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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
In a DC series generator, the terminal voltage with increase in load will

 decrease
 remain nearly constant
 increase to rated voltage and then may decrease
 increase gradually and then stay at rated voltage

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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

 88.8%.
 59.2%.
 48.0%.
 57.1%.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
 460 A.
 570 A.
 340 A.

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Electrical Machines
Generator works on the principle of production

 dynamically induced emf.
None of these
 both A and B.
 static induced emf.

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Electrical Machines
Hunting in a synchronous motor takes place

  when supply voltage fluctuates.
  when load varies.
  when power factor is unity.
  motor is under loaded.

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