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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - star
 Star - delta
 Delta - delta

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

 44.47 Amp.
  43 Amp.
  33.33 Amp.
 29 Amp.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

 1.
  slip X 50 / 3.
  slip X 69 / 3.
  slip X 59 / 3.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 1
 10
 100

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Electrical Machines
Which of the following is the largest conversion device?

 Induction machine
All of these
 Synchronous machine
 DC machine

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage
 supply voltage and load
 supply voltage, frequency and load
 supply voltage and frequency

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