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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

 10 %.
  2.5 %.
  15 %.
  20 %.

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Electrical Machines
Which type of motors uses slip rings?

 Induction motors
 Synchronous motors
 Both Synchronous and Induction motor
 DC Shunt Motor

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 2, 3, 5
 1, 4,5
 1 , 3, 5
 2, 4, 5

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 solid connection.
 slip rings.
 none of above.
 commutator.

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Electrical Machines
Field weakening method is also called as-----------?

 constant torque control
 constant voltage control
 constant current control
 constant power control

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 250 A.
 570 A.
 440 A.
 340 A.

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