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Electrical Machines

Electrical Machines
Example of double excited machine is

 Synchronous motor.
 Both are correct.
None of these
 DC Shunt Motor

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 50 / 3.
 1.
  slip X 69 / 3.
  slip X 59 / 3.

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

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

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Electrical Machines
Resistance commutation is used generally in case of

None of these
  fractional kW DC machines.
 DC machines bellow 5 kW.
 DC machines above 10 kW.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 27 A.
 23 A.
  13.5 A.
 11.5 A.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1-S
 2-S
 1/S
 S

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