Coal Mining — Part 2 MCQs with Explanations

100 is the correct answer to “With AFC the length of single unit face commonly”. This question is standard in competitive examination syllabi for Coal Mining.

1 in 5 is the correct answer to “Face along the strike prefarable for stowing in seams dipping more than.”. This question is standard in competitive examination syllabi for Coal Mining.

50mm is the correct answer to “The water garland segments provided with outlet hole into which screwed a nipple for . . . . . . . . mm diameter drain pipe”. This question is standard in competitive examination syllabi for Coal Mining.

Hirch back method is the correct answer to “For retreating L/W and B. P workings, only suitable method of methane drainage is”. This question is standard in competitive examination syllabi for Coal Mining.

2 - 3 drills is the correct answer to “No. of drills employed in shaft sinking”. This question is standard in competitive examination syllabi for Coal Mining.

4.5m is the correct answer to “In India coal seams over . . . . . . . . m thick are considered as thick seams.”. This question is standard in competitive examination syllabi for Coal Mining.

Dining series is the correct answer to “Top most horizon of tertiary succession in Assam is known as”. This question is standard in competitive examination syllabi for Coal Mining.

18 is the correct answer to “How many coal seams belong to Barakar formation”. This question is standard in competitive examination syllabi for Coal Mining.

Carbon steel is the correct answer to “Drill rods made of”. This question is standard in competitive examination syllabi for Coal Mining.

4 - 6m is the correct answer to “The width of the rooms in room and pillar method may be”. This question is standard in competitive examination syllabi for Coal Mining.

Ripper type is the correct answer to “The tunneling machine employed in hard rock should be”. This question is standard in competitive examination syllabi for Coal Mining.

54 is the correct answer to “The core (dia in mm) size obtained with NX size”. This question is standard in competitive examination syllabi for Coal Mining.

1-c, 2-d, 3-a, 4-b is the correct answer to “Match the following: 1. Thickseam Extraction a. Double Unit Face 2. Bord and Pillar Extraction b. Jet Pearcing 3. Longwall Face Development c. Inclined Slicing 4. Hydraulic Mining d. Half Moon”. This question is standard in competitive examination syllabi for Coal Mining.

3m is the correct answer to “The minimum distance between two sections should be if one working at floor and one at top.”. This question is standard in competitive examination syllabi for Coal Mining.

Rise is the correct answer to “Depillaring operations conducted from dip to . . . . . . . .”. This question is standard in competitive examination syllabi for Coal Mining.

300 is the correct answer to “Room and pillar mining employed at depth below . . . . . . . . meters.”. This question is standard in competitive examination syllabi for Coal Mining.

25mm is the correct answer to “The core sizes whose wire line drilling technique is adopted are for BX holes”. This question is standard in competitive examination syllabi for Coal Mining.

1 is the correct answer to “Barrier in between panels is preferably puncture at 'A' number of places. 'A' is given by”. This question is standard in competitive examination syllabi for Coal Mining.

Jack hammer is the correct answer to “Dewatering can be done by using the drill machines like”. This question is standard in competitive examination syllabi for Coal Mining.

Metamorphic rocks is the correct answer to “Rock formed by errosion, weathering, transportation and ultimately deposition of pre-existing rock”. This question is standard in competitive examination syllabi for Coal Mining.

60 - 90m2 is the correct answer to “Maximum roof exposure for caving is”. This question is standard in competitive examination syllabi for Coal Mining.

1 to 3 is the correct answer to “The front abutment exertsa peak pressure . . . . . . . . meters in advance of the L/W face”. This question is standard in competitive examination syllabi for Coal Mining.

1 is the correct answer to “The water tank have a capacity required for hydraulic stowing . . . . . . . . days requirement of water.”. This question is standard in competitive examination syllabi for Coal Mining.

Miocene period is the correct answer to “Lignite deposits in tertiary rocks of Neyveli is of”. This question is standard in competitive examination syllabi for Coal Mining.

1 - 3 m is the correct answer to “Seam thickness suitable for plough operation.”. This question is standard in competitive examination syllabi for Coal Mining.

All of these is the correct answer to “Stowing pipe range consists of mainly . . . . . . . .”. This question is standard in competitive examination syllabi for Coal Mining.

Line of goaf is the correct answer to “The line passing through all the corners of the stook under extraction at a time called”. This question is standard in competitive examination syllabi for Coal Mining.

Increases flow is the correct answer to “By installation of booster punp instowing causes”. This question is standard in competitive examination syllabi for Coal Mining.

38 mm2 is the correct answer to “Area of cross section of steel rods are”. This question is standard in competitive examination syllabi for Coal Mining.

Exploratory drilling is the correct answer to “Double tube core barrel helps in”. This question is standard in competitive examination syllabi for Coal Mining.

Strong thick massive sand stone is the correct answer to “Over riding of pillars, premature collapse cover due to presence of”. This question is standard in competitive examination syllabi for Coal Mining.

L/W in lifts is the correct answer to “The best method of mining in seam of 4.8 m thick, 500 m deep and massive sand stone roof.”. This question is standard in competitive examination syllabi for Coal Mining.

Cavitations is the correct answer to “In sand stowing incorrect profile will effect”. This question is standard in competitive examination syllabi for Coal Mining.

Product holes is the correct answer to “The holes to be treated with chemicals known as”. This question is standard in competitive examination syllabi for Coal Mining.

300 is the correct answer to “The percussive drilling is applicable upto a maximum depth of . . . . . . . . m.”. This question is standard in competitive examination syllabi for Coal Mining.

Ratio between the quantity of water pumped and ton of coal raised is the correct answer to “The water bearing quality of seam is measured by the”. This question is standard in competitive examination syllabi for Coal Mining.

3, 7 is the correct answer to “In hydraulic sand stowing the throw of the sand without nozzle is . . . . . . . . m and with nozzle is . . . . . . . . m.”. This question is standard in competitive examination syllabi for Coal Mining.

All these is the correct answer to “The purpose of boring is”. This question is standard in competitive examination syllabi for Coal Mining.

1.5 - 2 Kgf/cm2 is the correct answer to “The pressure on diamonds is between during drilling”. This question is standard in competitive examination syllabi for Coal Mining.

100 - 750 mm is the correct answer to “Chilled shot drilling suitable for drilling vertical and large diameter holes of”. This question is standard in competitive examination syllabi for Coal Mining.