Controlling Speed Using Rotor Resistance MCQ

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• Armature reaction is magnetizing in nature due to a purely resistive load in the synchronous motor.
  ক

  True

  খ

  False
• The phase difference between voltage and current in the choke coil.
  ক

  90°

  খ

  40°

  গ

  50°

  ঘ

  68°
• Calculate the value of the duty cycle if the system is on for 1 sec and off for 0 sec.
  ক

  1

  খ

  .4

  গ

  .1

  ঘ

  .6
• The slope of the V-I curve is 180o. Calculate the value of resistance. The graph is parallel to the x-axis.
  ক

  1.47 Ω

  খ

  1.81 Ω

  গ

  0 Ω

  ঘ

  4.12 Ω
• Calculate the reactive power in a 7.2545 Ω resistor.
  ক

  1.221 VAR

  খ

  2.611 VAR

  গ

  0 VAR

  ঘ

  1.997 VAR
• Calculate the reactive power in a 2.2 Ω resistor.
  ক

  1.2 VAR

  খ

  2.6 VAR

  গ

  0 VAR

  ঘ

  1.9 VAR
• Calculate the power factor if the power angle is 36.86°.
  ক

  .8

  খ

  .4

  গ

  .6

  ঘ

  1
• The unit of oscillating power is VAR.
  ক

  True

  খ

  False
• Cylindrical pole machines are more stable than salient rotor machines.
  ক

  True

  খ

  False
• What is the formula for the maximum active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, δ represents rotor angle, X represents reactance)
  ক

  Eb×Vt×sinδ÷X

  খ

  Eb×Vt2÷X

  গ

  Eb2×Vt×sinδ÷X

  ঘ

  Eb×Vt÷X