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Electrical Machines

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

 440 A.
 44 A.
  40 A.
 400 A.

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Electrical Machines
The reduced air gap results in an increase

  starting torque.
  cost of operation.
  breaking torque.
  power factor.

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 2.74 Ω.
 25.564 Ω.
 2.781 Ω.
  2.241 Ω.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using soft material for winding.
 increasing the number of turns.
 using transformer oil of better quality.
 using the magnetic core of low reluctance.

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Electrical Machines
Damper winding is used to

 suppress the hunting.
 increase the load current.
 decrease the load current.
 both 1 and 2.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  depends on the material of stator and the rotor.
  air gap does not matter.
  as wide as possible.
  as small as possible.

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MORE MCQ ON Electrical Machines

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