Electrical Machines
During hunting of a synchronous motor

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

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Electrical Machines
A compound dc generator is delivering full load current at a terminal voltage of 230 V. Its series-field winding gets short circuited. If its terminal voltage 1. becomes more than 230 V, it is overcompounded generator 2. becomes more than 230 V, it is differentially compounded generator 3. becomes less than 230 V, it is overcompounded generator 4. becomes less than 230 V, it is differentially compounded generator 5. becomes less than 230 V, it is level compounded generator From these, the correct answer is

 2,3
 1, 4
 2, 3, 5
 1, 4, 5

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