Drilling And Blasting MCQ

Test your knowledge with important Drilling And Blasting MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Drilling And Blasting MCQs at Bissoy

• All stone dust barriers shall be examined in . . . . . . . .
  ক

  Every week

  খ

  Every day

  গ

  Every 14 days

  ঘ

  Every month
• Which type of device is recommended for good core recovery from soft rock?
  ক

  Single tube core barrel

  খ

  Double tube core barrel

  গ

  Saw toothed crown

  ঘ

  Roller bits
• Silica gel in gas mask removes . . . . . . . .
  ক

  Ammonia and water vapour

  খ

  CO

  গ

  Smoke

  ঘ

  CaCl₂
• In a sealed off fire area as the O₂ of the trapped mine air consumed its pressure becomes less than the atmospheric air of the mine and fresh air leaks in to fire area, called.
  ক

  Sneezing

  খ

  Breathing

  গ

  Hissing

  ঘ

  Outburst
• Conditions for deep hole blasting shall be specified in a general order by whom?
  ক

  DMS

  খ

  CI

  গ

  CM

  ঘ

  SO
• Every shot-firing apparatus needs to be tested at what minimum intervals as stated in CMR 2017?
  ক

  Once in every month

  খ

  Once in every 3 months

  গ

  Once in every 6 months

  ঘ

  Once in every 12 months
• Cactus grab is employed in . . . . . . . .
  ক

  Shaft sinking

  খ

  Tunnelling

  গ

  Bord and pillar mining

  ঘ

  Longwall mining
• A rescue station is under the control of . . . . . . . .
  ক

  Brigades

  খ

  Manager

  গ

  Superntendent

  ঘ

  Owner
• Class 8 group explosives are
  ক

  GN

  খ

  NG

  গ

  LOE

  ঘ

  OCG
• Ventilation survey means
  ক

  Quality survey

  খ

  Quantity survey

  গ

  Both A and B

  ঘ

  Pressure survey
• The weight of spiral - 2C apparatus.
  ক

  2.3 kg

  খ

  3.3 kg

  গ

  4.5 kg

  ঘ

  3.8 kg
• The constant feed rate of BG 174 apparatus is . . . . . . . . It/min.
  ক

  2

  খ

  1.8

  গ

  1.5

  ঘ

  1.2
• If the $$\frac{{CO}}{{{O_2}}}$$ deficiency ratio is 3% or more it indicates . . . . . . .
  ক

  Existance of self heating

  খ

  Gradual oxydation

  গ

  Heating in advanced stage

  ঘ

  Active fire
• Coal more liable to spontanious heating when thesebands present
  ক

  Vltrain

  খ

  Durain

  গ

  Fusain

  ঘ

  Clairain
• When coal dust propagates explosion . . . . . . . . as in case of gas explosion.
  ক

  Flame back

  খ

  Flame up

  গ

  Flame down

  ঘ

  Flame front
• Water infusion is one of the method of prevention of dust at the faces.
  ক

  No

  খ

  Yes

  গ

  Some times No and sometimes correct

  ঘ

  None
• For introduction of solid blasting need apporval from DGMS for exemption under following regulation.
  ক

  173

  খ

  175

  গ

  168

  ঘ

  All
• The pressure of forcing fan has effect of keeping the gases in . . . . . . . .
  ক

  Face

  খ

  Goaf andold workings

  গ

  Junctions

  ঘ

  Raises
• In very thick seams the thickness of coal is . . . . . . . .
  ক

  1.5m - 4.5

  খ

  4.5 - 9

  গ

  1.2 - 2m

  ঘ

  Beyond 9m
• Laboratory experiments proved, suddenly comprising gas air mixture of containing as low as . . . . . . . . % and as high as . . . . . . . . % firedamp can be ignited and made explosive both the temp. and pressure raised simultaniously.
  ক

  2%; 75%

  খ

  3%; 80

  গ

  2.5; 65

  ঘ

  5; 79%
• If the patient needs more than 30 1/min., draws additional air through the . . . . . . . . value on the mask, in reviving apparatus.
  ক

  Outle

  খ

  Byepass

  গ

  Reducing

  ঘ

  Inlet
• A person inhales . . . . . . . . 1/min, the O₂ consumption . . . . . . . . 1/min, when doing hard work in pauses.
  ক

  40 - 50; 1.8 - 2.3

  খ

  60 - 90; 2.7 - 4

  গ

  15 - 20; 0.6 - 0.9

  ঘ

  None
• The quantity of air has to be increased from 1500m³ to 3000 m³/mm, what will be effect on H. P of the fan.
  ক

  2

  খ

  4

  গ

  8

  ঘ

  16
• Shape factor is defined by . . . . . . . .
  ক

  $$\frac{{{\text{Perimeter}}}}{{{{{\text{(Area)}}}^{\frac{1}{2}}}}}$$

  খ

  $$\frac{{{\text{Perimeter}}}}{{{\text{Area}}}}$$

  গ

  $$\frac{{{\text{Perimeter}}}}{{{{{\text{(Area)}}}^{\frac{1}{3}}}}}$$

  ঘ

  $$\frac{{{\text{Perimeter}}}}{{{{{\text{(Area)}}}^{\frac{1}{4}}}}}$$
• The coolest used in 1 hr. apparatus of proto mark V apparatus.
  ক

  MNCl₂

  খ

  Soda phosphate

  গ

  CaCl₂

  ঘ

  NHCl₂
• Minimum quantity of air required for ventilation of coal mine depends on
  ক

  Production of coal

  খ

  Man power employed

  গ

  Cooling power

  ঘ

  All
• Permitted explosives used in mines have a VOD ranging from in m/sec.
  ক

  1000 - 1500

  খ

  2500 - 5000

  গ

  6000 - 8000

  ঘ

  5000 - 6000
• The fan efficiency is given by . . . . . . . .
  ক

  $$\frac{{{\text{Brake HP}}}}{{{\text{air HP}}}}$$

  খ

  $$\frac{{{\text{air HP}}}}{{{\text{Break HP}}}}$$

  গ

  $$\frac{{{\text{HP of ventilation}}}}{{{\text{HP input}}}}$$

  ঘ

  3m
• Ammonium Nitrate does not occur in nature and it is prepared by reacting with ammonia gas with . . . . . . . . acid.
  ক

  Benzene

  খ

  Tolune

  গ

  Potasium Nitrate

  ঘ

  Nitric
• Which of the following detonators are used mostly in oil and mineral prospecting?
  ক

  Plain detonators

  খ

  Electric short delay detonators

  গ

  Ordinary long delay detonators

  ঘ

  Seismic detonators