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Electrical Machines

Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Yoke.
  Commutator.
 Brush.
 Armature.

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia remains constant but ωm increase
 Ia increases and ωm decreses
 both armature current Ia and speed ωm increase
 both decrese

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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.
  33.33 Amp.
  43 Amp.
 29 Amp.

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.8.
 0.4.
 0.6.
  1.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

  600 rpm.
 3000 rpm.
 500 rpm.
 3600 rpm.

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmin to Imin
 Vmax to Imax
 Vmax to Imin

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