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Electrical Machines

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

 440 A.
 40 A.
 44 A.
 400 A.

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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.

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

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

 1.5 %.
  zero.
  less than 1 %.
 4 %.

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 14.28%.
 16.67%.
 18.25%.
 15.30%.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Cumulative compound motors
 Shunt motor
 Series motor
 Differential compound motor

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 1000 W, 5040 W.
  3190 W, 5040 W.
 100 W, 2000 W.
 6000 W, 7000 W.

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