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MCQs

Total Questions : 473 | Page 3 of 48 pages
Question 21. The torque developed in the cage induction motor with auto-starter is
  1.    k/torque with direct switching
  2.    K × torque with direct switching
  3.    K2 × torque with direct switching
  4.    k2/torque with direct switching
 Discuss Question
Answer: Option C. -> K2 × torque with direct switching
Question 22. The efficiency of an induction motor can be expected to be nearly
  1.    60 to 90 %
  2.    80 to 90 %
  3.    95 to 98 %
  4.    99 %
 Discuss Question
Answer: Option B. -> 80 to 90 %
Question 23. Which is of the following data is required to draw the circle diagram for an induction motor?
  1.    Block rotor test only
  2.    No load test only
  3.    Block rotor test and no-load test
  4.    Block rotor test, no-load test and stator resistance test
 Discuss Question
Answer: Option D. -> Block rotor test, no-load test and stator resistance test
Question 24. Slip rings are usually made of
  1.    Copper
  2.    Carbon
  3.    Phosphor bronze
  4.    Aluminium
 Discuss Question
Answer: Option C. -> Phosphor bronze
Question 25. The starting torque of a three phase induction motor can be increased by
  1.    Increasing slip
  2.    Increasing current
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 26. Rotor rheostat control method of speed control is used for
  1.    Squirrel-cage induction motors only
  2.    Slip ring induction motors only
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option B. -> Slip ring induction motors only
Question 27. The stating torque of the slip ring induction motor can be increased by adding
  1.    External inductance to the rotor
  2.    External resistance to the rotor
  3.    External capacitance to the rotor
  4.    Both resistance and inductance to rotor
 Discuss Question
Answer: Option B. -> External resistance to the rotor
Question 28. A double squirrel-cage induction motor has
  1.    Two rotors moving in opposite direction
  2.    Two parallel windings in stator
  3.    Two parallel windings in rotor
  4.    Two series windings in stator
 Discuss Question
Answer: Option C. -> Two parallel windings in rotor
Question 29. The term 'cogging' is associated with
  1.    Three-phase transformers
  2.    Compound generators
  3.    D.C. series motors
  4.    Induction motors
 Discuss Question
Answer: Option D. -> Induction motors
Question 30. In medium sized induction motors, the slip is generally around
  1.    0.04 %
  2.    0.4 %
  3.    4 %
  4.    14 %
 Discuss Question
Answer: Option C. -> 4 %

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