Mining Engineering
GATE MN topic:mineral-processing PYQs
Build your understanding with focused practice from past exam papers.
Questions 291–300 of 650. Imported answers require independent review unless marked reviewed.
Question 31
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In a leveling survey, a reading is taken as 2.25 m. However, along the line of sight there is deflection of 20 cm with respect to vertical position of the staff. The correct reading, in m is ______. (round off to two decimal places)
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Water flows through a vertical sand column of cross sectional area 400 mm² and length 300 mm. For a water head of 600 mm, quantity of seepage water is 100 mm³/min. The hydraulic conductivity of the sand column, in mm/min is ______. (round off to three decimal places)
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The modified Lauffer diagram as shown in the figure relates to roof span, RMR and stand-up time. In a metal mine, roof span of a drive is 4 m. If the RMR of the rock mass changes from 40 to 60, then the stand-up time increases by a factor of ______. (round off to two decimal places)
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In a friction winder, the skip accelerates to a steady speed over a time span of 15 s from the start. The torque vs. time diagram for the winding cycle is shown in the figure. The deceleration time in seconds is ______. (round off to one decimal place)
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At a measurement station, the air quality parameters PM₂.₅, NO₂ and O₃ have the AQI sub-index values as 180, 96, and 84, respectively. The AQI for the station is ______. (in integer)
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Match the drilling pattern with mining operation
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The closest match of the scatter plot between the variables X and Y with the approximate attribute is
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A 3-point borehole extensometer is installed to identify the location of a single discontinuity plane in a hanging wall rock by measuring deformations at three locations as shown in the figure. The absolute readings of deformations measured on two different dates are listed in the table. Based on the measured data the most likely inference is
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Match the semi-variogram shape with the model name and the property.
Shapes P, Q, R and S; models I Pure nugget, II Exponential, III Spherical, IV Gaussian; properties E reaches sill at finite range, F reaches sill asymptotically, G reaches sill instantaneously.
= semi-variogram;
= lag distance.
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In a uniaxial compressive strength test, a rock sample of diameter 50 mm fails at an angle of 60° as shown in the figure. If the peak load at failure is 120 kN, the normal and shear stresses on failure plane respectively, in MPa are ______ and _____.
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