Synchronizing Power and Synchronizing Torque MCQ

Test your knowledge with important Synchronizing Power and Synchronizing Torque MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Synchronizing Power and Synchronizing Torque MCQs at Bissoy

• Which motor can conveniently operate at lagging as well as leading power factor?
  ক

  Synchronous motor

  খ

  Slip ring induction motor

  গ

  Squirrel cage induction motor

  ঘ

  Stepper motor
• Variation in the dc excitation of a synchronous motor causes variation in ___________
  ক

  armature current and power factor

  খ

  power factor

  গ

  armature current

  ঘ

  speed
• In a synchronous motor the back emf peak set up in the stator depends on ___________
  ক

  rotor excitation

  খ

  supply voltage

  গ

  rotor speed

  ঘ

  load on the motor
• The operation of a synchronous motor operating on constant excitation across infinite bus will not be stable if power angle δ?
  ক

  exceeds internal angle θ

  খ

  is less than θ

  গ

  is more than θ/2

  ঘ

  is less than θ/2
• Electromagnetic torque is present in rotating machines when ____________
  ক

  both stator and rotor windings carry current

  খ

  rotor windings carry current

  গ

  stator windings carry current

  ঘ

  any of the mentioned
• For a 4-pole 3 phase, 400V alternator has synchronizing power of 300 units. Then the synchronizing power per mechanical degree is?
  ক

  300

  খ

  1200

  গ

  900

  ঘ

  600
• Which of the following is/are used in synchronous machines to maintain mechanical stability?
  ক

  Damper winding

  খ

  Interpole winding

  গ

  Compensating winding

  ঘ

  Equalizer rings
• Which of the following makes synchronizing power to come to play in the machine?
  ক

  Disturbance in power mover

  খ

  Disturbance in field current

  গ

  Disturbance in load

  ঘ

  All of the mentioned
• Synchronizing power is __________
  ক

  transient in nature

  খ

  steady state in nature

  গ

  pulsating at small frequencies

  ঘ

  constant for a machine
• As load angle is increased, degree of stability __________
  ক

  reduces

  খ

  increases

  গ

  remains same

  ঘ

  no change in stability
• An over excited synchronous machine is more stable than under excited.
  ক

  True

  খ

  False
• Large stiffness coefficient represents ____________
  ক

  motor speed remains practically constant

  খ

  large fluctuations due to mechanical load

  গ

  motor speed is variable to changes

  ঘ

  no such significance with speed
• The coupling angle or load angle of a synchronous motor is defined as the space angle between __________
  ক

  rotor and stator poles of opposite polarity

  খ

  rotor and stator poles of same polarity

  গ

  rotor and stator teeth

  ঘ

  rotor and resultant magnetic field