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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 2 to 3.
 3 to 5.
 1.0.
  1.5 to 2.

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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.

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

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Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - delta
 Delta - star
 Star - delta

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 23 A.
  13.5 A.
 27 A.
 11.5 A.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs Ia
 Eg vs load current
 Vt vs load current
 Vt vs Ia

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Shunt motor as well as compound motors.
  Series motor.
  Shunt motor.
  Shunt, compound and series motor.

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