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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 28 W.
 25 W.
 30 W.

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Electrical Machines
Which of the following is not a part of transformer?

 Tap changer.
  Commutator.
 Conservator tank.
 Radiator.

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 541.67V, 250 rpm.
 2166.67V, 270 rpm.
 2166.67V, 230 rpm.
 541.67V, 200 rpm.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imax.
 Vmax to Imax.
 Vmax to Imin.
 Vmin to Imin.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  air gap does not matter.
  depends on the material of stator and the rotor.
  as small as possible.
  as wide as possible.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the shunt field
 in parallel with the series field
 in series with the series field
 in parallel with the shunt field

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