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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2
 (V2 - E2) / E2

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Electrical Machines
Equalizer rings are used in which of the followings?

 lap winding
 wave winding
 both 1 and 2
None of these

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Electrical Machines
During hunting of a synchronous motor

  field excitation increases.
  negative phase sequence currents are generated.
  harmonic are developed in the armature circuit.
  damper bar develops torque.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 975 rpm
 1000 rpm
 950 rpm
 940 rpm

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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
 50 KVA
 100 KVA
 123.3 KVA

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Electrical Machines
Hysteresis loss is proportional to

 f3.
  f.
 f2.
 f1.5.

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