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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  aluminium.
  carbon.
  phosphor bronze.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Open slots.
  Semi closed slots.
  Closed slots.
  None of above.

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Electrical Machines
Commutator in DC generator is used for

 reduce losses
 increase efficiency
 convert AC armature current in to DC
 collecting of current

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Electrical Machines
Which motor cannot be started on no load?

 both B and C
 cumulative compound motors
 series motors
 shunt motors

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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

 440 A.
 44 A.
 40 A.
 400 A.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 5
 2, 3, 4
 1, 2, 3, 4
 1, 3, 5

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