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Electrical Machines

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

 0°
 25° to 30°
 90°
 70° to 85°

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 both of above.
None of these
 AC.
 DC.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea + Iara
 Vt = Ea + Iara+ ILrs
 Vt = Ea + Ia(ra + rs)
 Vt= Ea– Iara

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  facilitate cooling of rotor.
  none of these.
  balance the rotor dynamically.
  eliminate noise.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 1000W
 3000W
 100W
 500W

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will become slow.
 It will run in same direction.
  It will run in opposite direction.
 motor will not run.

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