AC Motor Systems MCQ

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• The unit of angular acceleration is Joule.
  ক

  True

  খ

  False
• The principle of Boost converter can be applied for the regenerative braking.
  ক

  True

  খ

  False
• Calculate the output voltage of the Buck-Boost converter if the supply voltage is 78 V and duty cycle value is .1.
  ক

  7.2 V

  খ

  4.5 V

  গ

  8.6 V

  ঘ

  5.1 V
• Calculate the output voltage of the Boost converter if the supply voltage is 8 V and duty cycle value is .6.
  ক

  40 V

  খ

  20 V

  গ

  48 V

  ঘ

  51 V
• Calculate the output voltage of the Buck converter if the supply voltage is 11 V and duty cycle value is .4.
  ক

  4.4 V

  খ

  2.2 V

  গ

  4.8 V

  ঘ

  6.4 V
• Calculate the value of Crest factor if Vpeak=12 V and Vr.m.s=24 V.
  ক

  .2

  খ

  .3

  গ

  .4

  ঘ

  .5
• Calculate peak-peak voltage if Vmax=80 V and Vmin=20 V.
  ক

  60 V

  খ

  50 V

  গ

  70 V

  ঘ

  10 V
• Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 110° and supply frequency is 50 Hz.
  ক

  3.8 msec

  খ

  5.2 msec

  গ

  9.3 msec

  ঘ

  8.7 msec
• Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 20° and supply frequency is 60 Hz.
  ক

  8.8 msec

  খ

  7.4 msec

  গ

  10.1 msec

  ঘ

  6.5 msec
• In 3-Φ Semi-controlled rectifier calculate the average value of the voltage if the supply is 440 V and firing angle is 22°.
  ক

  571.5 V

  খ

  572.8 V

  গ

  548.3 V

  ঘ

  524.1 V
• Calculate the value of THD value for 3-Φ Fully controlled rectifier.
  ক

  48.43 %

  খ

  47.25 %

  গ

  39.26 %

  ঘ

  31 %
• Calculate the value of the Input power factor for 3-Φ Fully controlled rectifier if the firing angle value is 70°.
  ক

  .32

  খ

  .38

  গ

  .31

  ঘ

  .33
• In 3-Φ Fully controlled rectifier calculate the average value of the voltage if the supply is 400 V and firing angle is 15°.
  ক

  521.2 V

  খ

  522 V

  গ

  523 V

  ঘ

  524 V
• Calculate the pulse number if the supply frequency is 2π and the output frequency is π÷3.
  ক

  4

  খ

  2

  গ

  6

  ঘ

  8
• Calculate the output frequency for the two-pulse converter if the supply frequency is 20 Hz.
  ক

  40 Hz

  খ

  20 Hz

  গ

  60 Hz

  ঘ

  90 Hz