GATE Mining Engineering Practice Quiz

Question 1

In an underground coal mine, which gas is most likely to accumulate near the roof in a poorly ventilated gallery because of its lower density than air and also create an explosion hazard within a specific concentration range?

Accepted Answer

Methane

Question 2

The primary objective of pre-drainage of methane from a coal seam before development is to

Accepted Answer

Reduce in-seam gas content and emission during mining

Question 3

A return airway sample shows oxygen 19.0%, methane 1.2%, carbon dioxide 0.6%, and carbon monoxide 0.01%. Which interpretation is most appropriate?

Accepted Answer

Possible heating or combustion requiring investigation

Question 4

A mine introduces a new diesel fleet underground. According to good safety management practice, which action should be completed before routine deployment to control underground hazard exposure?

Accepted Answer

Conduct management-of-change risk assessment covering ventilation, emissions, fire, and training

Question 5

After a sealed-off fire area in an underground mine is reopened, which condition most strongly indicates danger of a renewed explosion if ignition occurs?

Accepted Answer

Methane and oxygen both within explosive limits

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