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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P.
  P and Z.
  none of these.
  Z.

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Electrical Machines
What is the effect of armature reaction ?

  Both option B and C.
 Armature flux weakens the main field flux.
 Armature flux distorts the main field flux.
 None of the options.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Copper losses
 Eddy current losses
 Hysteresis losses
 Both 1 and 2

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 commutation
 electromechanical energy conversion
 generation of voltage
 development of torque

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Single phase induction motor.
  DC series motor.
  AC slip ring motor.
  Synchronous motor.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 36°
 30°
 18°
 72°

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