GATE MN format:nat PYQs & Answers — Page 26 — Exam Papers

Questions 251–260 of 300. Imported answers require independent review unless marked reviewed.

Topic practice 300 questionsPage 26 of 30

Economic feasibility of two methods is examined for meeting a targeted mine production. On a yearly basis, the following cost parameters (Rs in crores) are applicable for these methods.

	Method 1	Method 2
Fixed cost	20	5
Variable cost	2X

The annual rate of production, ‘X’ in million tonnes for which both the methods will yield the same operating cost is ____________________.

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A person standing 50 m away from an HEM experiences 90 dB sound pressure level. If the person moves to a new location that is 70 m away from the HEM, the sound pressure level experienced by the person, in dB, becomes ____________________.

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A portion of a ventilation system has two splits as shown. Split ‘A’ has a resistance of

and a regulator of size 2.0

. The resistance of split ‘B’ in

is _________.

Diagram for Mining Engineering question 37

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Air enters a bord and pillar panel at 10 ppm CO and 20.78% O

. The air at the panel return has 80 ppm CO and 20.52% O

. The ‘Graham’s ratio’ for the status of fire in the panel in % is ____________________.

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In a sublevel stope, 20 m high excavation is made with ring drilling in a 6 m wide orebody. In an effective shift time of 6 hrs, three rings are blasted resulting in 9 m extraction length. LHDs of 5.0

bucket capacity and cycle time of 5 minutes are used for ore transportation. The number of LHDs required for this operation is _________________.

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A coal seam lying at a depth of 200 m is developed by bord and pillar method. Pillars are 30 m centre to centre with a gallery width of 4 m. Unit weight of the overlying strata is 28

. If the pillar strength is 9.32 MPa, the factor of safety of pillar is ___________.

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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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