GATE MN exam:gate PYQs & Answers — Page 58 — Exam Papers

Questions 571–580 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 58 of 65

Following information about a longwall retreating panel is given. Panel length = 1800 m Face length = 150 m Depth of web = 0.6 m Shearer travels at a speed of 1.5 m/min along the face. Each cutting cycle requires a non-operational time of 2 h 20 min. The panel is fully extractable. The number of working days required to extract the panel is ______________.

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In a direct rope haulage operating along a 1500 m long incline, 180 tonne of coal is hauled in 7 hours. The average rope speed is 7.5 km/h. The set changing time for the tubs is 2 minutes each at the top and bottom of the incline. If the tub capacity is 1.0 tonne, the number of tubs in the set is ____________________.

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An SDL of 1.0 tonne capacity operates with a cycle time of 6 minutes. The dimension of the face is 4 m x 3 m. Five blasts are conducted per shift with an average pull of 1.2 m. If the density of blasted coal is 0.8 tonne/m

, the time required by the SDL in the shift to lift all the prepared coal in hours is ____________________.

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A force diagram is shown below. Considering clockwise moments to be positive, the resultant moment about A in Nm is ________________.

Diagram for Mining Engineering question 44

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The experiment to determine permeability of a soil sample is illustrated below. The cross-sectional area of the sample is 20.0

. The permeability of the soil sample in cm/s is ____________.

Diagram for Mining Engineering question 45

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In underground face blasting, the pull is found to be 10% less than the drillhole length. The headings of 3.6 m width are supported by prop density of 1.44/m

. The hole length is 1.5 m, and 6 rounds of blasting are done in the panel per shift. The number of props to be erected in a shift is ____________________.

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The immediate roof of a mine is supported by bolts of length 1.5 m, arranged in 1.2 m x 1.2 m grid pattern. If the unit weight of roof rock is 2.25 tonne/m

and load carrying capacity of each bolt is 7.5 tonne, the factor of safety of the support system is ________________.

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In a level terrain, a vertical orebody of 20 m uniform width is worked by surface mining method. The density of the ore is 2.5 tonne/m

. The ultimate pit has a depth of 60 m, width of 20 m at pit bottom, and a pit slope of 45°. The overall stripping ratio for this condition in m

/tonne is ____________________.

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A 20 m long steel tape used for survey is found to be short by 10 cm. If the area measured with the steel tape is 500

, the actual area in

is ____________________.

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The following figure shows the designed blast pattern of a bench. The explosive column is charged at 18 kg/m. If the unit weight of the blasted material is 2.5 tonne/m

, the powder factor for the blast in tonne/kg is ____________.

Diagram for Mining Engineering question 50

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