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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 MNA
 either GNA or MNA
None of these

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V
 f²
 f
 V²

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

All of these
 power factor and supply voltage during hunting
 power factor and dc excitation at constant load
 supply voltage and field current at constant excitation

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
All of these
 half of the supply voltage.
 double the supply voltage.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.05.
  1.0.
  0.1.
  0.5.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 83.33 KVA
 123.3 KVA
 50 KVA
 100 KVA

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