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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  none of these.
  EIa.
  EbIa.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 460 V
 230 V
 115 V
 65 V

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Electrical Machines
Use of fractional pitch winding

All of these
  results in reduced axial length of the machine.
  results in reduced leakage reactance.
  make it stiffer.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Copper losses
 Both 1 and 2
 Eddy current losses
 Hysteresis losses

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Electrical Machines
Fufuraldehyde analysis is done to determine the

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

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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

  1.2 mWb.
 3.5 mWb.
 1.4 mWb.
 2.7 mWb.

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