Electrical Machines
Tertiary winding in a transformer is mostly

  delta connected.
 star connected.
 zig - zag star connected.
 zig - zag delta connected.

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

  interchanging two supply phases for quick stopping.
  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.

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Electrical Machines
A belt-driven cumulatively-compound dc generator is delivering power to the dc mains. If the Belt snaps then the machine will run as a

 differentially compounded motor in the opposite direction
 differentially compounded motor in the same direction
 cumulative compounded motor in the same direction
 cumulative compounded motor in opposite direction

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