Indian Minerology

Blasting & Explosives MCQ Questions - Part 04 💥 Blasting & Explosives MCQ Questions - Part 04 46. A “misfire” in blasting means: A. Excessive vibration B. Failure of charge to detonate C. Overbreak D. Under-charging Show Answer Answer: B. Failure of charge to detonate 47. Misfires must be handled after waiting for: A. 15 min B. 30 min C. 1 hour D. 4 hours Show Answer Answer: B. 30 min 48. The “misfire report” must be submitted to: A. Manager B. DGMS C. Safety Officer D. Both A and B Show Answer Answer: D. Both A and B 49. Most common environmental impact of blasting is: A. Water pollution B. Air pollution by dust and fumes C. Noise and vibration D. All of the above Show Answer Answer: D. All of the above 50. Permitted maximum vibration level for residential area is: A. 10 mm/s B. 25 mm/s C. 50 mm/s D. 100 mm/s Show Answer Answer: B. 25 mm/s 5...

Blasting & Explosives MCQ Questions - Part 05 (Final) 💥 Blasting & Explosives MCQ Questions - Part 05 (Final) 61. DGMS approval for permitted explosives is given after: A. Gallery test B. Field trial C. Laboratory analysis D. All of the above Show Answer Answer: D. All of the above 62. Shotfirer renewal certificate is valid for: A. 1 year B. 2 years C. 3 years D. 5 years Show Answer Answer: C. 3 years 63. Explosive audit in mines is carried out to: A. Verify stocks B. Ensure compliance with safety rules C. Avoid pilferage/theft D. All of the above Show Answer Answer: D. All of the above 64. Rescue teams in explosive accident must first: A. Save equipment B. Ensure site safety and possible gas detection C. Rush inside immediately D. Collect logbook Show Answer Answer: B. Ensure site safety and possible gas detection 65. The principal document for recording...

Blasting & Explosives MCQ Questions - Part 02 💥 Blasting & Explosives MCQ Questions - Part 02 16. Safety fuse burns at an approximate rate of: A. 30 sec/m B. 60 sec/m C. 90 sec/m D. 120 sec/m Show Answer Answer: B. 60 sec/m 17. Delay detonators are used to: A. Prevent misfire B. Achieve sequential blasting C. Increase VOD D. Reduce stemming length Show Answer Answer: B. Achieve sequential blasting 18. Cordtex is a type of: A. Electric detonator B. Non-electric detonator C. Detonating fuse D. Blasting machine Show Answer Answer: C. Detonating fuse 19. Foreman's signal before blasting is usually: A. One whistle B. Two whistles C. Siren or whistle signals as per bye-laws D. No signal required Show Answer Answer: C. Siren or whistle signals as per bye-laws 20. Connecting detonator wires should always be: A. Twisted tightly with bare hands B. Properly i...

Blasting & Explosives MCQ Questions - Part 03 💥 Blasting & Explosives MCQ Questions - Part 03 31. The term “burden” in blasting refers to: A. Depth of borehole B. Distance between row of holes and free face C. Length of stemming D. Spacing between holes Show Answer Answer: B. Distance between row of holes and free face 32. “Spacing” in a blast pattern means: A. Gap between rows B. Distance between adjacent holes in a row C. Depth of hole D. Height of bench Show Answer Answer: B. Distance between adjacent holes in a row 33. V-Pattern (or “chevron”) blasting is effective for: A. Wide benches B. Tunnels/headings C. Vertical shafts D. Stowing galleries Show Answer Answer: B. Tunnels/headings 34. Staggered blast pattern helps to: A. Increase ground vibrations B. Reduce fly rock C. Improve rock fragmentation D. Both B and C Show Answer Answer: D. Both B and C ...

Mine Ventilation MCQ Questions - Part 05 (Final) 🌬️ Mine Ventilation MCQ Questions - Part 05 (Final) 61. In India, who is responsible for enforcement of ventilation rules in mines? A. DGMS B. CIL C. Ministry of Coal D. State Govt Show Answer Answer: A. DGMS 62. As per Coal Mines Regulations, velocity of air in gassy seams should not be less than: A. 0.25 m/s B. 0.5 m/s C. 1.0 m/s D. 2.0 m/s Show Answer Answer: B. 0.5 m/s 63. In fiery seams, what type of fans are mandatory? A. Ordinary fans B. Flameproof electrical fans C. Booster fans only D. Hand fans Show Answer Answer: B. Flameproof electrical fans 64. Which form is required to record statutory ventilation measurements? A. Form 6A B. Form 2 C. Mine Diary D. Rescue Report Show Answer Answer: A. Form 6A 65. Ventilation planning for a new mine is mainly based on: A. Seam thickness B. Production rate & gas em...

Blasting & Explosives MCQ Questions - Part 01 💥 Blasting & Explosives MCQ Questions - Part 01 1. The primary purpose of blasting in mines is: A. To ventilate mine B. To break rock/coal C. To drain water D. To cool air Show Answer Answer: B. To break rock/coal 2. The velocity of detonation (VOD) of permitted explosives is usually: A. 1000–1500 m/s B. 2000–4000 m/s C. 5000–7000 m/s D. Above 8000 m/s Show Answer Answer: B. 2000–4000 m/s 3. The main oxidiser used in ANFO explosive is: A. Sodium nitrate B. Ammonium nitrate C. Potassium chlorate D. Calcium nitrate Show Answer Answer: B. Ammonium nitrate 4. Detonating fuse generally contains: A. TNT core B. PETN core C. Gunpowder core D. ANFO core Show Answer Answer: B. PETN core 5. Electric detonators work by: A. Flame heating B. Electric current heating bridge wire C. Manual striking D. Gas pressure Show...

Mine Ventilation MCQ Questions - Part 04 🌬️ Mine Ventilation MCQ Questions - Part 04 46. Ventilation “leakage” in mines means: A. Fresh air supply B. Air short-circuiting through stoppings/doors C. Recirculation D. None Show Answer Answer: B. Air short-circuiting through stoppings/doors 47. High leakage reduces: A. Fan efficiency B. Ventilation effectiveness C. Both A and B D. None Show Answer Answer: C. Both A and B 48. Which construction is mainly used to reduce leakage in galleries? A. Brattices B. Stoppings C. Air crossing D. Trap doors Show Answer Answer: B. Stoppings 49. Temporary stoppings are generally made of: A. Brick masonry B. Concrete C. Brattice cloth or wooden boards D. RCC wall Show Answer Answer: C. Brattice cloth or wooden boards 50. Permanent stoppings should be constructed from: A. Masonry / Brick wall / RCC B. Cloth C. Canvas brattice D. None Show...

Mine Ventilation MCQ Questions - Part 03 🌬️ Mine Ventilation MCQ Questions - Part 03 31. A common method of ventilation survey in mines is: A. Pressure/quantity measurement B. Dust Sampling C. Explosive survey D. Liquid testing Show Answer Answer: A. Pressure/quantity measurement 32. Tracer gas method is used to measure: A. Air quantity B. Ventilation leakage C. Fan efficiency D. Gas drainage Show Answer Answer: B. Ventilation leakage 33. Methanometer is used to measure: A. Air velocity B. Methane percentage C. Oxygen percentage D. Dust concentration Show Answer Answer: B. Methane percentage 34. Flame safety lamp is primarily used for: A. Lighting B. Detection of firedamp C. Detect oxygen depletion D. Both B and C Show Answer Answer: D. Both B and C 35. Psychrometer is used to measure: A. Air pressure B. Air humidity / wet bulb temperature C. Gas dilution rate D. Dust ...

Mine Ventilation MCQ Questions - Part 01 🌬️ Mine Ventilation MCQ Questions - Part 01 1. The main purpose of mine ventilation is: A. To cool machinery B. To provide fresh air and dilute gases C. To improve illumination D. To drain water Show Answer Answer: B. To provide fresh air and dilute gases 2. Which gas is called "firedamp" in mines? A. Methane B. Carbon Monoxide C. Nitrogen D. Hydrogen Show Answer Answer: A. Methane 3. The normal oxygen percentage in mine air should be at least: A. 14% B. 16% C. 19% D. 21% Show Answer Answer: D. 21% 4. Blackdamp in mines is a mixture of: A. CO + CH4 B. CO2 + N2 with low oxygen C. SO2 + O2 D. Only nitrogen Show Answer Answer: B. CO2 + N2 with low oxygen 5. Which unit is used to measure airflow in mines? A. m/s B. m³/s or m³/min C. Pascal D. kg/m³ Show Answer Answer: B. m³/s or m³/min 6. The ...

Mine Ventilation MCQ Questions - Part 02 🌬️ Mine Ventilation MCQ Questions - Part 02 16. Air Quantity (Q) in mine ventilation is given by: A. Q = v × A B. Q = p/h C. Q = R × L D. None Show Answer Answer: A. Q = v × A (velocity × area) 17. The instrument used to measure mine air pressure is: A. Manometer B. Anemometer C. Hygrometer D. Psychrometer Show Answer Answer: A. Manometer 18. The main mine fans are generally installed at: A. Pit top (Surface) B. Underground face C. Inside gob D. On haulage road Show Answer Answer: A. Pit top (Surface) 19. Which type of fan is commonly used as a main mine fan? A. Centrifugal Fan B. Propeller Fan C. Axial Flow Fan D. Roof Fan Show Answer Answer: C. Axial Flow Fan 20. Booster fans are used for: A. Increasing airflow in districts B. Main ventilation only C. Cooling equipment D. Rescuing persons Show Answer Answer: A. Increasing air...

Mining Safety MCQ Questions - Part 04 ⛑️ Mining Safety MCQ Questions - Part 04 46. Which gas is the primary cause of most mine explosions? A. Carbon monoxide B. Methane C. Hydrogen D. Nitrogen Show Answer Answer: B. Methane 47. What is the permissible limit of methane in return airways? A. 0.5% B. 1.0% C. 1.25% D. 2.0% Show Answer Answer: C. 1.25% 48. Methane drainage in mines is usually done by: A. Blasting B. GOB wells / boreholes C. Sand filling D. Water infusion Show Answer Answer: B. GOB wells / boreholes 49. A refuge chamber must be designed to provide life support for at least: A. 4 hours B. 8 hours C. 24 hours D. 48 hours Show Answer Answer: C. 24 hours 50. In case of fire, the primary safe direction of escape is towards: A. Return airway B. Intake airway C. Goaf D. Shaft bottom Show Answer Answer: B. Intake airway 51. Which gas is called “afterdamp”? ...