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Electrical Machines

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 90o.
 0o.
 less than 90o.
 Greater than 90o.

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Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Lift.
  Traction.
  Food mixer.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

 800 Amp.
  400 Amp.
 320 Amp.
  0.5 Amp.

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Electrical Machines
The core flux in transformer depends mainly on

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

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Electrical Machines
At stand still condition the value of slip is

 finite value
 1
 0
 infinite value

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 400 A.
 44 A.
 440 A.
  40 A.

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