Speed Control of Shunt or Separately Excited Motors MCQ

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• Calculate mark to space ratio if the system is on for 26.3 sec and off for 24.2 sec.
  ক

  1.086

  খ

  1.042

  গ

  1.214

  ঘ

  1.876
• Calculate the total heat dissipated in a resistor of 50 Ω when 1.4 A current flows through it.
  ক

  98 W

  খ

  92 W

  গ

  91 W

  ঘ

  93 W
• Calculate the active power in a .154 H inductor.
  ক

  22 W

  খ

  14 W

  গ

  45 W

  ঘ

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

  Low at light load only

  খ

  Low at heavy loads only

  গ

  Low at the light and heavy loads both

  ঘ

  Low at rate load only
• If induction motor air gap power is 48 KW and gross developed power is 28 KW, then rotor ohmic loss will be _________ KW.
  ক

  10

  খ

  20

  গ

  30

  ঘ

  40
• The slope of the V-I curve is 39.1°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.
  ক

  .81 Ω

  খ

  .36 Ω

  গ

  .75 Ω

  ঘ

  .84 Ω
• A 3-phase induction machine draws active power P and reactive power Q from the grid. If it is operated as a generator, then P and Q will be _________
  ক

  Positive and Negative

  খ

  Negative and Positive

  গ

  Positive and Positive

  ঘ

  Negative and Negative
• If induction motor air gap power is 10 KW and mechanically developed power is 8 KW, then rotor ohmic loss will be _________ KW.
  ক

  1

  খ

  2

  গ

  3

  ঘ

  4
• The short 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 V=48sin(6.5πt+89π÷46.8).
  ক

  33.94 V

  খ

  33.56 V

  গ

  33.12 V

  ঘ

  33.78 V
• Calculate the amplitude of the sinusoidal waveform z(t)=715sin(165πt+2π÷468).
  ক

  710

  খ

  715

  গ

  716

  ঘ

  718
• A 16-pole, 3-phase, 60 Hz induction motor is operating at a speed of 150 rpm. The frequency of the rotor current of the motor in Hz is __________
  ক

  20

  খ

  40

  গ

  30

  ঘ

  10
• The advantage of the double squirrel cage induction motor over a single cage rotor is that its _______
  ক

  Efficiency is higher

  খ

  Power factor is higher

  গ

  Slip is larger

  ঘ

  Starting current is lower