Coal Mining Quiz 4 - 5

In coal stockpiling, which of the following equipment is used in dumping coal into pile?

• Bulldozer

• Conveyors

• Excavator

• Both band c

Which of the following is an important property of coal when used as a metallurgical coke?

• Sulfur

• Ash Content

• Both a and b

• None of the choices

Which of the following impurities of coal is reduced during beneficiation to address environmental issues?

• Carbon

• Nitrogen

• Both a and b

• None of the choices

Which of the following unit operation is part of Coal Handling?

• Coal Transport

• Coal Beneficiation

• Coal Washing

• All of the above

Which of the following separation method is used in coal with ultrafine particle size?

• Gravity Separation

• Dense Medium Separation

• Spiral Concentration

• Froth Flotation

In blasting, this is equivalent to the bench height and subdrill.

• Blasthole

• Hole Length

• Stemming

• Charge Length

In blasting, which of the following is used to compute for the volume of material blasted?

• Powder factor

• Burden

• Subdrill

• Both a and b

Which explosives is used in underground coal mining?

• Permissible explosives

• ANFO

• Water Gels

• All of the above as long as safe to use

In blasting, which of the following is not an initiating device?

• Plain Detonator

• Electric Detonator

• Safety Fuse

• None of the above

Which of the following is prevented in longwall mining?

• Collapse of back in active longwall panel

• Airblast

• Both a and b

• None of the choices