Transformer Phasor Diagram MCQ

Test your knowledge with important Transformer Phasor Diagram MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Transformer Phasor Diagram MCQs at Bissoy

• Energising the transformer primary from a triangular wave flux makes the output voltage as __________
  ক

  square wave shifted by 90°

  খ

  a sine wave

  গ

  a triangular wave

  ঘ

  a square wave
• A 400/200V transformer has total resistance of 0.04 p.u on its L.V side. This resistance when referred to H.V side would be?
  ক

  0.04

  খ

  0.02

  গ

  0.01

  ঘ

  0.08
• In a single phase transformer,the no-load current lags the applied voltage by __________
  ক

  90°

  খ

  about 75°

  গ

  0

  ঘ

  about 110°
• Energizing the transformer primary from a triangular wave voltage source makes the output voltage as __________
  ক

  zero

  খ

  a sine wave

  গ

  a triangular wave

  ঘ

  a pulsed wave
• In case of a power transformer, the no load current in terms of rated correct is?
  ক

  10-20%

  খ

  2-6%

  গ

  15-20%

  ঘ

  30-50%
• We laminate transformer core to reduce ___________
  ক

  eddy current loss

  খ

  hysteresis loss

  গ

  both eddy current and hysteresis loss

  ঘ

  ohmic loss
• In an oil filled transformer, the application of oil is for ___________
  ক

  cooling

  খ

  insulation

  গ

  both cooling and insulation

  ঘ

  preventing the accumulation of dust
• Considering a transformer at no load is excited at rated voltage. A small recognizable gap is made in the yoke of the limbs. With this altercation, the transformer core flux ___________
  ক

  will decrease and magnetizing current will increase

  খ

  will remain constant and magnetizing current will increase

  গ

  as well as magnetizing current will increase

  ঘ

  as well as magnetizing current both will decrease
• A transformer has sometimes more than two ratings depending upon the use of ___________
  ক

  the cooling application

  খ

  type of windings

  গ

  type of core

  ঘ

  type of insulation to be given
• In an ideal transformer, the impedance can be transformed from one side to the other ___________
  ক

  in direct proportion to square of turns-ratio

  খ

  in direct proportion to turns-ratio

  গ

  in inverse proportion to square turns-ratio

  ঘ

  in inverse proportion to turns-ratio
• If a transformer is fed from a 220V and dc supply rather than a 1-phase ac supply, then the transformer will ___________
  ক

  burn its windings

  খ

  operate normal

  গ

  will not operate

  ঘ

  will give very small leakage flux
• Transformer action requires a ___________
  ক

  constant magnetic flux

  খ

  increasing magnetic flux

  গ

  alternating magnetic flux

  ঘ

  alternating electric flux
• The non linear magnetization curve of a practical transformer will introduce _____________
  ক

  heating

  খ

  higher order harmonics

  গ

  magnetostriction

  ঘ

  all of the mentioned
• The output voltage seen at the CRO connected at the secondary terminals is square wave. Then the flux density used for energizing the primary is?
  ক

  triangular

  খ

  sinusoidal

  গ

  saw tooth wave

  ঘ

  square wave