Drilling And Blasting — Part 1 MCQs with Explanations

A self-rescuer is a personal protective device used in underground mines to protect miners from toxic gases , especially carbon monoxide (CO) , during emergencies. The main purpose of a self-rescuer is to enable the wearer to safely escape from an area affected by hazardous atmospheres resulting from a fire or an explosion . These incidents commonly release carbon monoxide and other harmful gases, which are life-threatening without respiratory protection. Self-rescuers function by either filtering toxic gases (chemical-based) or providing a small oxygen supply (oxygen-based) for short durations, allowing enough time to evacuate. Therefore, the correct answer is: Fire, Explosion

It is noiseless in character is the correct answer to “Which of the following prime characteristic the nonel blasting has”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Air pollution is the correct answer to “Cyclone, bag filter and scrubber can be used for control.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Emulsion is the correct answer to “A two phase system in which an inner or dispersed phase is distributed in an outer called”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Heavy is the correct answer to “The secondary barrier also called”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Quartz is the correct answer to “The dust generally not used for spraying in coal faces.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

0.8 - 1.1m3 is the correct answer to “The tubs capacity in direct rope haulage varying from when pedestal bearing are used.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

12 is the correct answer to “No percentage of firedamp is explosive, when the percentage of oxygen is . . . . . . . . or less as per coward diagram.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Thickly bedded rocks is the correct answer to “Wedge cut pattern commonly used for . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Yes is the correct answer to “ANFO initiated by No. 8 detonator, in non mining practice.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Bernouili's is the correct answer to “The basic principle behind the pressure survey in a mine is depend as . . . . . . . . theorem.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

It is the average velocity over the cross section perpendicular to the direction of flow is the correct answer to “What is the characteristic of velocities considered in Euler's equation.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Flame proof is the correct answer to “If the electricity is used the motors, switch gears and transformers should be provided with . . . . . . . . enclosures.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Cross drive is the correct answer to “Horizontal roadway driven within ore body between h/w and f/w right angles to drift.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

60 m3/min is the correct answer to “The minimum air quantity required at all working places in B/P is.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

J is the correct answer to “Small magzines in mine premises are accorded the licence in the form.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Normal to the direction of air flow is the correct answer to “The plane of rotation of the vanes of anemometer should be as near as”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Air decking is the correct answer to “When explosive charges in a hole is separated by air gaps in stead of stemming materials then the process is known as”. This question is standard in competitive examination syllabi for Drilling And Blasting.

30 cm is the correct answer to “To deal with the misfires a relieving hole shall be so placed that at no point shall it be nearer than "A" cm from the misfired hole. A is given by”. This question is standard in competitive examination syllabi for Drilling And Blasting.

1m is the correct answer to “The isolation stopping in I and II degree gassy coal mine should have minimum thickness of”. This question is standard in competitive examination syllabi for Drilling And Blasting.

2 kg is the correct answer to “The CO 2 absorbent placed in breathing bag, weights of absorbent is . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Very hard is the correct answer to “The road header machines are capable of cutting rock which are not . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Detonating fuse is the correct answer to “Cordex is a”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Foam is the correct answer to “Class 'B' fires involve liquids generally quenched by . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

-183°C is the correct answer to “Oxygen gas liquifies at . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

2.5 m/sec is the correct answer to “Safe working velocity should not exceed at places where carbide lamps used . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

30 - 100m is the correct answer to “In hosemask, a currugated tube between the mask and air tube or rubber . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Non permitted is the correct answer to “These type of explosives not used in under ground coal mines.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Ground is the correct answer to “The temporary stoping have to be buitt in places which are free from . . . . . . . . movements and cracks.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Two entrances is the correct answer to “Every mine should have at least.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Haulage roads is the correct answer to “Regulator can not be placed in . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

30% is the correct answer to “The venture tube blower having a convergent - divergent tube is more efficient and increase the flow of air by”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Seismic detonators is the correct answer to “Which of the following detonators are used mostly in oil and mineral prospecting”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Nitric is the correct answer to “Ammonium Nitrate does not occur in nature and it is prepared by reacting with ammonia gas with . . . . . . . . acid.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

$$\frac{{{\text{air HP}}}}{{{\text{Break HP}}}}$$ is the correct answer to “The fan efficiency is given by . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

2500 - 5000 is the correct answer to “Permitted explosives used in mines have a VOD ranging from in m/sec.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

Man power employed is the correct answer to “Minimum quantity of air required for ventilation of coal mine depends on”. This question is standard in competitive examination syllabi for Drilling And Blasting.

CaCl2 is the correct answer to “The coolest used in 1 hr. apparatus of proto mark V apparatus.”. This question is standard in competitive examination syllabi for Drilling And Blasting.

$$\frac{{{\text{Perimeter}}}}{{{{{\text{(Area)}}}^{\frac{1}{2}}}}}$$ is the correct answer to “Shape factor is defined by . . . . . . . .”. This question is standard in competitive examination syllabi for Drilling And Blasting.

8 is the correct answer to “The quantity of air has to be increased from 1500m 3 to 3000 m 3 /mm, what will be effect on H. P of the fan.”. This question is standard in competitive examination syllabi for Drilling And Blasting.