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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  phosphor bronze.
  stainless steel.
  aluminium.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

None of these
 Magnetization
 Demagnetization
 Cross magnetization

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 turn- ratios are exactly equal
 polarities are properly connected
 KVA ratings are equal
 percentage impedances are equal

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
 both 1 and 2
None of these
 power factor of load

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC series motor.
 DC shunt motor with armature resistance.
 DC compound motor.
 DC shunt motor with field weaking control.

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 50 Hz
 0 Hz
 25 Hz

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