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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  wound.
  linear.
  cage.
  none of these.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 comulatively compounded motor
 series motor
 permanent magnet motor
 differentially compounded motor

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 0.1 µF.
 5 - 10 F.
  1 - 2 µF.
  2 - 3 µF.

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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 external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.9 Ω
 31.1 Ω
 31.9 Ω
 15.1 Ω

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

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

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 DC.
 A modulated supply frequency AC voltage with slip frequency envelop.
 AC of supply frequency.
  DC of slip frequency.

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