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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 2000 rpm
 250 rpm
 500 rpm
 1000 rpm

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 1.5Hz
 48.5Hz
 51.5Hz
 2.5Hz

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 7.
 3.
  12.
 4.

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

  PSC (permanent split capacitor) motor.
 Split phase motor.
 Shaded pole motor.
None of these

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 50 V.
 100 V.
 399 V.

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 In parallel with the armature winding.
 As a separate unit.
  In series with the armature winding.

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