61. Heat control switches are used in A. Transformers B. Cooling ranges C. Three phase induction motors D. Single phase 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
62. In _________ method of staging three phase induction motors the starting voltage is not reduced. A. Autotransformer B. Star-delta C. Slip ring D. Any 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
63. Battery operated scooter for braking uses A. Plugging B. Mechanical braking C. Regenerative braking D. Rheostatic braking 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
64. In squirrel cage induction motors which of the following methods of starting cannot be used? A. Resistance in rotor circuit B. Resistance in stator circuit C. Autotransformer starting D. Star-delta starting 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
65. The cost of an induction motor will increase as A. Horsepower rating increases but r.p.m. decreases B. Horsepower rating decreases but r.p.m. increases C. Horsepower rating and operating speed increases D. Horsepower rating and operating speed 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
66. Which of the following alternatives will be cheaper? A. A 100 H.P. AC. three phase motor B. Four motors of 25 H.P. each C. Five motors of 20 H.P. each D. Ten motors of 10 H.P. each 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
67. Which of the following motors always starts on load? A. Conveyor motor B. Floor mill motor C. Fan motor 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
68. For a particular application the type of electric and control gear are determined by which of the following considerations? A. Starting torque B. Conditions of environment C. Limitation on starting current 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
69. The size of an excavator is usually expressed in terms of A. "Crowd" motion B. Angle of swing C. Cubic meters D. Travel in meters 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
70. The capacity of a crane is expressed in terms of A. Type of drive B. Span C. Tonnes D. Any 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
