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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 either increase or decrease
 decrease
 increase
None of these

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 25 ppm.
 20 ppm.
  35 ppm.
 45 ppm.

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

None of these
  stator winding.
  either stator winding or rotor winding.
  rotor winding.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cos2δ
 sinδ
 cosδ
 sin2δ

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 equal to core loss.
 less than core loss.
  more than core loss.
 zero.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Split phase.
  Repulsion.
  Universal.
  Capacitor run.

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