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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 half load
 any of the above
 full load
 no load

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 8 Ω.
  2 Ω.
 10 Ω.
  4 Ω.

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Electrical Machines
Transformer core is laminated to reduce

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

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Electrical Machines
In shapers and slotters which motor are preferred?

  Slip ring IM.
  Synchronous motor.
  Double cage motor.
  Squirrel cage IM.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 2 .1 Ω
 1.8 9 Ω
 3.1 Ω
 1.79 Ω

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 2 V.
  about 50 V.
  zero.
  220 V.

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