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- Question 1 of 17
Identify the correct statement.
NONEL is used for surface connection of the blast holes in order toCorrectIncorrect
- Question 2 of 17
Identify the initiation sequence which is NOT possible for surface blasting.CorrectIncorrect
- Question 3 of 17
Parallel holes at right angles to the face with some holes uncharged are associated with the following shot hole patternCorrectIncorrect
- Question 4 of 17
Bieniawski’s Rock Mass Rating considers the parameters: RQD, spacing of joints, condition of joints, ground water condition, andCorrectIncorrect
- Question 5 of 17
A rockmass is subjected to hydrostatic pressure of 6 MPa. If each of the measured strains Exx=Eyy=Ezz , is 2.0 mm/m, then the bulk modulus, in GPa, isCorrectIncorrect
- Question 6 of 17
A longwall panel of width 120 m is extracted at a depth of 200 m. Critical subsidence is reached when the panel length becomes 150 m. If the seam were to be worked at a depth of 300 m, critical subsidence would be observed at a panel length, in m, ofCorrectIncorrect
- Question 7 of 17
The support system followed along the goaf edge in a depillaring panel isCorrectIncorrect
- Question 8 of 17
Which one of the following ropes CANNOT be an effective cable bolt?CorrectIncorrect
- Question 9 of 17
In metalliferous mines, the sublevel interval does NOT depend onCorrectIncorrect
- Question 10 of 17
Jack hammer does NOT containCorrectIncorrect
- Question 11 of 17
At the inlet of a mine roadway, the dry and wet bulb temperatures of air are 38 degreeC and 29 degreeC, respectively. At the outlet, the corresponding temperatures are degree and 29 degreeC, respectively. The process of heat transfer in the airway is described asCorrectIncorrect
- Question 12 of 17
Underground coal mines are in principle ventilated by exhausting system, so thatCorrectIncorrect
- Question 13 of 17
Identify the WRONG statement.
Pit bottom air lockCorrectIncorrect
- Question 14 of 17
Identify the WRONG statement.
The ‘temperature inversion’ of the atmosphere in surface mines aggravates the problem ofCorrectIncorrect
- Question 15 of 17
In a CO self rescuer, the purpose of the calcium bromide and lithium chloride mixture is toCorrectIncorrect
- Question 16 of 17
IRR of a project is the discount rate at whichCorrectIncorrect
- Question 17 of 17
The three axes comprising the numerical codification of resources, as per the UNFC, areCorrectIncorrect