71
For reducing leakage in u/g workings it has been recommended to use.
A)
Single high pressure fan
B)
Low pressure fan in series
C)
Low pressure fan in parallel
D)
None
Answer & Solution
Answer: Option
B
72
The constituents in slurry explosive are
A)
Fuel sensitizer, oxidizer, water, thicker, cross linking agents, gassy agent, stabilizer
B)
Fuel sensitizer, oxidizer, water, thickner gassy agent
C)
Thickner, water, gassy agent, stabilizer, oxydizer
D)
Fuel, thickner, cross linking agents, gassy agent water, fuel sensitizer, oxydizer
Answer & Solution
Answer: Option
A
73
Air lock doors opening towards the DC shaft against air pressure, the third door open in . . . . . . . . direction.
A)
Same
B)
Side pressure
C)
Opposite
D)
None
Answer & Solution
Answer: Option
C
74
A spot on the floor from where gravity fed are of a higher level is loaded into tubs a mine caves.
A)
Dew point
B)
Draw point
C)
Draw angle
D)
Angle of draw
Answer & Solution
Answer: Option
B
75
Air velocities in shaft with regid guides and fan drifts . . . . . . . .
A)
5
B)
7.5
C)
12.5
D)
17
Answer & Solution
Answer: Option
C
76
Each person consumes . . . . . . . . litters of O2 per minute/
A)
2
B)
1.5
C)
2.5
D)
3
Answer & Solution
Answer: Option
B
77
The isolation stopings should be well locked into the roof, floor, sides, the minimum depth of locking should be in coal.
A)
30 cm
B)
50 cm
C)
15 cm
D)
1 m
Answer & Solution
Answer: Option
D
78
To deal with the slope problem in OC mine the blasting system should be
A)
Cushion blasting
B)
Pre splitting
C)
Line drilling
D)
Muffled blast
Answer & Solution
Answer: Option
B
79
Hindustan zinc limited, Zawar in
A)
Madhya Pradesh
B)
Rajasthan
C)
Karnataka
D)
West Bengal
Answer & Solution
Answer: Option
B
80
Splits reduce the doors on haulage roads but increase number of . . . . . . . .
A)
$$\frac{1}{R} = \frac{1}{{{R_1}}} + \frac{1}{{{R_2}}} + \frac{1}{{{R_3}}}\,.\,.\,.\,.\,.\,\frac{1}{{{R_n}}}$$
B)
$$\frac{1}{{\sqrt R }} = \frac{1}{{\sqrt {{R_1}} }} - \frac{1}{{\sqrt {{R_2}} }} - \frac{1}{{\sqrt {{R_3}} }}\,.\,.\,.\,.\,.\, - \frac{1}{{\sqrt {{R_n}} }}$$
C)
$$\frac{1}{{\sqrt R }} = \frac{1}{{\sqrt {{R_1}} }} + \frac{1}{{\sqrt {{R_2}} }} + \frac{1}{{\sqrt {{R_3}} }}\,.\,.\,.\,.\,.\,\frac{1}{{\sqrt {{R_n}} }}$$
D)
$$\frac{1}{{\sqrt R }} = \sqrt {{R_1}} + \sqrt {{R_2}} + \sqrt {{R_3}} \,.\,.\,.\,.\,.\,\sqrt {{R_n}} $$
Answer & Solution
Answer: Option
C
