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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

None of these
 both 1 and 2
 below rated speed
 above rated speed

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Electrical Machines
Which motor cannot be started on no load?

 both B and C
 cumulative compound motors
 series motors
 shunt motors

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  any of above methods.
  using a flywheel.
  providing damper winding in the rotor pole faces.
  designing the motor for adequate synchronizing power.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.87
 1.06
 0.96
 0.95

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

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

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 1440, 1500.
 50, 1500.
  60, 1500.
 60, 1440.

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