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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 2
 -2 < S < 2
 0 < S < 1
 -1 < S < 1

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 20 V
 40 V
 50 V
 zero

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

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

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

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

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Electrical Machines
In DC generator, armature reaction refers to what?

  Effect of armature flux on the main field flux.
 Effect of armature flux on the load.
None of these
 Effect of field flux on the armature flux.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 greater than
 less than
 any of the above

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