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MCQs

Total Questions : 86 | Page 9 of 9 pages
Question 81. A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the lowest speed is used for
  1.    lifting
  2.    hoisting
  3.    lowering
  4.    landing the load
 Discuss Question
Answer: Option D. -> landing the load


landing the load


Question 82. The number of sets used in pole changing type squirrel cage motors for derricks and winches, is
  1.    2
  2.    3
  3.    4
  4.    6
 Discuss Question
Answer: Option B. -> 3


3


Question 83. A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the medium speed is used for
  1.    lifting
  2.    hoisting
  3.    lowering
  4.    landing the load
 Discuss Question
Answer: Option A. -> lifting


lifting


Question 84. 1/2 hour rated motors are used for
  1.    light duty cranes
  2.    medium duty cranes
  3.    heavy duty cranes
  4.    none of the above
 Discuss Question
Answer: Option B. -> medium duty cranes


medium duty cranes


Question 85. Which of the following drive can be used for derricks and winches ?
  1.    DC motors with Ward Leonard control
  2.    AC slip-ring motors with variable resistance
  3.    Pole changing squirrel cage motors
  4.    Any of the above
 Discuss Question
Answer: Option D. -> Any of the above


Any of the above


Question 86. Heavy duty cranes are used in
  1.    Heavy engineering workshops
  2.    Steel plants
  3.    Ore handling plants
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above


All of the above


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