots.
  single phase winding.
  three phase winding.
  heavy short-circuited end rings.

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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
 1, 2, 3
 2, 3, 4, 5
 2, 3, 4

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