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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 burn.
 run at lower speed.
 run at normal speed.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 less than 90°
 0°
 90°
 Greater than 90°

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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/ 4Sa
 PZL/4Sp²
 PZL/4S
 PZL/4Sa²

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 4KVA
 0KVA
 16KVA
 20KVA

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Electrical Machines
Lamination of transformer core is made of

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

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 9/16.
 16/9.
 3/4.
 4/3.

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