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MCQs

Total Questions : 473 | Page 6 of 48 pages
Question 51. The starting torque of a 3 phase squirrel cage induction motor is
  1.    Twice the full load torque
  2.    1.5 times the full load torque
  3.    Equal to full load torque
  4.    Any of the above
 Discuss Question
Answer: Option B. -> 1.5 times the full load torque
Question 52. When the equivalent circuit diagram of double squirrel-cage induction motor is constructed the two cages can be considered
  1.    In series
  2.    In parallel
  3.    In series-parallel
  4.    In parallel with stator
 Discuss Question
Answer: Option B. -> In parallel
Question 53. Insertion of resistance in the stator of an induction motor
  1.    Increases the load torque
  2.    Decreases the starting torque
  3.    Increases the starting torque
  4.    None of the above
 Discuss Question
Answer: Option B. -> Decreases the starting torque
Question 54. In a star-delta starter of an induction motor
  1.    Resistance is inserted in the stator
  2.    Reduced voltage is applied to the stator
  3.    Resistance is inserted in the rotor
  4.    Applied voltage per stator phase is 57.7% of the line voltage
 Discuss Question
Answer: Option D. -> Applied voltage per stator phase is 57.7% of the line voltage
Question 55. The shape of the torque/slip curve of induction motor is
  1.    Parabola
  2.    Hyperbola
  3.    Rectangular parabola
  4.    Straight line
 Discuss Question
Answer: Option C. -> Rectangular parabola
Question 56. The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type
  1.    Star connected only
  2.    Delta connected only
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 57. In squirrel cage induction motors, the rotor slots are usually given slight skew in order to
  1.    Reduce windage losses
  2.    Reduce eddy currents
  3.    Reduce accumulation of dirt and dust
  4.    Reduce magnetic hum
 Discuss Question
Answer: Option D. -> Reduce magnetic hum
Question 58. In a three-phase induction motor
  1.    Power factor at starting is high as compared to that while running
  2.    Power factor at starting is low as compared to that while running
  3.    Power factor at starting in the same as that while running
  4.    None of these
 Discuss Question
Answer: Option B. -> Power factor at starting is low as compared to that while running
Question 59. In the circle diagram for induction motor, the diameter of the circle represents
  1.    Slip
  2.    Rotor current
  3.    Running torque
  4.    Line voltage
 Discuss Question
Answer: Option B. -> Rotor current
Question 60. In a squirrel cage motor the induced e.m.f. is
  1.    Dependent on the shaft loading
  2.    Dependent on the number of slots
  3.    Slip times the stand still e.m.f. induced in the rotor
  4.    None of the above
 Discuss Question
Answer: Option C. -> Slip times the stand still e.m.f. induced in the rotor

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