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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - delta
 Star - star
 Star - delta
 Delta - star

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum current.
 maximum power.
 maximum voltage.
 no voltage.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of cork gaskets used in transformer.
  condition of paper insulation in transformer.
 condition of lamination on CRGO steel sheet.
 condition of oil in transformer.

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

  4 Ω.
 8 Ω.
  2 Ω.
 10 Ω.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 twice the initial value
 1/4 of the intial value
 4 time the initial value
 1/2 of the initial value

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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is

 14%.
 0%.
 7%.
  8.9%.

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