31. Which of the following motors is preferred for boom hoist of a traveling crane? A. Single phase motor B. Synchronous motor C. A.C. slip ring motor D. Ward-Leonard controlled D.C. shunt motor Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
32. The traveling speed of cranes varies from A. 20 to 30 m/s B. 10 to 15 m/s C. 5 to 10 m/s D. 1 to 2.5 m/s Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
33. Flame proof motors are used in A. Paper mills B. Steel mills C. Moist atmospheres D. Explosive atmospheres Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
34. Which of the following machines has heavy fluctuation of load? A. Printing machine B. Punching machine C. Planer D. Lathe Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
35. In series motor which of the following methods can be used for changing the flux per pole? A. Tapped field control B. Diverter field control C. Series-parallel control D. Any of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
36. Has relatively wider range of speed control. A. Synchronous motor B. Ship ring induction motor C. Squirrel cage induction motor D. D.C. shunt motor Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
37. ________ has least range of speed control. A. Slip ring induction motor B. Synchronous motor C. D.C. shunt motor D. Schrage motor Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
38. In which of the following applications the load on motor changes in cyclic order? A. Electric shovels B. Cranes C. Rolling mills D. All of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
39. For which of the following applications motor has to start with high acceleration? A. Oil expeller B. Floor mill C. Lifts and hoists D. Centrifugal pump Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
40. A pony motor is used for the starting which of the following motors? A. Squirrel cage induction motor B. Schrage motor C. Synchronous motor D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board