Rotor Voltage Injection MCQ

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• Calculate mark to space ratio if the system is on for 4.3 sec and off for 78.2 sec.
  ক

  .054

  খ

  .047

  গ

  .039

  ঘ

  .018
• Calculate the total heat dissipated in a rotor resistor of 14.23 Ω when .65 A current flows through it.
  ক

  6.45 W

  খ

  6.01 W

  গ

  6.78 W

  ঘ

  6.98 W
• Calculate the active power in a .89 H inductor.
  ক

  1.535 W

  খ

  0 W

  গ

  2.484 W

  ঘ

  1.598 W
• The power factor of a squirrel cage induction motor generally is ___________
  ক

  .6-.8

  খ

  .1-.2

  গ

  .2-.4

  ঘ

  .5-.7
• If induction motor rotor power is 157.5 KW and gross developed power is 79.9 KW, then rotor ohmic loss will be _________ KW.
  ক

  77.5

  খ

  77.6

  গ

  76.9

  ঘ

  77.1
• The slope of the V-I curve is 1.1°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.
  ক

  .019 Ω

  খ

  .036 Ω

  গ

  .075 Ω

  ঘ

  .084 Ω
• Calculate the line voltage in star connection when phase voltage=45 V.
  ক

  77.9 V

  খ

  77.6 V

  গ

  77.2 V

  ঘ

  77.8 V
• If induction motor air gap power is 67 KW and mechanically developed power is 26 KW, then rotor ohmic loss will be _________ KW.
  ক

  41

  খ

  42

  গ

  43

  ঘ

  44
• The no-load circuit test on a 3-Φ induction motor is conducted at a rotor speed of _______
  ক

  Zero

  খ

  < Ns

  গ

  > Ns

  ঘ

  Ns
• R.M.S value of the sinusoidal waveform q(t)=2.11cos(87.25t+78π÷478.23).
  ক

  1.49 V

  খ

  1.56 V

  গ

  1.12 V

  ঘ

  1.78 V
• Calculate the amplitude of the sinusoidal waveform z(t)=.27sin(.369πt+.142π÷4.25).
  ক

  .287

  খ

  .270

  গ

  .216

  ঘ

  .287
• A 20-pole, 3-phase, 90 Hz induction motor is operating at a speed of _______ rpm. The frequency of the rotor current of the motor in Hz is 20.
  ক

  418.56

  খ

  420.12

  গ

  421.23

  ঘ

  422.45
• A 32-pole, 3-phase, 70 Hz induction motor is operating at a speed of 112 rpm. The frequency of the rotor current of the motor in Hz is __________
  ক

  40.2

  খ

  46.1

  গ

  40.1

  ঘ

  40.6