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Electrical Machines

Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 5 - 10 F.
  1 - 2 µF.
 0.1 µF.
  2 - 3 µF.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing number of poles.
  speed can not be increased.
  increasing of frequency.
  decreasing of frequency.

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Electrical Machines
DC series motor is best suited for electric traction as

 It runs at very high speed at light load.
 It is cheaper in cost.
 It consume less power.
  It develops high starting torque.

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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

 40 A.
 440 A.
 400 A.
 44 A.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To convert alternating supply current to direct current.
  None of these.
  To absorb the mechanical shocks produced during running condition.
  To increase the flux cutting by the rotor.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  s2.
  sf / 2.
  sf.

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MORE MCQ ON Electrical Machines

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