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MCQs

Total Questions : 86 | Page 4 of 9 pages
Question 31. Which of the following types of motor enclosure is safest?
  1.    Totally enclosed
  2.    Totally enclosed fan cooled
  3.    Open type
  4.    Semi closed
 Discuss Question
Answer: Option B. -> Totally enclosed fan cooled
Question 32. Which of the following motors is preferred for boom hoist of a traveling crane?
  1.    Single phase motor
  2.    Synchronous motor
  3.    A.C. slip ring motor
  4.    Ward-Leonard controlled D.C. shunt motor
 Discuss Question
Answer: Option C. -> A.C. slip ring motor
Question 33. The traveling speed of cranes varies from
  1.    20 to 30 m/s
  2.    10 to 15 m/s
  3.    5 to 10 m/s
  4.    1 to 2.5 m/s
 Discuss Question
Answer: Option D. -> 1 to 2.5 m/s
Question 34. Flame proof motors are used in
  1.    Paper mills
  2.    Steel mills
  3.    Moist atmospheres
  4.    Explosive atmospheres
 Discuss Question
Answer: Option D. -> Explosive atmospheres
Question 35. Which of the following machines has heavy fluctuation of load?
  1.    Printing machine
  2.    Punching machine
  3.    Planer
  4.    Lathe
 Discuss Question
Answer: Option B. -> Punching machine
Question 36. In series motor which of the following methods can be used for changing the flux per pole?
  1.    Tapped field control
  2.    Diverter field control
  3.    Series-parallel control
  4.    Any of the above
 Discuss Question
Answer: Option D. -> Any of the above
Question 37. Has relatively wider range of speed control.
  1.    Synchronous motor
  2.    Ship ring induction motor
  3.    Squirrel cage induction motor
  4.    D.C. shunt motor
 Discuss Question
Answer: Option D. -> D.C. shunt motor
Question 38. ________ has least range of speed control.
  1.    Slip ring induction motor
  2.    Synchronous motor
  3.    D.C. shunt motor
  4.    Schrage motor
 Discuss Question
Answer: Option B. -> Synchronous motor
Question 39. In which of the following applications the load on motor changes in cyclic order?
  1.    Electric shovels
  2.    Cranes
  3.    Rolling mills
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 40. A pony motor is used for the starting which of the following motors?
  1.    Squirrel cage induction motor
  2.    Schrage motor
  3.    Synchronous motor
  4.    None of the above
 Discuss Question
Answer: Option C. -> Synchronous motor

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