JNTU
JNTU B.Tech III Year MINE MECHANIZATION - II Previous Question Paper (May/June - 2019 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
Why the safety catches are to be inspected regularly?
Answer
Safety catches are critical life-saving devices designed to arrest the cage in the event of a winding rope failure. Regular inspection is mandatory to ensure they are free from corrosion, properly lubricated, and that the activating mechanism is sensitive enough to engage instantly during an emergency.
What is the importance and need of keps?
Answer
Keps are mechanical supports used to hold the cage steady at the landing level during loading and unloading operations. Their importance lies in preventing the cage from oscillating or moving vertically due to rope stretch or changes in load, which ensures safe passage for mine cars and personnel.
What are the disadvantages of koepe winding system?
Answer
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What are the different types of electrical braking for winders?
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What are the conditions suitable for use of SDLS in mines?
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What are the safety features of LHD?
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What are the different types of Power Loaders used in u/g Mines?
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What are the characteristics of Centrifugal Pumps?
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What are the disadvantages of surface continuous miner?
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How do you calculate the capacity of a Bucket Wheel Excavator?
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Part B
Explain the procedure of capping of a winding rope.
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Describe the fleet angle with a simple sketch.
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Discuss about Skip winding Vs Cage winding.
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List and explain the different safety devices on Winders.
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What are the different methods of balancing the torque on the winding drum?
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Calculate the power of the motor, if the r.m.s torque for a winder is 115 kNm, the cylindrical winding drum diameter is 4.6 m and the maximum rope speed is 8 m/sec.
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Describe the constructional features of a Shearer.
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Explain the operation and maintenance of Shearers used in mines.
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What are the limitations of use of SDLs in underground mines?
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Explain the construction and operation of SDLs in mines.
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Calculate the rate of production per shift (8 hours) of a shuttle car having 10 tonnes capacity and the cycle time is 12 minutes. Available time for the operation of shuttle car is 5 hours and the utilization time is 80%.
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What do you mean by axial thrust in a pump?
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Explain the balancing the axial thrust.
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Explain the basic construction, applications and operation of dragline.
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Explain the construction and operation of Bucket Wheel Excavator.
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What are the advantages of Bucket Wheel Excavator?
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