GATE MN year:2017 PYQs & Answers — Page 3

Questions 21–30 of 65. Imported answers require independent review unless marked reviewed.

The results of the crossing point temperature experiments for coal A and B are shown in the figure.

Diagram for Mining Engineering question 21

The correct interpretation of the plot is that

Your answerChoose one option.

coal A is more prone to spontaneous heating than coal B

coal B is more prone to spontaneous heating than coal A

coal A is more prone to coal dust explosion than coal B

coal B is more prone to coal dust explosion than coal A

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The “yellow boy” formed due to acid mine drainage mainly consists of

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Ferrous hydroxide

Ferrous sulfate

Ferric hydroxide

Ferric sulfate

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A double ended ranging drum shearer is employed in a longwall mine of face length 150 m. The mining height is 3.5 m and depth of the web cut is 0.76 m. The cycle time for unidirectional cutting is 40 min. Considering bulk density of the coal to be 1.4 t/m

, hourly production from the face in tonne is ________

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The strength of a stranded wire rope is proportional to

Your answerChoose one option.

the diameter of the rope

square of the diameter of the rope

square root of the diameter of the rope

inverse of the diameter of the rope

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A 20 m thick and 30 m wide confined aquifer has two monitoring wells spaced 500 m apart along the direction of groundwater flow. The difference in water level between the wells is 2 m. The hydraulic conductivity is 50 m/day. The rate of flow in m³/day is

Your answerChoose one option.

120

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The y intercept of the tangent of curve

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A rectangle has two of its corners on the x axis and the other two on the parabola

. The largest area of the rectangle is

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The area of cross-section (x) of four rock samples and the respective applied loads (y) at failure under uniaxial loading are given below:

| x (cm²) | 7 | 10 | 13 | 16 | | y (kN) | 35 | 45 | 60 | 80 |

If the best fit line

represents the above data, the coefficient of determination (

) of the best fit line is

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The following readings refer to a reciprocal leveling at staff stations A and B respectively:

| Instrument station | Staff reading A (m) | Staff reading B (m) | Remarks | | P | 1.725 | 2.835 | RL of A = 125.0 m | | Q | 0.835 | 1.545 | |

The reduced level (RL) of staff station B in m is

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The areas within the contour lines of a proposed site for an overburden dump are as follows:

| Contour RL (m) | Area (m²) | | 195 | 3054 | | 180 | 3025 | | 165 | 2095 | | 150 | 2008 | | 135 | 2000 | | 120 | 1992 |

The total volume of overburden in cubic meter that could be dumped within the 120 m and 195 m contour levels is

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GATE MN year:2017 PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30