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Electrical Machines

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

 16KVA
 0KVA
 4KVA
 20KVA

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 3 at 90°C.
 2 at 90°C.
 0.5 at 90°C.
  1 at 90°C.

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Electrical Machines
Which of the following is/are not a self starting motor?

 both 1 and 2
 3-phase induction motor
 1-phase induction motor
None of these

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 RBY
 BYR
All of these
 BRY

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ P.
 T ∝ √P.
 T2 ∝ P3.
 T is independent of P.

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Electrical Machines
Series generators are used in which of the following applications?

 Arc welding.
 Used as boosters in dc distribution or transmission.
 Air crafts.
All of these

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