Western Coalfields Interview Questions, Process, and Tips

There are four main types of coal: anthracite, bituminous, subbituminous, and lignite.

• Anthracite is the highest rank of coal and is known for its high carbon content and low moisture and volatile matter.

• Bituminous coal is the most commonly used type and is known for its relatively high heat content.

• Subbituminous coal has a lower carbon content than bituminous coal and is commonly used for electricity generation.

• Lignite...read more

There are several types of gases found in underground mines, including methane, carbon monoxide, hydrogen sulfide, and nitrogen.

• Methane is the most common gas found in underground mines and is highly flammable.

• Carbon monoxide is a deadly gas that can be produced during mining operations.

• Hydrogen sulfide is another toxic gas that can be present in underground mines.

• Nitrogen is often used in mining operations to displace

Mining is the process of extracting valuable minerals or other geological materials from the earth.

• Mining involves drilling, blasting, and extracting minerals from the earth's surface or underground.

• It is essential for the production of various resources like coal, gold, copper, and diamonds.

• Mining can have environmental impacts such as habitat destruction and water pollution.

• Technological advancements have made mining...read more

There are typically three ways to come out in underground mines: shaft, adit, and decline.

• Shaft: Vertical tunnel used for hoisting ore and personnel.

• Adit: Horizontal tunnel used for access to the mine.

• Decline: Inclined tunnel used for moving equipment and ore.

• Examples: The Lucky Friday Mine has a shaft entrance, the Goldstrike Mine has an adit entrance, and the Grasberg Mine has a decline entrance.

It depends on the application and the specific engines being compared.

• In general, four-stroke engines are more fuel-efficient and have better low-end torque.

• Two-stroke engines are lighter and have a higher power-to-weight ratio.

• However, two-stroke engines tend to produce more emissions and require more maintenance.

• Ultimately, the power output of an engine depends on its design and intended use.

• For example, a high-perfo...read more