Coal Mining MCQs Questions & Answers | Mining Engineering

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1.
Extraction of coal by caving system may be permitted upto a thickness of . . . . . . . . m only.

A. 3 m

B. 3.6 m

C. 4.2 m

D. 4.8 m

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2.
Sub level caving should be done with

A. Advance

B. Retreat

C. Both A and B

D. None

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3.
The type of boring suitable for drilling holes angle

A. Clolled shot

B. Churn drilling

C. Diamond

D. Percessive

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4.
The type of pumps generally used for dewatering of shaft sinking

A. Axid flow

B. Mono pumps

C. Centrifugal

D. Turbine pumps

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