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MCQs

Total Questions : 86 | Page 2 of 9 pages
Question 11. ________ need frequent starting and stopping of electric motors,
  1.    Paper mills
  2.    Grinding mills
  3.    Air-conditioners
  4.    Lifts and hoists
 Discuss Question
Answer: Option D. -> Lifts and hoists
Question 12. The load cycle for a motor driving a power press will be
  1.    Variable load
  2.    Continuous
  3.    Continuous but periodical
  4.    Intermittent and variable load
 Discuss Question
Answer: Option D. -> Intermittent and variable load
Question 13. Which of the following motors is used for elevators?
  1.    Induction motor
  2.    Synchronous motor
  3.    Capacitor start single phase motor
  4.    Any of the above
 Discuss Question
Answer: Option A. -> Induction motor
Question 14. Ward-Leonard controlled D.C. drives are generally used for _________ excavators.
  1.    Light duty
  2.    Medium duty
  3.    Heavy duty
  4.    All of the above
 Discuss Question
Answer: Option C. -> Heavy duty
Question 15. A reluctance motor
  1.    Is provided with slip rings
  2.    Requires starting gear
  3.    Has high cost
  4.    Is compact
 Discuss Question
Answer: Option D. -> Is compact
Question 16. Which of the following motors are preferred for overhead traveling cranes?
  1.    Slow speed motors
  2.    Continuous duty motors
  3.    Short time rated motors
  4.    None of the above
 Discuss Question
Answer: Option C. -> Short time rated motors
Question 17. In jaw crushers a motor has to often start against ________ load.
  1.    Heavy
  2.    Medium
  3.    Normal
  4.    Low
 Discuss Question
Answer: Option A. -> Heavy
Question 18. For which of the following applications D.C. motors are still preferred?
  1.    High efficiency operation
  2.    Reversibility
  3.    Variable speed drive
  4.    High starting torque
 Discuss Question
Answer: Option C. -> Variable speed drive
Question 19. Is not a part of ball bearing?
  1.    Inner race
  2.    Outer race
  3.    Cage
  4.    Bush
 Discuss Question
Answer: Option D. -> Bush
Question 20. The characteristics of drive for crane hoisting and lowering are which of the following?
  1.    Precise control
  2.    Smooth movement
  3.    Fast speed control
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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