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Electrical Machines

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

 positive.
 low.
 negative.
  zero.

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Electrical Machines
Which of the following motors is/are widely used?

None of these
 slip ring induction motor
 squirrel cage induction motor
 either of these

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 384 V
 768 V
 192 V
 96 V

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

 pure resistive load
 pure capacitive load
 pure inductive load
None of these

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/4Sp²
 PZL/4Sa²
 PZL/ 4Sa
 PZL/4S

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Electrical Machines
Lamination of transformer core is made of

 wrought iron.
  cast iron.
 cast steel.
  silicon steel.

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