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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f3.
 f2.
 f1.5.

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

  470 rpm.
 540 rpm.
  240 rpm.
 450 rpm.

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Electrical Machines
Regenerative braking is possible in

  DC shunt motor with field weakening control.
 DC compound motor.
 DC series motor.
 DC shunt motor with armature resistance control.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  0.5 Amp.
 800 Amp.
 320 Amp.
  400 Amp.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1440.
 1500.
 1450.
  1435.

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Electrical Machines
The armature resistance of the dc motor is generally of the range

 100 ohm.
  0.1 ohm.
 50 ohm.
  0.5 ohm.

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