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Electrical Machines

Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
 Iron loss
 Copper loss
All of these

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 205 V.
 212 V.
  201.02 V.
 210 V.

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Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 Universal motor.
 Partial motor.
 DC shunt motor.

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Electrical Machines
_____________ types of induction motor are widely used.

  Three phase IM.
  Single phase IM.
  Squirrel cage IM.
  Slip ring IM.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 shunt field
 none of above
 both A and B
 armature circuit

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 6 KVA
 10 KVA
 0 KVA
 4 KVA

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