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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 6 / 7.
  4 / 5.
 2 / 3.
 5 / 6.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 load test
 back to back test
None of these
 OC and SC tests

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

  a large starting torque.
 low noise.
 higher efficiency.
 reduced starting torque.

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Electrical Machines
Induction motors have the advantage of

  less maintenance.
  all of below.
  less cost.
  simple in construction.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 280 V.
 220 V.
 150 V.
 240 V.

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