GATE MN purpose:exam-prep PYQs & Answers — Page 37

Questions 361–370 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 37 of 65

In a bord and pillar panel six shuttle cars, each of 10 tonne capacity, are deployed to transport coal produced by two continuous miners to a belt conveyor. Each shuttle car on an average carries 80% of its rated capacity and makes 7 round trips in an hour. The belt conveyor has a capacity such that the effective material cross section area is of 0.09 m² and runs at a speed 1.1 m/s. The broken coal has a bulk density of 1.2 tonne/m³. The ratio between the production and the capacity of the belt conveyor, in percent is

Your answerChoose one option.

65.46

71.42

78.56

82.46

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With reference to the figure related to rock cutting by point attack tool, match the angle with corresponding name.

Diagram for Mining Engineering question 27

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P-2, Q-4, R-1, S-3.

P-4, Q-2, R-1, S-3.

P-2, Q-4, R-3, S-1.

P-4, Q-2, R-3, S-1.

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The pit bottom in a correlation survey is shown in the figure. Points C and D represent two suspended wires. The bearing of line CD is 286°00′00″ and its length is 4.64 m. The angle CED is measured as 00°00′40″. The length of line DE is 5.46 m. Considering the Weisbach triangle method, the bearing of the line CE is

Diagram for Mining Engineering question 28

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286°00′47″

285°59′12.9″

286°00′40″

285°00′47.1″

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A dump truck moves up an incline of 5⁰ with constant tractive force of 800 kN. The gross mass of the truck is 250 tonne and its rolling resistance is 545 kN. The acceleration due to gravity is 10 m/s². The time required, in s, to reach a speed of 3.3 m/s from 1.0 m/s is

Your answerChoose one option.

22.0

15.5

3.3

0.2

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In a longwall panel, face is supported with shields of yield capacity 460 tonne per shield. The distance from the canopy tip to coal face is 0.15 m when the support is fully advanced. The depth of the web is 0.60 m. The shields are set skin to skin at the face. Length of the canopy of the shield is 3.25 m and width 1.5 m. Setting capacity is 80% of the yield capacity. The setting resistance at the maximum and minimum span of the coal face, in tonne/m², respectively are

Your answerChoose one option.

61.33 and 72.15.

63.72 and 75.48.

76.66 and 90.19.

91.99 and 108.22.

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A 10 ml sample of wastewater is diluted with water having no BOD, to fill a 300 ml BOD bottle. The initial DO of the diluted waste water is 9.0 mg/l. If the BOD₅ of the waste water sample is 60 mg/l, the final DO of the diluted waste water in mg/l, is

Your answerChoose one option.

5.0

6.0

7.0

8.0

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The Mohr circle of stress of a dry porous rock is shown in the figure. If the rock is fully saturated with a pore pressure

, then the Mohr circle takes the form of

Diagram for Mining Engineering question 32

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Diagram for Mining Engineering question 32 (figure 2)

Diagram for Mining Engineering question 32 (figure 3)

Diagram for Mining Engineering question 32 (figure 4)

Diagram for Mining Engineering question 32 (figure 5)

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The straight line shown depicts the failure criterion of a rock type. The values of stress at points A and B are as shown. The safety factor at the points A and B respectively are

Diagram for Mining Engineering question 33

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1.175 and 0.755.

1.324 and 0.851

0.851 and 1.324

0.755 and 1.175

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Figure shown relates to the manufacture of roof bolts. With respect to the cost/revenue vs production level, match the appropriate trend line with corresponding description. Lines A, B and C are shown against production level and cost/revenue.

Diagram for Mining Engineering question 34

Match: Line (P) A, (R) B, (S) C; Item (1) Total cost, (2) Indirect operating cost, (3) Revenue.

Your answerChoose one option.

(P)-(1); (R)-(3); (S)-(2).

(P)-(2); (R)-(1); (S)-(3).

(P)-(1); (R)-(2); (S)-(3).

(P)-(3); (R)-(1); (S)-(2).

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The value of

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GATE MN purpose:exam-prep PYQs

Question 26

Question 27

Question 28

Question 29

Question 30

Question 31

Question 32

Question 33

Question 34

Question 35