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Electrical Machines

Electrical Machines
The principle of dynamically induced emf is utilized in

 choke.
 thermocouple.
 generator.
 transformer.

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Electrical Machines
Scott connections are used for

 three phase to two phase transformation.
 single phase to three phase transformation.
 any of the above.
 three phase to single phase transformation.

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Electrical Machines
A DC generator can be considered as

 rectifier.
 power pump.
 prime mover.
 rotating amplifier.

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Electrical Machines
The field system of an alternator is usually excited

  110 / 220 V AC.
  3 - Φ, 50 Hz and 400 V.
  230 V AC.
  250 / 250 V DC.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 50Ω
 100Ω
 200Ω
 10Ω

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 420 V.
 350 V.
 400 V.
 480 V.

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