Mn:mining Engineering Worksheet - 2013 Page 11
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152013
MINING ENGG. –MN
Q.45
A sub-critical subsidence profile is shown in the figure below. The points A, B, C, and D represent
respectively the points of
(A) zero vertical displacement, maximum tension, inflexion, maximum compression
(B) inflexion, maximum tension, maximum compression, zero vertical displacement
(C) maximum tension, inflexion, maximum compression, zero vertical displacement
(D) maximum compression, maximum tension, inflexion, zero vertical displacement
Q.46
The uniaxial compressive strength of a limestone sample is 80 MPa. The sample is confined at a
pressure of 20 MPa in a triaxial compressive strength test. Based on Hoek-Brown failure criteria
the maximum principal stress at failure in MPa is
(consider rock constants as m = 7.88, s = 1.0 and a = 0.5)
(A) 117.9
(B) 132.3
(C) 137.9
(D) 157.9
Q.47
A wire of length L is cut into two pieces to construct a circle and an equilateral triangle such that
the combined area is minimum. The length of the wire used to construct the circle is
√
(B)
(C)
(D)
(A)
√
√
√
Common Data Questions
Common Data for Questions 48 and 49:
0.06
400, where
Pressure characteristic of a mine fan is given by,
is the pressure in Pa and
3
2
8
the quantity in m
/s. The resistance of the mine is 0.19 Ns
/m
.
3
Q.48
The mine quantity in m
/s is
(A) 160.0
(B) 53.5
(C) 45.9
(D) 40.0
Q.49
An identical fan is installed in the mine to operate in series with the existing fan. The new mine
3
quantity in m
/s is
(A) 75.6
(B) 56.7
(C) 50.8
(D) 30.2
MN
11/15
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