11
P-5 explosives are used for
A)
pre-cut blasting
B)
solid blasting
C)
open cast blasting
D)
over burden blasting
Answer & Solution
Answer: Option
B
12
Order the followings in decreasing stability of host rock:
A)
1, 2, 3, 4
B)
2, 3, 4, 1
C)
4, 3, 2, 1
D)
4, 2, 3, 1
Answer & Solution
Answer: Option
A
13
Which of the following controls the magnitude and direction of the front abutment pressure for immediate roof in long wall working?
A)
Young's Modulus
B)
stratigraphic sequence
C)
periodic caving
D)
strong main roof
Answer & Solution
Answer: Option
A
14
In a 3rd degree gassy mine the velocity of air measured at 7.5 m out bye of the discharge end of an air pipe should be
A)
25 m/min
B)
45 m/min
C)
60 m/min
D)
75 m/min
Answer & Solution
Answer: Option
A
15
In depillaring operation major coal losses are from
A)
coal left in underground for unfavourable geological conditions
B)
coal left to protect surface features
C)
coal loss due to spon heating
D)
coal left as ribs within the pillars
Answer & Solution
Answer: Option
D
16
Continuous miner and shuttle car combination is NOT applicable in mining with
A)
rib pillar extraction technique
B)
wangawilli system
C)
room and pillar method
D)
longwall method
Answer & Solution
Answer: Option
B
17
The angle of draw in a trough subsidence helps in determining the
A)
Maximum subsidence
B)
Extent of surface subsidence
C)
Plane of fracture
D)
Critical width of the opening
Answer & Solution
Answer: Option
B
18
Which gas is synonymous with 'White damp'?
A)
CO
B)
H2 S
C)
CH4
D)
N2
Answer & Solution
Answer: Option
A
19
Panel barrier is punctured for
A)
district transport layout
B)
district return
C)
pumping water out of the panel
D)
to take out miners
Answer & Solution
Answer: Option
B
20
Every man-hole shall be kept clean & clear of obstruction, white-washed for a distance of not less than
A)
0.3 m
B)
0.6 m
C)
0.9 m
D)
1.2 m
Answer & Solution
Answer: Option
A
