In case of opencast working as per CMR 2017 where any permanent building or structures not belonging to the owner lies within the danger zone, the aggregate maximum charge per round at one time shall not exceed
A. 565 gm
B. 1 Kg
C. Amount fixed by CI
D. Amount fixed by Blasting Office
Select an option to see the answer and solution.
The total pressure developed by a fan is equal to
A. Static pressure - velocity pressure
B. Velocity pressure - static pressure
C. Velocity pressure + static pressure
D. Velocity pressure × static pressure
Select an option to see the answer and solution.
Each seam should have at least . . . . . . . . out lets to surface.
Select an option to see the answer and solution.
Air velocities at the working face should be between . . . . . . . .
A. 1 - 3 m/sec
B. 4 - 10 m/sec
C. 0.5 - 2 m/sec
D. 3 - 5 m/sec
Select an option to see the answer and solution.
The portable apparatus which provides the current necessary for firing electric detonators is called
A. charger
B. exploder
C. condenser
D. dynamo
Select an option to see the answer and solution.
By using spot coolers in mines, they supply cool air at working faces, they have disadvantage of leaving the rest of the mine . . . . . . . .
A. Cool
B. Chill
C. Hot
D. Freeze
Select an option to see the answer and solution.
The main element in fuse head of detonator is
A. AN
B. Di-nitro glycol
C. TNT
D. LMNR
Select an option to see the answer and solution.
Vistaram mask and speaking diaphragm fitted in the self contained breathing apparatus of mark . . . . . . . .
A. Mark IV
B. Mark V
C. Mark VI
D. BG 174
Select an option to see the answer and solution.
The case or container containing explosives shall be left or kept in a place of a mine which is legibly marked as
A. Shelter
B. Rest station
C. Reserve station
D. Rescue station
Select an option to see the answer and solution.
A level roadway which leads from shaft passes through country rock, to cut across the lode at an angle to strike.
A. Cross measure drift
B. Crosscut
C. Cross cut
D. Rise cut
Select an option to see the answer and solution.
Name the instrument to measure incubation period . . . . . . . .
A. Incumeter
B. Faze heater
C. Calo meter
D. None
Select an option to see the answer and solution.
The barrier must be provided at a distance of not less than . . . . . . . .m from nearest working face at not more than . . . . . . . .m from farthest face.
A. 50; 100
B. 150; 400
C. 200; 400
D. 300; 400
Select an option to see the answer and solution.
With reference to coward diagram, match the following the context of explosibility of a mixture of normal air and methane air
O2 % ; CH4 % Mixture Status
a. 20.5 ; 2.4
1. Impossible mixture
b. 19.0 ; 9.5
2. Non explosive
c. 17.0 ; 19
3. Potentially Explosive
d. 20 ; 19.5
4. Explosive
A. a-2, b-4, c-3, d-1
B. a-2, b-4, c-1, d-3
C. a-2, b-3, c-1, d-4
D. a-3, b-2, c-1, d-4
Select an option to see the answer and solution.
Smoke helmet having . . . . . . . . eye pieces fitted in alluminium frame.
A. Silica
B. Glass
C. Mica
D. Quartz
Select an option to see the answer and solution.
A person inhales . . . . . . . . l/min, the O2 consumption . . . . . . . . l/min when doing normal work.
A. 60 - 90; 2.7 - 4
B. 15 - 20; 0.6 - 0.9
C. 30 - 40; 1.3 - 1.8
D. None
Select an option to see the answer and solution.
The proto mark IV apparatus O2 cylinder made of . . . . . . . . and empty capacity . . . . . . . .
A. Light alloy; 2 L
B. Steel, 3 L
C. Carbon steel, 2 L
D. M.S, 3 L
Select an option to see the answer and solution.
Fibre, charcoal, wood meal, sulphur in explosive composition act as . . . . . . . .
A. Oxydizing agents
B. Stabilizers
C. Sensitizers
D. Combustable materials
Select an option to see the answer and solution.
The drilling pattern followed in underground coal mine is
A. wedge cut
B. fan cut
C. coromant cut
D. drag cut
Select an option to see the answer and solution.
Number of swings of shovel for loading one dumper is . . . . . . . .
A. 5 - 6
B. 4 - 6
C. 3 - 6
D. 6 - 7
Select an option to see the answer and solution.
Empty, cylinder capacity of BG 174 is . . . . . . . . litters.
Select an option to see the answer and solution.
