Approximate Circuit of Transformer MCQ

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• Final approximate equivalent circuit contains _________
  ক

  Only equivalent X series branch

  খ

  Only equivalent Z series branch

  গ

  Only equivalent R series branch

  ঘ

  Any of the above
• In approximate equivalent circuit of the transformer _______________
  ক

  All resistances and inductances are lumped before magnetizing branch

  খ

  All resistances and inductances are lumped after magnetizing branch

  গ

  Resistances and inductances aren’t changed

  ঘ

  Any of the above will work
• Exciting current in an electrical transformer will not be affected much if primary is excited with E rather than V.
  ক

  True

  খ

  False
• In constant frequency (50 Hz) power transformers, approximate form is used with ___________
  ক

  π equivalent model

  খ

  T equivalent model

  গ

  π and T equivalent both

  ঘ

  Another model
• Which winding of the transformer has less cross-sectional area?
  ক

  Primary winding

  খ

  Secondary winding

  গ

  Low voltage winding

  ঘ

  High voltage winding
• The value of flux involved in the emf equation of a transformer is _______________
  ক

  average value

  খ

  rms value

  গ

  maximum value

  ঘ

  instantaneous value
• The use of higher flux density in the transformer design ________________
  ক

  reduces weight per kVA

  খ

  reduces iron losses

  গ

  reduces copper losses

  ঘ

  increases part load efficiency
• If R is the resistance of secondary winding of an electrical transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be _________
  ক

  R/VK

  খ

  R/K2

  গ

  R2/K2

  ঘ

  R2/K