Opencast Mining MCQ

Test your knowledge with important Opencast Mining MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Opencast Mining MCQs at Bissoy

• C.S.R means
  ক

  Company survey reportability

  খ

  Corporate social responsibility

  গ

  Central security reason

  ঘ

  None
• Ripper is essentially of . . . . . . . . mounted.
  ক

  Tyre

  খ

  Crawler

  গ

  Wheel

  ঘ

  All
• Machines using crawler chains are not allowed to cross public-roads of they posses.
  ক

  Cleats of grouser plates

  খ

  Smooth gruser plates

  গ

  Plain plates without rubber

  ঘ

  None
• The diameter and depth of blast holes are generally kept constant depending on . . . . . . . . of equipment.
  ক

  Base

  খ

  Size

  গ

  Length

  ঘ

  Highwall
• Which motor improves power factor
  ক

  Induction moter

  খ

  Slip ring moter

  গ

  Synchronous moter (over excited)

  ঘ

  None
• The following requirements of electric power supply system in surface mines are
  ক

  Adequate capacity

  খ

  Safe

  গ

  Required voltage and frequency

  ঘ

  Economical

  ঙ

  All these
• The output of the shovel with 2 cubic meter bucket is cu.m per year.
  ক

  1.5 lac

  খ

  2.5 lac

  গ

  3.5 lac

  ঘ

  4.5 lac
• Permanent and semi permanent machines always powered by . . . . . . . .
  ক

  Diesel

  খ

  Kerosine

  গ

  Compressor

  ঘ

  Electric
• In ultimate pit analysis the most widely used method is
  ক

  Dynamic programming

  খ

  Linear programming

  গ

  Simulation

  ঘ

  Heuristic technique
• The angle which a plane joining the crest of the quarry which the toe of the bottom most bench makes from the borizontal.
  ক

  Crest

  খ

  Pit bottom

  গ

  Ultimate slope angle

  ঘ

  Cut
• The best principle for predicting of dump failure at the begining stage.
  ক

  Initiation of cracks on sides

  খ

  Rate of displacement point under consideration

  গ

  Development of depression on top

  ঘ

  Changes in geometric shape and size of dump
• The conditions suitable for internal dump are
  ক

  Horizontal deposits

  খ

  Thick and moderately dipping deposits

  গ

  Steeply dipping deposits

  ঘ

  None
• Cut off grade is
  ক

  The grade of ore ultimately fed to the benefication plant

  খ

  Always the same average grade

  গ

  The grade of ore through net the ore body

  ঘ

  The grade of ore below which mining is uneconomical
• Air consumption by down the hole hammer drills at . . . . . . . .
  ক

  7 kgf/cm² is 5.5m³/min

  খ

  9 kgf/cm² is 6.5m³/min

  গ

  10 kgf/cm² is 8.5m³/min

  ঘ

  6 kgf/cm² is 4m³/min
• The effective position of box cut for a deposit whose OB ratio: ore is least should be
  ক

  At boundary of mineral

  খ

  At the middle of boundary

  গ

  At high seam slope

  ঘ

  At any place
• Scrapers are unsuitable in soils with . . . . . . . .
  ক

  Stumps

  খ

  Large boulders

  গ

  Hard rocks

  ঘ

  All
• The type of drill bit employed in wagon drill machine.
  ক

  Auger bit

  খ

  Eccentri bit

  গ

  X' bit with tungsten carbide

  ঘ

  Worm bit
• R.M.R stands for
  ক

  Rate of Marginal Return

  খ

  Rockmass rating

  গ

  Rating of Massive Roof

  ঘ

  Rated mass of Rock
• These things are employed, heavy earth moving machinery well hole drills etc for extraction of mineral.
  ক

  Manual mining

  খ

  Mechanised open cast

  গ

  Horizon

  ঘ

  Slicing
• The limiting gredient of ordinary vehicle is . . . . . . . . from the horizontal.
  ক

  1 in 6

  খ

  1 in 5

  গ

  1 in 10

  ঘ

  1 in 15
• Hydraulic shovels which eliminate the use of . . . . . . . .
  ক

  Wire ropes

  খ

  Buckets

  গ

  Lights

  ঘ

  Pulleys
• Drilling, blasting is eliminated in the following open-cast method.
  ক

  Dozer

  খ

  Shovel

  গ

  Drag line

  ঘ

  Surface miner
• Total number of injuries in open cast mine employing 800 persons is 16 in a year, as per the DGMS norms, the injury rate per 1000 person employed is . . . . . . . .
  ক

  13

  খ

  15

  গ

  20

  ঘ

  25
• Scraper overall height is . . . . . . . .
  ক

  3.890m

  খ

  3.470m

  গ

  2.320m

  ঘ

  2.5m
• If the pit wall are too steep to allow suitable blends the layout of haul road geometry selected to be
  ক

  Switching back

  খ

  Zig zag

  গ

  Spiral

  ঘ

  All the above
• The degree of fragmentation in primary blasting can be increased by increasing special charge and decreasing the . . . . . . . .
  ক

  Burden

  খ

  Spacing

  গ

  Height

  ঘ

  Density
• Type of drill bit commonly used for Jack hammer.
  ক

  Eccentric

  খ

  Concentric

  গ

  Single chesel carbide tipped bit

  ঘ

  Cross bit
• Jet piercing is suitable only for rocks.
  ক

  Low strength

  খ

  Laminated

  গ

  Good spell ability

  ঘ

  None
• Hole dia meter of Jack hammer drill varies from
  ক

  26 - 28mm

  খ

  28 - 30mm

  গ

  30 - 37mm

  ঘ

  38 - 42mm
• The flow rate of water in hydraulic mining for coal should be atleast a gallen per minute given by
  ক

  50

  খ

  100

  গ

  200

  ঘ

  300