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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 0°
 70° to 85°
 90°
 25° to 30°

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Electrical Machines
Universal motors are used in

 traction
 food processing
 cranes
All of these

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 below rated speed
 both A and B
None of these

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Electrical Machines
Transformer core is laminated to reduce

 hysteresis loss.
 copper loss.
 eddy current loss.
 both 1 and 2.

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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,

 3.
  12.
 7.
 4.

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 750rpm
 1000 rpm
 1500 rpm
 zero speed

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