41. The purpose of using short-circuit gear is A. To short circuit the rotor at slip rings B. To short circuit the starting resistances in the starter C. To short circuit the stator phase of motor to form star D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
42. Insertion of reactance in the rotor circuit A. Reduces starting torque as well as maximum torque B. Increases starting torque as well as maximum torque C. Increases starting torque but maximum torque remains unchanged D. Increases starting torque but maximum torque decreases Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
43. The maximum torque in an induction motor depends on A. Frequency B. Rotor inductive reactance C. Square of supply voltage 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
44. The shaft of an induction motor is made of A. High speed steel B. Stainless steel C. Carbon steel D. Cast iron 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
45. The number of slip rings on a squirrel cage induction motor is usually A. Two B. Three C. Four D. None 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
46. A squirrel cage induction motor is not selected when A. Initial cost is the main consideration B. Maintenance cost is to be kept low C. Higher starting torque is the main consideration D. All above considerations are involved 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
47. Slip ring motor is recommended where A. Speed control is required B. Frequent starting, stopping and reversing is required C. High starting torque is needed D. All above features are required 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
48. If a 3-phase supply is given to the stator and rotor is short circuited rotor will move A. In the opposite direction as the direction of the rotating field B. In the same direction as the direction of the field C. In any direction depending upon phase sequence of supply D. None of these 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
49. Lubricant used for ball bearing is usually A. Graphite B. Grease C. Mineral oil D. Molasses 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
50. For which motor the speed can be controlled from rotor side? A. Squirrel-cage induction motor B. Slip-ring induction motor C. Both (A) and (B) D. None of the above 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
