Power Electronics P-Diode Rectifiers-1 MCQ

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• A step-down delta-star transformer, with per-phase turns ration of 5, is fed from a 3-phase, 1100 V, 50 Hz source. The secondary of this transformer through a 3-pulse type rectifier feeds a R load of 10 Ω. Find the maximum value of the load current (phase).
  ক

  √2 x 22 A

  খ

  1 x 11 A

  গ

  √2 x 11 A

  ঘ

  1 x 22 A
• In a three-phase half wave 6-pulse mid-point type diode rectifier, each diode conducts for
  ক

  120°

  খ

  60°

  গ

  90°

  ঘ

  180°
• The average value of the output voltage, in a 3-phase half wave diode rectifier with Vml as the maximum line voltage value, is given by the expression
  ক

  Vml/3π

  খ

  2Vml/3π

  গ

  3Vml/2π

  ঘ

  3Vml
• In a three-phase half wave diode rectifier, if Vmp is the maximum phase voltage, then the output voltage on a R load varies from
  ক

  0 to Vmp

  খ

  0.5 Vmp to Vmp

  গ

  Vmp to 3Vmp

  ঘ

  –Vmp to Vmp
• In a three-phase half wave diode rectifier using 3 diodes,
  ক

  All diodes conduct together

  খ

  Only two diodes conduct at a time

  গ

  Only one diode conducts at a time

  ঘ

  None of the above mentioned
• In the below shown diode rectifier circuit, The diodes D1, D2 & D3 are connected to phases R,Y and B receptively as shown The phase sequence is R-Y-B. The diode D3 conducts from
  ক

  0 to 270 degrees

  খ

  270 to 390 degrees

  গ

  270 to 450 degrees

  ঘ

  270 to 360 degrees
• In the below shown diode rectifier circuit, The diodes D1, D2 & D3 are connected to phases R,Y and B respectively as shown The phase sequence is R-Y-B. The diode D1 would conduct from
  ক

  0 to 90 degrees

  খ

  30 to 150 degrees

  গ

  0 to 180 degrees

  ঘ

  30 to 180 degrees
• In a three-phase half wave diode rectifier using 3 diodes, each diode conducts for
  ক

  90 degrees

  খ

  120 degrees

  গ

  180 degrees

  ঘ

  360 degrees
• The diode rectifier circuit given below is that of a
  ক

  three-phase half wave common cathode arrangement

  খ

  three-phase half wave common anode arrangement

  গ

  three-phase full wave common cathode arrangement

  ঘ

  three-phase full wave common anode arrangement
• In a three-phase half wave rectifier usually, the primary side of the transformer is delta connected because
  ক

  it has no neutral connection

  খ

  we can get greater output voltage

  গ

  it provides a path for the triplen harmonics

  ঘ

  it provides better temperature stability