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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.
 400 A.
 40 A.
 44 A.

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

  Series.
 Shunt.
 Cummulative compound.
 Differentical compound.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 three.
 four.
 two.
 six.

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Electrical Machines
Induction motors have the advantage of

  simple in construction.
  all of below.
  less cost.
  less maintenance.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 50, s = 4.43 %.
  P = 20, s = 3.33 %.
  P = 60, s = 0.96 %.
  P = 40, s = 5.79 %.

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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 150 V.
 240 V.
 230 V.
 210 V

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