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Electrical Machines

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

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

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

  190 A.
 173 A.
 127 A.
 240 A.

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Electrical Machines
Dynamic braking can be used for

All of these
 series motors.
 shunt motors.
 compound motors.

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

 20 N.
  15 N.
  None of these.
  Can't be determined.

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of number of pole.
  Change of supply frequency.
  Change of rotor resistance.
  Change of supply voltage.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 None of these.
 Increase.
  Decrease.
 Remains same.

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