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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 100 Ω
 0.1 Ω
 10 Ω
 50 Ω

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in parallel with the shunt field
 in parallel with the series field
 in series with the series field
 in series with the shunt field

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Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
 DC shunt motors.
None of these
 DC series motors.

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

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

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 through inductive coupling
 either of these depending on the design of the motor
 in series
 in parallel

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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,

  12.
 7.
 4.
 3.

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