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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 200 V
 460 V
 115 V

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 commutation.
 generation of voltage.
 electromechanical energy conversion.
 development of torque.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  differential compounded.
  over compounded.
  shunt.
  under-compounded.

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Electrical Machines
The direction of rotation of a DC motor can be determent by

  Flemings left hand rule.
 Amperes law.
 Flemings right hand rule.
 Lenzs law.

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 1 and 3
 2 and 3
 1 alone
 1 and 2

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Differential compound motor.
  Cumulative compound motor.
  Series motor.
  Shunt motor.

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