Drilling And Blasting — Part 2 MCQs with Explanations

40 - 50; 1.8 - 2.3 is the correct answer to “A person inhales . . . . . . . . 1/min, the O 2 consumption . . . . . . . . 1/min, when doing hard work in pauses.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Inlet is the correct answer to “If the patient needs more than 30 1/min., draws additional air through the . . . . . . . . value on the mask, in reviving apparatus.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

2%; 75% is the correct answer to “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.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Beyond 9m is the correct answer to “In very thick seams the thickness of coal is . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Goaf andold workings is the correct answer to “The pressure of forcing fan has effect of keeping the gases in . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

All is the correct answer to “For introduction of solid blasting need apporval from DGMS for exemption under following regulation.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Yes is the correct answer to “Water infusion is one of the method of prevention of dust at the faces.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Flame front is the correct answer to “When coal dust propagates explosion . . . . . . . . as in case of gas explosion.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Vltrain is the correct answer to “Coal more liable to spontanious heating when thesebands present”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Active fire is the correct answer to “If the $$\frac{{CO}}{{{O_2}}}$$ deficiency ratio is 3% or more it indicates . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

1.5 is the correct answer to “The constant feed rate of BG 174 apparatus is . . . . . . . . It/min.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

3.3 kg is the correct answer to “The weight of spiral - 2C apparatus.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Quantity survey is the correct answer to “Ventilation survey means”. This question is standard in competitive examination syllabi for Drilling And Blasting.

LOE is the correct answer to “Class 8 group explosives are”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Superntendent is the correct answer to “A rescue station is under the control of . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Shaft sinking is the correct answer to “Cactus grab is employed in . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Once in every 3 months is the correct answer to “Every shot-firing apparatus needs to be tested at what minimum intervals as stated in CMR 2017”. This question is standard in competitive examination syllabi for Drilling And Blasting.

CI is the correct answer to “Conditions for deep hole blasting shall be specified in a general order by whom”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Breathing is the correct answer to “In a sealed off fire area as the O 2 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.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Ammonia and water vapour is the correct answer to “Silica gel in gas mask removes . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Double tube core barrel is the correct answer to “Which type of device is recommended for good core recovery from soft rock”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Every week is the correct answer to “All stone dust barriers shall be examined in . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

600 m is the correct answer to “The depth of the deepest shaft in coal mine in India.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

16th October 1971 is the correct answer to “The Nationalization of coaking coal mines was done in . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Gas mask is the correct answer to “The chemicals used in self rescuer is same as . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

$$wg \propto {N^2}{\text{ or }}{Q^2}{\text{ or }}{V^2}$$ is the correct answer to “The law related to water gauge, fan speed or quantity is . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

0.75 is the correct answer to “A mine is not considered to be adequately ventilated if the fire damp percentage in General body of the return air exceeds . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

4.8 m is the correct answer to “The maximum width of roadway permitted by law.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

18 is the correct answer to “As per mining engineers rule, minimum radius of shaft pillar for shallow shaft.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

45° is the correct answer to “No part of highwall slope of reclaimed overburden should not exceed angle is”. This question is standard in competitive examination syllabi for Drilling And Blasting.

0.316 is the correct answer to “If the velocity of air in a settling chamber is 0.3 m/s terminal velocity of the particle is 0.19 m/s then find out h/l ratio of chamber assuming eddy factor 0.5.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

No is the correct answer to “Use of alternative to explosives may prevent raising of dust.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Incline is the correct answer to “Which drivage is cheaper and quicker.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

7.5 is the correct answer to “Air velocities in smooth lined roads . . . . . . . . m/sec.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

no shot hole shall be fired is the correct answer to “Which of the following statements is correct when presence of inflammable gas is detected in any place in a ventilating district”. This question is standard in competitive examination syllabi for Drilling And Blasting.

N2 producing machine is the correct answer to “In Jharia, fire near Londna and Fire area was prevented from spreading further by installing the fire area by”. This question is standard in competitive examination syllabi for Drilling And Blasting.

4.2 m is the correct answer to “Where a shaft accommodates a pair of single cages, the diameter may be nearly.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Beyond 40° is the correct answer to “Coal mines are said to be very steep; if the inclination is . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Cross measure drift is the correct answer to “An underground roadway through stone connecting two or more coal seams.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Development is the correct answer to “Drivage of roadway in coal in a mine, and their network reaches a predetermined boundary called a . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.