Mining Engineering
GATE MN Mine Development PYQs
Build your understanding with focused practice from past exam papers.
Questions 11–20 of 40. Imported answers require independent review unless marked reviewed.
Question 65
Open questionMNNAT2 marksNeeds review
In a development coal face, 12 holes are drilled and charged with explosive. Holes are initiated with electric delay detonators connected in series. The length of a detonator lead wire is 1.5 m. The length of the blasting cable is 120 m.
Data are as given:
Resistance of each detonator: 1.48 Ω
Resistance of lead wire: 0.04 Ω/m
Resistance of one wire of the blasting cable: 0.009 Ω/m
The total resistance of the circuit in Ω, is _____. (round off up to 2 decimals)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 12
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The blast pattern of a coal face shown in the figure represents____
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 60
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A surface mine blast pattern has spacing 4 m and burden 3 m. The diameter of the drill hole is 110 mm. The drilling length is 8.8 m including subgrade of 10%. The bulk explosive density is 900 kg/m³.
If the powder factor is 2.5 m³/kg, the charge length in m is _____.
[rounded off to 2 decimal places]
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 16
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The drilling technique applicable for mineral exploration is
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 19
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A square pattern of blast is shown in the figure. For the case of simultaneous blast, identify the zone of no fragmentation
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Match the drilling pattern with mining operation
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 45
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Following information is given for a drilling operation to be carried out for overburden removal in a surface mine.
Parameter | Value |
|---|---|
Volume of rock blasted per round, m³ | 3,20,000 |
Number of blast holes | 100 |
Drill hole diameter (D), mm | 200 |
Length of subgrade drilling | 8D |
Stemming length | 25D |
Bench height, m | 30 |
Powder factor, m³/kg | 3.2 |
The amount of explosive per unit length of charge in kg/m, is ______. (round off to two decimal places)
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The oxygen-balanced equation for explosive ANFO is given below.
For 100 litre of fuel oil having density 850 kg/m³, the amount of ammonium nitrate to be mixed, in kg, is ______. (round off to two decimal places)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 54
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In a bord and pillar development panel, headings of 4.4 m × 2.5 m are advanced using solid blasting. The average pull per round of blast is 1.2 m. On an average 12 faces are blasted per day. Density of coal is 1500 kg/m³. The mine operates in three shifts. If the average daily employment is 330 persons, labour productivity (OMS) of the panel in tonne, is ______. (round off to two decimal places)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 1
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Tricone roller bit is used with
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