MINING ENGINEERING GATE PREVIOUS QUESTIONS - 5

1. In a cut-and-fill stope, the main purpose of back filling is to

1. reduce ore dilution
2. prevent high stress concentration in far field domain
3. prevent displacement due to dilation of fractured wall rock
4. improved ore rehandling

2. bypass valve in a compressed oxygen type self contained breathing apparatus is meant to

1. release accumulated nitrogen in the breathing bag
2. release excess pressure in the breathing bag
3. supply oxygen directly to wearer in case pressure reducing valve does not function
4. flush out the apparatus with oxygen on opening the cylinder valve

3. solution of the differential equation dy/dx = ky follow exponential decay (where k is a constant) for x ∈ [0,∞] if

1. k greater than 0
2. k less than 0
3. k = 0
4. k = e

4. which one of the following is the most likely mode of slope failure for waste dump

1. circular
2. wedge
3. plane
4. toppling

5. Cyclone, bag filter and scrubber can be used for control of

1. water pollution
2. air pollution
3. soil pollution
4. noise pollution

6. A mine waste dump of pH 5.2 can be neutralized by adding

1. urea
2. calcium carbonate
3. sulphuric acid
4. sodium chloride

7. In the coward flammability diagram, the perspective percentages of methane and oxygen at the noise limit are

1. 14.2, 0.0
2. 14.1, 18.2
3. 5.8, 12.1
4. 5.0, 19.2

8. if the transpose of matrix is equal to its inverse, then the matrix is

1. symmetric
2. orthogonal
3. skew symmetric
4. singular

9. in the mohrs scale of hardness, the minerals in increasing sequence of hardness are

1. calcite, gypsum, topaz, diamond
2. topaz, gypsum, calcite, diamond
3. calcite, gypsum, diamond, topaz
4. gypsum, calcite, topaz, diamond

10. long hole drilling with crater blasting is used for the construction of

1. winze
2. shaft
3. raise
4. decline