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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd = Xq.
None of these
 Xd < Xq.
 Xd > Xq.

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Electrical Machines
Slip exists in

  none of above.
  in both machines.
  synchronous motor.
  induction motor.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 sinusoidal
 flat-topped
 co- sinusoidal

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 reduce by 5 %.
 remain unchanged.
 depend on other factors.
 increase by 5 %.

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 59.2%.
 48.0%.
 57.1%.
 88.8%.

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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 will

 remains same.
 none of these.
 Decrease.d
 increase.

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