Rotor Frequency MCQ

Test your knowledge with important Rotor Frequency MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Rotor Frequency MCQs on Bissoy. Bissoy App

• The squirrel cage induction motor of 6-pole can be used as ________ induction motor.
  ক

  any number of poles

  খ

  6 pole

  গ

  6 or 12 pole

  ঘ

  integral number of 4 poles
• The rotor winding for 3-phase slip ring induction motor having delta connected stator must be connected in _________
  ক

  star

  খ

  delta

  গ

  tertiary

  ঘ

  any of the mentioned
• In a three phase slip ring induction motor, brushes are connected to _________
  ক

  external star connected resistors

  খ

  dc supply

  গ

  3-phase ac supply

  ঘ

  any of the mentioned
• The rotor of th 3-phase induction motor rotates in the same direction as that of stator field. This can be explained by _________
  ক

  Newton’s laws of motion

  খ

  Farady’s laws of electromagnetic induction

  গ

  Lenz’s law

  ঘ

  Fleming’s right hand rule
• The 3-phase induction motor with rotor circuit open will _________
  ক

  not run

  খ

  run normally

  গ

  get over heated

  ঘ

  make noise
• Stator flux induces emf in the rotor conductors _________
  ক

  magnitude depending on the load

  খ

  rotating at synchronous speed around stator

  গ

  constant in magnitude

  ঘ

  none of the mentioned
• For a 4-pole, 3-phase induction motor the rotor speed found is 2100 rpm at 50 Hz. Then the phase sequence of the emf generated will be?
  ক

  acb

  খ

  abc

  গ

  no emf will be induced

  ঘ

  cba
• A 4-pole, 3-phase slip ring induction motor is used as a frequency changer. Its stator is excited from 3-phase, 50 Hz supply. A load requiring 3-phase, 20 Hz supply is connected to the star-connected rotor through three slip-rings of SRIM. At what two speeds the prime mover should drive the rotor of this SRIM?
  ক

  900 rpm

  খ

  600 rpm

  গ

  1500 rpm

  ঘ

  0
• A properly shunted center zero galvanometer is connected in the rotor circuit of a 6-pole, 50 hz wound rotor induction motor. If the makes 90 complete oscillations in one minute, the rotor speed is?
  ক

  1000 rpm

  খ

  970 rpm

  গ

  950 rpm

  ঘ

  930 rpm
• A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. Speed of the rotor field w.r.t. stator field is?
  ক

  zero

  খ

  150 rad/s

  গ

  6.28 rad/s

  ঘ

  145 rad/s
• A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. Speed of the rotor field w.r.t. rotor structure is?
  ক

  157 rad/s

  খ

  150 rad/s

  গ

  6.28 rad/s

  ঘ

  145 rad/s
• A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. Speed of the stator field revolving rotor structure is?
  ক

  157 rad/s

  খ

  150 rad/s

  গ

  6.28 rad/s

  ঘ

  145 rad/s
• A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. Speed of the stator filed with respect to stator structure is?
  ক

  157 rad/s

  খ

  150 rad/s

  গ

  6.28 rad/s

  ঘ

  145 rad/s
• A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. Rotor frequency is?
  ক

  2 Hz

  খ

  50 Hz

  গ

  52 Hz

  ঘ

  58 Hz
• A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. The full load slip will be?
  ক

  4%

  খ

  5%

  গ

  2.4%

  ঘ

  3%
• A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. The number of poles of this motor is?
  ক

  4

  খ

  6

  গ

  5

  ঘ

  2
• For a 4 pole three phase induction motor having synchronous speed of 1500 rpm is operating at 1450rpm. The frequency of the induced emf in rotor is?
  ক

  100 Hz

  খ

  50 Hz

  গ

  150 Hz

  ঘ

  0 Hz
• Slip is defined as _________ (Ns as the synchronous speed and Nr is the rotor speed)
  ক

  Ns-Nr/Ns

  খ

  Ns-Nr/Nr