MINISTRY OF SCIENCE AND TECHNOLOGY DEPARTMENT OF TECHNICAL AND by inr11138

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               MINISTRY OF SCIENCE AND TECHNOLOGY
  DEPARTMENT OF TECHNICAL AND VOCATIONAL EDUCATION


              Sample Questions and Answers for (B.Tech Year 1)
                      Min 3024 Mine Operations (2nd Terms)


                                      CHAPTER 5
       CLASSIFICATION OF COMMERCIAL EXPLOSIVES AND THEIR
                               FIELD OF APPLICATIONS


1. Write short notes on the followings:
   (a). Straight Dynamites.
   (b). Slurries or Water Gel explosives.
       Answer : Ch 5.1.(a) & Ch 5.2. (a) Pp 53, 55
2. Write short notes on the followings:
   (a). Dry Blasting Agents.
   (b). Slurry Blasting Agents or Water Gel Blasting Agents.
       Answer : Ch 5.2.b(i) & Ch 5.2. b(ii) Pp 55, 56
3. Write short notes on the followings:
   (a). Explosive Strength.
   (b). Detonation Velocity.
       Answer : Ch 5.3.(a), (b) Pp 58
4. Classify the types of high explosives and write a brief account on:
   (a). Gelatin Dynamites and
   (b). Ammouia Dynamites.
       Answer : Ch 5.1.(a) & Ch 5.2. (a) Pp 53, 55
5. Explain in detail the properties of explosives that must be considered in
       selecting the suitable explosive for specific operation.
       Answer : Ch 5.3. Pp 58, 59
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6. What are the most common types of vibrations caused blasting operations?
  Explain them in detail.
        Answer : Ch 5.4. Pp 61, 62


                                         CHAPTER 1
                          MATERIALS HANDLING IN MINES


7. * Write short notes on the followings:
     (a) The rated or design Capacity ( Pr )
     (b) The loading rate ( Pl)
     (c) The operating Capacity ( Po)
        Answer : Ch 6.5.(a), (b) & (i) Pp 87, 88
8. *Write short notes on any Two of the following topics:
     (a) Back Hoe shovels.
     (b) Wheel loaders
     (c) The bulldozer
        Answer : Ch 6.3.1.(d), Pp 79, 80, 84
9. *Explain briefly the material handling systems in open pit ( cast ) mines.
        Answer : Ch 6.1. Pp 64, 65, 66
10.*Write short notes on any Two of the following topics:
    (a) Direct-loading shovel loaders.
    (b) Shoveling machines with Step-wise loading .
    (c) Side – grab loaders.
        Answer : Ch 6.2.1. (a), (b) Pp 67, 68, 69
11.Explain briefly the advantages and disadvantages of a dragline.
        Answer : Ch 6.3.1. (c), Pp 78
12. Discuss briefly the followings:
    (a) Selection of required bucket size for a loading machine.
    (b) Loading Capacity of loading Machines.
        Answer : Ch 6.5., 6.6. Pp 86, 87,
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13. Explain briefly the comparison of the following two loading machines
    (a) wheel loaders
    (b) Power shovels
        Answer : Ch 6.3.1 (a), 6.3.1.2 (i) Pp 70, 80, 81, 82
14.Explain briefly the comparison on loading shovels versus Draglines.
        Answer : Ch 6.3.1.2 Pp 79
15. Explain briefly comparison on Cable Operated Shovels and Hydraulic front shovels.
        Answer : Ch 6.3.1.1. Pp 74, 75, 76
16. Select the required bucket size and calculate the capacity ( bucket pay load ) of the
    selected bucket size. Also calculate the production capacity “ Po”. In tons/hour for the
    selected loading machines .The following information should be applied.
    Jop Conditions (All Units in metric Systems)
    - Application - Truck loading
    - Production required - 250 metric tons per hour.
    - Material - Blasted limestone (Average)
    - Density of limestone (loose)- 1661 kg/m3.
    - Filling factor = 0.85
    - loading cycle time = 0.40 min ( from Catalog )
        Answer : Ch 6.6. Example (1) Pp 90
17. Select the required bucket size and calculate the bucket payload of the loading machine to
    be selected. The following information apply.
    Job Conditions
    - Application Truck loading
    - Production required 400 metric tons per hour
    - Material Blasted Tin ore
    - Density of Tin ore ( Bank ) 2.44 tons/m3.
    - Filling factor 0.85
    - Swell percent 35%
    - Loader cycle time 0.48 min ( from catalog )
    And then calculate the production capacity “ Po ” for the selected loading machine. Take
A = 0.90 and 0 = 0.85. Give the answer in m3/hr.
        Answer : Ch 6.6. Qs (1) Pp 91
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                                           CHAPTER 2
                                    Mine Transportation


18. Write short notes on any Two of the followings.
     (a) Mechanical Haulage.
     (b) The locomotive Haulage.
     (c) Rail Transport.
       Answer : Ch 7.2.3. , 2.3.1 Pp 93, 94,
19. Write short notes on any Two of the followings.
     (a) Direct Single Drum System.
     (b) Direct Double Drum System.
     (c) Main and tail Haulage.
       Answer : Ch 7.3.2.1. (ii) Pp 94, 95
20.Write short notes on the followings.
     (a) Rolling Resistance ( R.R) for truck
     (b) Grade Resistance (G.R ) for truck
     (c) Rimpull Required (or) Total Resistance for truck.
       Answer : Ch 7.3.5, (2), (3), (4) Pp 123, 124, 125
21. Write short notes on the followings.
     (a) Travel and fixed time.
     (b) Volume / weight factors.
       Answer : Ch 7.3.5, (8), (9) Pp 127
22. Discuss briefly Trackless Transport (or) Rail-free Transport.
       Answer : Ch 7.2.3.2 Pp 97
23. Discuss briefly Pipe Line Transport.
       Answer : Ch 7..2.3.4 Pp 100
24.Discuss briefly the sherry preparation and pump for slurry transport.
       Answer : Pp 103
25. Discuss briefly Dewatering Systems for slurry Transport.
       Answer : Pp 104
26. Explain briefly Determination of Dump truck production.
       Answer : Ch 7.3.5, Pp 123
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27. Write short notes on the followings.
      (a) Available Rimpull .
      (b) Tractive Efficiency.
       Answer : Ch 7.3.5, (5), (6), Pp 125
28. Explain briefly the economic advantages and disadvantages of belt conveyor.
       Answer : Ch 7.3.1, Pp 106
29. Explain briefly performance comparison of Mechanical Drive Dump Truck
   and Electrical Drive Dump Truck.
       Answer : Ch 7.3.4, Pp 121
30. Discuss briefly Job operation efficiency and production.
       Answer : Ch 7.3.5 (10) Pp 123
31. Determine the production captaining of the transport unit for the following information.
   Loading equipment Volvo BM 1614
   Bucket volume 3.6 Lm3 ( 4.7 LCY )
   Cycle time 0.42 min.
   Excavation class 2
   Transport vehicle Volvo BM 861
   Body volume 11.5 LM3 ( 15.0 LCY )
   Traveling time with load 2.28 min.
   Maneuvering for Tipping and tipping time 0.65 min
   Return time 1.18 min.
   Maneuvering for loading 0.40 min
   Planned activities 0.64 min.
   Waiting time in front of the loader 0.50 min.
   Supervisory conversation 0.25 min.
   Other time affecting machine performance 0.75 min.
   Swell factor 1.12
   Bank Density 1930 kg/m3 (or) 3,254lb/yd3.
   Give the answer in (1) load volume/hr. and (2) load mass/hr.
       Answer : Example Calculations Pp 130


                                           End
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                 MINISTRY OF SCIENCE AND TECHNOLOGY
   DEPARTMENT OF TECHNICAL AND VOCATIONAL EDUCATION


               Sample Questions and Answers for (B.Tech Year 1)
                      Min 3074 Mine Plant Design (2nd Terms)




                            Chapter 1 Compressed Air


1. Write Short Notes of Compressed Air.
   Answer : Chapter 1, Pp 1.
2. Write Short Notes of the Following
   (a) Free Air :
   (b) Isothermal Compression or Expansion:
        Answer : (a) and (b) Pp 2
3. Write Short Notes of Following
   (a) Adiabatic Compression or Expansion .
   (b) Volumetric Efficiency
       Answer : Pp 2 and 3
4. Explain Briefly the Diameter of Cylinder for Compressing a Given Amount of Air.
   Answer : Pp 4
5. Describe the Horsepower for Single-Stage Compressor.
   Answer : Pp 5 and 6
6. Describe the Horsepower for Two-Stage Compression .
   Answer : Pp 6
7. Describe the Effect of Altitude of Compressor.
   Answer : Pp 6 and 7
8. Explain Briefly the factor for Altitude Compensation.
   Answer : Pp 7
9. Describe the Air Required by Rock Drills.
   Answer : Pp 8
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10. Write Short notes on the Following
    (a) Air Consumption of Drills at Altitudes.
    (b) Capacity of Compressor to Operates More Than One Drill.
        Answer : Pp 8 and 9
11. Write Short notes on the Following.
    (a) Transmission of Air
    (b) Effect of Change in Altitude on the Transmission of Compressed Air.
    Answer : Pp 13 and 14
12. Write Short notes on the Following.
    (a) Size of Compressor Necessary.
    (b) Diameter of Low Pressure Cylinder.
    Answer : Pp 17


    Chapter 2 Mine Haulage.
13. Write short notes on the Following.
    (a) Trolley Locomotives
    (b) Storage-Battery Locomotives
    Answer : Pp 19 and 20
14. List Down Four General Ways of Driving Battery Locomotives.
    Answer : Ch 2-2 Pp 21
15. Discuss Briefly Diesel Locomotives.
    Answer : Ch 2-3 Pp 25 and 26
16. Describe the Conditions Affecting the Selection of a Locomotive.
    Answer : Pp 26 to 27
17. Discuss Briefly the Followings.
    (a) Track Profile.
    (b) Resistance
    (c) Trailing Load
    Answer : (a) (b) (c) - Pp 30
18. Write Short notes on the Following.
    (a) Rolling Resistance of Locomotive
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    (b) Curve Resistance
    (c) Grade Resistance
    Answer : Pp 30 and 31
19. Discuss Briefly the Following.
    (a) Level Drawbar Pull
    (b) Acceleration and Retardation (Deceleration).
    Answer : Pp 31 and 32
20. Write Short notes on the Following.
    (a) Braking Effort
    (b) Time Per Trip
    (c) Grade Resistance
   Answer : Pp 33 and 34


    Chapter 3 Review of Transportation Systems and Hosting.
21. Explain Briefly the Followings.
    (a) Different Types of Belt Conveyor
    (b) Conventional Trough Belt Conveyors
   Answer : Ch 3.1.1 and 3.1.1.1. Pp 42


22. Write Short notes on the Following.
    (a) Cable Belt Conveyors
    (b) The Enclosed Screw or Auger Conveyor
    Answer : Ch 3.1.1.2 and 3.1.1.4 Pp 43 and 44
23. Discuss about 1 High Angle Conveyor (HAC), 2 Design and System of Conveyors.
    Answer : Ch 3.1.1.6 and 3.1.2. Pp 46
24. Explain Briefly the Principal Conveyor Types-In Secondary and Main-Line Haulage.
    Answer : Ch 3.1.3. Pp 47
25. Discuss about Drum Hoists.
    Answer : Ch 3.2.1.1. Pp 49 and 50
26. Discuss about Split-Differential-Diameter Hoists.
    Answer : Ch 3.2.1.4 Pp 51
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27. Discuss about Friction Hoists
    Answer : Ch 3.2.3. Pp 53
28. Write Short notes in the Followings.
    (a) Hoisting System Design and Selection Criteria
    (b) Duty Cycle Determination.
        Answer : Ch 3.2.4. and 3.2.4.1. Pp 55
    Chapter 4 (Handing of Water for Mining Purpose)
29. Write Short notes in the Followings.
    (a) Drain Tunnels and Ditches
    (b) By-passing and Sealing Off Water
        Answer : Ch 4.1.1 and 4.1.2. Pp 64 and 65
30. Describe about Pumping and Types of Mine Pumps.
    Answer : Ch 4.1.4. and 4.2. Pp 66 and 67
31. Write Short notes in the Followings.
    (a) Air-lift Pump.
    (b) The Sump
         Answer : Ch 4.2.3. and 4.3.1 Pp 70 and 71, 72




                                           End
                   MINISTRY OF SCIENCE AND TECHNOLOGY
         DEPARTMENT OF TECHNICAL AND VOCATIONAL EDUCATION

                                      Sample Questions

                Min 3018 MINE ENVIRONMENTAL ENGINEERING II


1. Discuss briefly the followings:
         (a)   Atmospheric pressure. (Note 24)
         (b)   Mercury barometer. (Note 24)
         (c)   Aneroid barometer. (Note 24)
2. What will the pressure drop be along a 4m × 3m rock tunnel, 1500 m long, when 60 m3/s
   of air at a density of 1.35 kg/m3 is flowing along it? What will the pressure drop be if
   everything remains, except that the air volume is 70 m3/s?     (Note 27 Example)
3. Calculate pressure drop for 4 m3/s of air at 1.2 kg/m3 density that flows along 900 m of
   400 mm diameter ventilation piping. What will the pressure drop be if, under the same
   conditions except a 560mm pipe were used instead of a 400 mm pipe? (Note 27)
4. Explain static pressure, velocity pressure and total pressure. (Note 25)
5. Classify whether a fluid is laminar or turbulent when its flows at 20 m/s in 15 cm.
   diameter circular pipe. Assume the dynamic viscosity of the fluid is 0.3 Ns/m2 and
   density is 1000 Kg/m3. (Note 26; Worked-out example)
6. Find the pressure drop along a 2m × 3m rock tunnel, 2000 m long, when 55 m3/s of air at
   a density of 1.35 kg/m3 is flowing along it. And find the changed pressure drop if
   everything remains, except that the air volume is 60 m3/s? (Note 27)
7. What will the pressure drop be when 3 m3/s of air at 1.2 kg/m3 density flows along 600
   m of 400 mm diameter ventilation piping? Then calculate the new pressure drop if,
   under the same conditions, a 560mm pipe were used instead of a 400 mm pipe? (Note
   27)
8. An airway of 800 m. with no bends 3m.× 2m.dimension. Determine the resistance of
   airway and frictional pressure drop along it when an airflow of 30 m3/s is passing and
   K = 0.0158 Kg / m3. (Note 27; Worked-out example)
9. (a) What is mine ventilation? (Note 6; Worked-out example)
  (b) Explain the purposes of mine ventilation. (Note 6; Worked-out example)
                                                                   2

10. (a) Find the Enthalpy & Sigma heat under the following conditions.
     Air mass, M = 1.0 Kg.
     Water mass, m = 0.007 Kg.
     Temperatures = 13.5 ºC wb. & 20.0 ºCdb.
     (Worked-out example)
   (b) How much heat is required to raise the temperature of 0.1 m3 of bath water from
     15 to 45ºC? (It should be noted that the density of water is 1000 kg/m3.)
     (Worked-out example)
11. Calculate the natural ventilation pressure by using the following data.
                                 Temperature, ºC                          Downcast Shaft                    Upcast Shaft
                  Depth, m




                                                                                                       Temperatures
                                                                                      Density Kg/m3




                                                                                                                      Density Kg/m3
                                                                       Temperatures
                                                   Pressure, kPa
                                 Virgin Rock



                                                   Barometric




                                                                                                           ºC
                                                                       ºC

      Top of                 0         18               81                10/10                 0.99     22/22                0.95
      shaft
      Middle       1000                27               92                16/16                 1.10     27/27                1.05
      of shaft
      Bottom       2000                36             103                 22/22                 1.21     32/32                1.15
      of shaft
      Mean                             27                                 16/16                 1.10     27/27                1.05
           For ease of calculation the air has been assumed to be saturated throughout the circuit.
     (Worked-out example)
12. At what rate is heat removed from 3 m3/s of dry air at sea level density (1.2 kg/m3),
     which enters a cooler at 35ºC and leaves it at 20ºC?
      (Worked-out example; Note 8)
13. (a) Write a short note on Psychrometry. (Note 10; Worked-out example)
   (b) Write a short note with sketches on Celsius scale and Kelvin scale. (Note 2)
14. 150 m3/s of air enters the downcast shaft of a mine at a pressure of 82 kPa and a
     temperature of 17 °C. At the bottom of the shaft the pressure is 115 kPa and the
     temperature 27 °C. How much air will reach the bottom of the shaft if none of it is
     lost due to leakage? (Note 3)
15. Define the dew-point temperature and state how this value can be obtained. (Note 4)
16. People are often confused with the terms “heat” and “temperature”. Explain them
     clearly. State the potential sources of heat affecting the ventilating air. (Note 7)
                                               3

17. How much heat is required to raise the temperature of 0.1 m3 of bath water from 15ºC
     to 45ºC? (It should be noted that the density of water is 1000 kg/m3.) (Note 8)
18. If 300 000 tons of rock are broken per 30-day month in a mine at a depth where the
     average virgin rock temperature is 40ºC and by the time this rock reaches surface in a
     skip it has been cooled to 20ºC, what is the average rate at which heat is released by
     the broken rock?
     If this mine is ventilated by means of 700 m3/s of air at a density of 1.2 kg/m3, by
     how much could this heat increase the temperature of the air? (Note 8)
19. Define the following terms and explain how they can be measured:
       (a) the dry bulb temperature
       (b) the wet bulb temperature
       (Note 11)
20. Explain the obstructions in air ducts that can retard the flow of air. Use necessary
     diagrams to compare the resistance that can occur in different airways. (Note 28)
21. Discuss the different losses that occur due to:
       (a) a bend
       (b) variation in the size of the duct (Note 28)
22. How much air at a density of 1.35 kg/m3 will flow through a 4m × 3m rock tunnel,
     1500 m long, if a pressure difference of 1 kPa exists between the two ends of the
     tunnel? (Note 29)
23. Define natural ventilation and discuss how the natural ventilation pressure can be used
     in various types of mine workings such as hill site opening and connected vertical
     shafts. (Note 30)
24. Explain the following:
     (a) when the flow of a fluid is laminar or turbulent
     (b) how the viscosity of a fluid retract its flow. (Note 26)
25. Determine the pressure drop along a 3m × 2m rock tunnel, 1000 m long, when 40 m3/s
   of air at a density of 1.35 kg/m3 is flowing along it? And find the changed pressure drop
   if everything remains, except that the air volume is 60 m3/s? (Note 27)
26. Define the boiling point of a liquid and state how the water can have different boiling
   points under various conditions. (Note 4)
                                            4

27. Say if a fluid flow is laminar or turbulent when its flows at 30 m/s in 20 cm. diameter
   circular pipe. Assume the dynamic viscosity of the fluid is 0.3 Ns/m2 and density is
   1000 Kg/m3. (Note 26; Worked-out example)
28. There are no bends in an airway which is 900 m long and has 4m × 3m dimension. Find
   the resistance of airway and frictional pressure drop along it when an airflow of 30 m3/s
   is passing and K = 0.0158 Kg / m3. (Note 27; Worked-out example)
29. Explain the following:
       (a) barometric pressures (Note 11)
       (b) dew-point temperature (Note 4)
30. If 10,000 m3 of air at 20 °C is heated to 27 °C at constant pressure, what does its
    volume become? (Note 2)

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