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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 3KW
 2KW
 1.5KW
 0.5Kw

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Electrical Machines
Slot wedges in a dc machine is made up of

 cast iron.
 silicon steel.
 mild steel.
 fibre.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 115 V
 460 V
 65 V
 230 V

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Power factor and field current.
 Torque and field current.
 Armature current and torque.
  Armature current and field current.

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Electrical Machines
Conservator tank is used

 to act as an oil storage.
None of these
 to take up the expansion of oil due to temperature rise.
 for better cooling of transformer.

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and low voltage
 low current and high voltage
 low current and low voltage
 high current and high voltage

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