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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 V²
 1/V²
 1/V
 supply voltage V

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  1960 Watt.
 1920 Watt.
  980 Watt.
 1800 Watt.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

  Decrease.
 Increase.
 Remains same.
 None of these.

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 20°
 30°
 18°
 60°

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1450W
 2000W
 1820W
 1920W

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  √Ia.
  Ia.
  1/Ia.

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