Drilling and Blasting MCQs Questions & Answers

Drilling and Blasting MCQs Questions & Answers | Mining Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Drilling and Blasting. These resources are available for mining engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Drilling and Blasting chapter is particularly important for students studying mining engineering. Page-2 section-2

Spacing to burden ratio is normally kept at . . . . . . . .

A) 1.2 B) 1.5 C) 1 D) 2

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Answer & Solution

Answer: Option A

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In case of opencast working where any part of a public road or railway lies within the danger zone then there are some conditions imposed on charging or firing under current CMR 2017. Which of the following do not come under these conditions?

A) two persons are posted one each in either extreme points of such road, railway B) they should have efficient telephonic communication system C) they must have loud speakers or other means of intimating traffic D) the charging or firing is not possible unless permission is obtained from PWD or Railway authority prior to such activity

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Answer & Solution

Answer: Option D

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A roadway in stone connecting two or more coal seams is called . . . . . . . .

A) Tunnel B) Gallery C) Drift D) Throw

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Answer & Solution

Answer: Option C

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A flame proof enclosure is used for electrical apparatus at higher voltage exceeding . . . . . . . . volts.

A) 15 B) 20 C) 25 D) 30

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Answer & Solution

Answer: Option C

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A cylinder of oxygen is of 2.5 Iit capacity holding oxygen under a pressure of . . . . . . . . bars.

A) 100 B) 50 C) 250 D) 200

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Answer & Solution

Answer: Option D

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The increase in quantity of air due to expansion in the up cast shaft can be roughly taken as . . . . . . . .

A) 1% for every 15 m B) 5% for every 100 m C) 1% for every 100 m D) 1% for every 50 m

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Answer & Solution

Answer: Option C

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Number of shelves in heavy weight barrier.

A) 6 B) 10 C) 16 D) 24

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Answer & Solution

Answer: Option C

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CO/O₂ deficiency ratio is . . . . . . . . normal to coal mine.

A) 0.1 to 0.5% B) 0.5 - 0.8% C) 0.8 to 1% D) 0.0 - 0.3%

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Answer & Solution

Answer: Option A

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Quantity of air at the working face can be increased by introducing.

A) Regulator B) Air crossing C) Compressed air jets D) Doors

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Answer & Solution

Answer: Option C

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When O₂ falls to 5% or less and methane rises to 30% N more behind the stopping, the samples collected at intervals of . . . . . . . .

A) 48 hours B) 8 hours C) 16 hours D) 24 hours

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Answer & Solution

Answer: Option A

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