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Electrical Machines

Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 positive.
 low.
  zero.
 negative.

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
 half of the supply voltage.
All of these
 double the supply voltage.

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

 armature flux
 armature current
All of these
 armature mmf

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.72.
 1.24.
 0.62.
 0.25.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave controlled
 full wave
 full wave controlled
 half wave

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

  Back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.
 Back emf is equal.
 None of above.

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