Electrical Machines
Armature reaction effect is more in which of the following methods?

 same in both methods
 field weakening method
 armature resistance control
None of these

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Electrical Machines
Where the shunt generators are widely used?

 Where the load is very high.
  Where a constant voltage is required over a narrow load range.
 Where often load fluctuation is occurred.
 Where voltage variation is needed over a wide load range.

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Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

 field winding was wrongly connected
 there was a break in the armature circuit
 field resistance was higher than critical resistance
 there was no residual magnetism in the field circuit

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