Match the following for ore handling operations in an underground metal mine
Arrangement Description
a. Draw point
1. arrangement that prevents oversized rock to pass
b. Ore pass
2. a system of vertical or near vertical openings for transferring ore from a stope to a single delivery point
c. Grizzly
3. a place where ore can be loaded and removed
d. Finger raise
4. a vertical or inclined opening used for transferring ore
A. a-4, b-3, c-2, d-1
B. a-3, b-4, c-1, d-2
C. a-2, b-4, c-1, d-3
D. a-3, b-1, c-2, d-4
Select an option to see the answer and solution.
Six detonators each having resistance of 1.5 ohm are connected in parallel. A 15 V exploder is connected to the detonators by two single-core cables of resistance 3 ohm each. The current in the circuit in Ampere is
Select an option to see the answer and solution.
What will be the overall slope of the benches shown in the figure?
A. 17.45°
B. 18.56°
C. 20.45°
D. 43.55°
Select an option to see the answer and solution.
In gassy mine being worked by soutirage method which of the following method of blasting is preferred?
A. solid blasting
B. cone blasting
C. camouflage blasting
D. coromant cut blasting
Select an option to see the answer and solution.
The rotational speed and cutting velocity of a drill are 350 rpm and 71.50 m/min respectively. The diameter of the rotary drill bit in mm is
Select an option to see the answer and solution.
Rocks are 'massive' when bedding planes are more than "A"m apart. A is given by
A. 0.4 m but less than 0.6 m
B. 0.6 m but less than 0.8 m
C. 0.8 m but less than 1.2 m
D. more than 1.2 m
Select an option to see the answer and solution.
'Run away switch' is used in connection with
A. direct rope Haulage
B. endless Haulage
C. gravity Haulage
D. tail rope Haulage
Select an option to see the answer and solution.
Which of the following credential is required for getting mining block in India?
A. 10% financial credential & 90% technical credential
B. 25% financial credential & 75% technical credential
C. 50% financial credential & 50% technical credential
D. 75% financial credential & 25% technical credential
Select an option to see the answer and solution.
An opencast mine has four benches. The height, width and face angle for each bench are 13 m, 30 m and 70° respectively. The overall slope angle of the benches in degrees is
A. 25.5°
B. 20.7°
C. 33.4°
D. 19.7°
Select an option to see the answer and solution.
Maximum permissible gradient for the haul road in opencast mines is
Select an option to see the answer and solution.
At zero-oxygen balance, the ratio of oxidizers to fuel ratio for ANFO is
A. 92 : 8
B. 93 : 7
C. 94 : 6
D. 95 : 5
Select an option to see the answer and solution.
What is the minimum requirement of percentage of oxygen at any place in the mine where persons are required to work or pass?
A. 19.8%
B. 19.6%
C. 19.4%
D. 19%
Select an option to see the answer and solution.
As per Mine Rules 1955 every shelter shall have a floor area of not less than:
A. 10 Sq. m
B. 12 Sq. m
C. 14 Sq. m
D. 16 Sq. m
Select an option to see the answer and solution.
Which of the following statutory provision restrict the propagation of hazards from one development district to other part of the bord and pillar mine?
A. ventilation stopping
B. air-crossing
C. panel system of working
D. explosion-proof stopping
Select an option to see the answer and solution.
Seams with bad roof having strata control problems is suitable for
A. Bord & Pillar mining
B. Blasting gallery
C. Longwall mining
D. Hydraulic mining
Select an option to see the answer and solution.
The drilling method which can apply for most wider range of depth is
A. Percussive drilling
B. Cable drilling
C. Diamond drilling
D. Calyx shot drilling
Select an option to see the answer and solution.
The place in mine, where explosive is stored is called
A. Shelter
B. Reserve station
C. Magazine
D. None of the above
Select an option to see the answer and solution.
Main difference in VRM and Blast Hole stoping is
A. Drilling technique
B. Blasting technique
C. Drilling and Blasting technique
D. None of the above
Select an option to see the answer and solution.
Lateral surface strain profile (SP) caused due to extraction of a longwall panel can be approximated by
A. SP I
B. SP II
C. SP III
D. SP IV
Select an option to see the answer and solution.
Which of the following gas in known as 'Marsh Gas'?
Select an option to see the answer and solution.
