Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

  increased.
 decreased.
 kept constant to certain value.
 remains same.

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Electrical Machines
In case of 3 - Φ IM, plugging means

  pulling the motor directly on line without a rotor.
  starting the motor on load which is more than the rated load.
  locking of rotor due to harmonics.
  interchanging two supply phases for quick stopping.

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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, 5
 1, 4, 5
 2,3
 1, 4

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