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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Compound.
  Shunt.
  None of them.
  Series.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 6 V
 240 V
 474 V
 234 V

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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
 2, 4, 5
 1 , 3, 5
 1, 4,5

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1/S
 1-S
 S
 2-S

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Electrical Machines
During hunting of a synchronous motor

  field excitation increases.
  negative phase sequence currents are generated.
  harmonic are developed in the armature circuit.
  damper bar develops torque.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 3 %.
  3.33 %.
None of these
 0 .001 %.

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