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zCorrelation > Mining Methods, Mine Ventilation, Mine Safety > Flashcards

Mining Methods, Mine Ventilation, Mine Safety Flashcards

1
Q
  1. In a mine with 2,000 employees where 100 were on sick leave and another 100 were on vacation leave for a particular month, there were 18 lost time accidents. Assuming the employees worked for 25 days (for 8 hours) and no one worked overtime, what was the accident frequency rate per million manhours?
    a. 50
    b. 45
    c. 100
    d. 75
    e. None of these
A

A

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2
Q
  1. The costliest method in underground mining
    a. Square set stoping
    b. Cut and fill stoping
    c. Room and pillar
    d. Shrinkage stoping
A

A

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3
Q
  1. Used to measure moderate-velocity airflow
    a. Pitot tube
    b. Smoke-cloud generator
    c. Vane anemometer
    d. Any of these
A

C

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4
Q
  1. Any source of potential damage, hard, or adverse health effects on something or someone
    a. Risk
    b. Hazard
    c. Safety
    d. Accident
    e. Risk assessment
A

B

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5
Q
  1. Sublevel block caving is a hybrid between sublevel caving and block caving introduced to counter
    a. Drilling and blasting problems in sublevel caving
    b. Draw control problems in block caving
    c. Problems in sublevel caving due to dilution and mining at depth
    d. Problems in block caving regarding stability, reinforcement, and secondary blasting problems
A

D

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6
Q
  1. The losses in energy due to the roughness of the wall
    a. Rubbing surface
    b. Static pressure losses
    c. Frictional pressure losses
    d. None of these
A

C

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7
Q
  1. In class B mine, the safety engineer required should be
    a. One full time
    b. One part time
    c. At least one
    d. One full time and one part time
A

A

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8
Q

The threshold limits value of carbon dioxide as per “Revised Mine Safety Rules and Regulations”
a. 1.00% by volume
b. 0.75% by volume
c. 0.50% by volume
d. 0.25% by volume

A

C

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8
Q
  1. A system of transporting ore consisting essentially of head frame, head sheaves, winding machine and winding ropes:
    a. Conveyor transport
    b. Trackless transport
    c. Rail transport
    d. Hoisting
A

D

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9
Q
  1. Pressure exerted by the air on the walls of the containing vessel
    a. Total pressure
    b. Static pressure
    c. Dynamic pressure
    d. Frictional pressure
A

B

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10
Q
  1. The unsupported underground mining methods can be used in any type except:
    a. Hydrothermal deposits
    b. Vein type deposits
    c. Placer deposits
    d. Bedded deposits
A

C

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11
Q
  1. Tailings and slurries may be used as backfill in a subsidence area
    a. True
    b. False
    c. Permissible
    d. Depending on the specific gravity
A

B

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12
Q
  1. A product of mine explosion and is given off by gasoline motors and during detonation of negating oxygen-balanced explosives
    a. Carbon dioxide
    b. Nitrogen dioxide
    c. Carbon monoxide
    d. Methane
A

C

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13
Q
  1. The percentage of time the equipment is available to perform its intended function over a defined period of time when it is required by operation
    a. Production time
    b. Physical availability
    c. Mechanical availability
    d. Percent utilization
    e. Both C and D
A

C

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14
Q
  1. Investigation reports discussing the severity of an accident in case of fatal or serious accident shall be made
    a. Within 7 calendar days from the date of the accident
    b. Within 15 calendar days from the date of the accident
    c. Within 21 calendar days from the date of the accident
    d. Within 30 calendar days from the date of the accident
    e. Should be made within 24 hours from the onset of the accident
A

B

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15
Q
  1. Mine gas that supports combustion
    a. Carbon dioxide
    b. Carbon monoxide
    c. Hydrogen sulfide
    d. Oxygen
    e. Nitrous oxide
A

D

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16
Q
  1. An excavator loads dump trucks in a mining operation. The excavator has a cycle time of 2 minutes. Each dump truck has a capacity of 80 tons and requires 8 buckets to fill. Determine the number of dump trucks that can be loaded per hour, assuming an 80% utilization rate
    a. 5 units
    b. 4 units
    c. 7 units
    d. 3 units
    e. None of these
A

D

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17
Q
  1. The ideal number of members of a miner rescue team should be
    a. 5
    b. 7
    c. 9
    d. 10
    e. At least 3
A

A

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18
Q
  1. Validity of all safety engineer/safety inspector permits
    a. 1 year
    b. 2 years
    c. 3 years
    d. 4 years
    e. 5 years
A

C

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19
Q
  1. In the context of mine production optimization, which of the following factors can contribute to increased operational efficiency and productivity
    a. Adequate maintenance and minimized equipment breakdowns
    b. Inefficient resource allocation and scheduling
    c. Lack of data collection and analysis
    d. Underutilized equipment and low equipment availability
    e. None of the above
A

A

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20
Q
  1. At what temperature are Celsius and Fahrenheit equal
    a. 5 deg. F and 5 deg. C
    b. -40 deg F and -40 deg C
    c. -5 deg F and -5 deg C
    d. 40 deg F and 40 deg C
    e. None of these
A

B

21
Q
  1. Underground temperature measured with a thermometer whose bulb is covered with a thin, wet cotton sleeve
    a. Standard temperature
    b. Dry-bulb temperate
    c. Wet-bulb temperature
    d. Either A and B
    e. Either A and C
A

C

22
Q
  1. The faster the air moves, the lower its pressure
    a. Kirchoff’s law
    b. Ohm’s law
    c. Ventilation
    d. Bernoulli’s principle
    e. Dynamic pressure
A

D

23
Q
  1. A large scale or bulk mining method that is highly productive, low in cost, and used primarily on massive deposits that must be mined underground
    a. Cut and fill
    b. Longwall
    c. Block caving
    d. Top slicing
    e. Stope and pillar
A

C

24
Q
  1. Sublevel caving method remains to be called so due to the fact that
    a. The characteristic of the ore and country rocks have capability index
    b. The ore and country rock caves
    c. The ore caves
    d. The country rock (hanging and foot wall) caves
A

D

25
Q
  1. The temporary safety inspector shall renew its temporary license every
    a. Two years
    b. Three years
    c. Quarterly
    d. Every year
A

D

26
Q
  1. During the first shift of a 24-hour operation with a 2 shifting schedule, a drill machine was in operation for 10.5 hours and underwent repairs for 0.5 hours. Within this time frame, the drill machine achieved a production of 251 meters. Calculates the penetration rate of the drill machine.
    a. 23 m/hr
    b. 24 m/hr
    c. 25 m/hr
    d. 26 m/hr
    e. None of these
A

B

26
Q
  1. Sublevel caving layout depends primarily on the size and shape of the ore body, for steeply dipping and narrow ore bodies, the appropriate layout is
    a. Longitudinal layout
    b. Perpendicular layout
    c. Cross-section layout
    d. Transverse layout
A

A

27
Q
  1. It is any division or branch of the ventilation circuit
    a. Air split
    b. Air way
    c. Air course
    d. Split
    e. Air flow
A

A

28
Q
  1. Lung ailment caused by prolonged exposure to tin dust
    a. Anthracosis
    b. Pneumoconiosis
    c. Silicosis
    d. Asbestosis
    e. Stannosis
A

E

29
Q
  1. The class A mine underground has at least of number _____ workers
    a. 150
    b. 125
    c. 250
    d. 200
    e. 100
A

A

30
Q
  1. Equipment that is preferred in pioneering mine works
    a. Dozers
    b. Scrappers
    c. Motor graders
    d. Compactors
    e. None of these
A

A

31
Q
  1. The deputized safety inspector should have
    a. Five years experience in safety work
    b. At least ten years in service in the company
    c. Three years in underground safety
    d. One year in safety work
A

B

32
Q
  1. The sublevel shrinkage method is a variant of sublevel caving and shrinkage stoping to developed to reduce
    a. Drawbacks due to mechanization of operation
    b. Drawbacks due to mining at depth
    c. Drawbacks in sublevel caving such as stability problem as mining goes deeper and minimizing dilution
    d. Drawbacks in shrinkage stoping such as dilution
A

C

33
Q
  1. The practice of removing the gas contained in a coal seam and adjoining strata through wellbores, drillholes, and pipelines
    a. Borehole mining
    b. Coal degasification
    c. Coalification
    d. Coal drainage
    e. None of these
A

B

34
Q
  1. ______ shall mean those that will prevent the injured from reporting to work on the working day following the day of injury and thereafter
    a. Non-lost time
    b. Lost time
    c. Severity rate
    d. Accident frequency rate
A

B

35
Q
  1. The days lost per million manhours worked
    a. Severity rate
    b. Frequency rate
    c. Lost-time accidents
    d. Accident
    e. Incidence rate
A

A

36
Q
  1. The most common cause of fatal accident in underground miners
    a. Rockfall
    b. Mechanical fault
    c. Cave-in
    d. Mine fire
A

A

37
Q
  1. Underground method used in metallic ores where pillar is left after mining the ore
    a. Room and pillar
    b. Stope and pillar
    c. Stull stoping
    d. Shrinkage stoping
    e. Longwall
A

B

38
Q
  1. The time during which equipment is not available for productive work due to maintenance, repairs, breakdown, changeovers, or other factors
    a. Idle time
    b. Cycle time
    c. Down time
    d. Break time
    e. None of these
A

C

39
Q
  1. The wall rock strength of cut and fill stoping must be
    a. Weak to fairly weak
    b. Fairly strong to strong
    c. Moderate to fairly strong
    d. Strong
A

A

40
Q
  1. It is an unsupported stope but uses a lot of timber
    a. Top slicing
    b. Square set
    c. Stull stoping
    d. Longwall mining
A

C

41
Q
  1. Which of the following is a continuous mining method
    a. Longwall miner
    b. Bucket-wheel excavator
    c. Dredge
    d. Augering
    e. All of these
A

D

42
Q
  1. During the first shift of a 24-hour operation with a 2 shifting schedule, a drill machine was in operation for 10.5 hours and underwent repairs for 0.5 hours. Within this time frame, the drill machine achieved a production of
    a. 23 m/hr
    b. 24 m/hr
    c. 25 m/hr
    d. 26 m/hr
    e. None of these
A

B

42
Q
  1. An excavator loads dump trucks in a mining operation. The excavator has a cycle time of 2 minutes. Each dump truck has a capacity of 80 tons and requires 8 buckets to fill. Determine the number of dump trucks that can be loaded per hour, assuming an 80% utilization rate
    a. 5 units
    b. 4 units
    c. 7 units
    d. 3 units
    e. None of these
A

D

43
Q
  1. This gas supports all life forms and a decrease of its availability in air composition can be lethal
    a. Nitrogen
    b. Oxygen
    c. Hydrogen
    d. Both A and B
    e. None of these
A

B

44
Q
  1. The threshold limit value of hydrogen sulfide as per “Revised Mines Safety Rules and Regulations:
    a. 0.01% by volume
    b. 0.20% by volume
    c. 0.10% by volume
    d. 0.30% by volume
A

C

45
Q
  1. Validity of all safety engineers/safety inspector permits
    a. 1 year
    b. 2 years
    c. 3 years
    d. 4 years
    e. 5 years
A

C

46
Q
  1. The vertical height of working benches shall be kept at a maximum of ___ meters above the maximum reach of the shovel/loader being used
    a. 2
    b. 1.5
    c. 3.5
    d. 5
A

B

47
Q
  1. Sublevel caving method remains to be called so due to the fact that
    a. The characteristic of the ore and country rocks have capability index
    b. The ore and country rock caves
    c. The ore caves
    d. The country rock (hanging and foot wall) caves
A

zCorrelation (7 decks)

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