Mn:mining Engineering Worksheet - 2013 Page 6
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152013
MINING ENGG. –MN
Q.19
In the following figure, the coefficient of kinetic friction between the trolley and the surface is 0.04.
2
When the block is released from rest, the acceleration of the trolley in m/s
becomes
pulley
80kg
10kg
(A) 9.65
(B) 1.23
(C) 1.09
(D) 0.74
Q.20
Two meshing spur gear wheels of Module 6 have 24 and 42 teeth. The distance in mm between the
centres of the gear wheels is
(A) 1000
(B) 198
(C) 126
(D) 72
Q.21
In an experiment to study coal dust explosibility, it is found that at least 3.0 g of limestone dust
should be added to a sample of 2.0 g of coal dust to ensure that propagation of flame does not take
place. The explosibility factor of coal dust is
(A) 60.00
(B) 20.00
(C) 6.70
(D) 1.50
Q.22
A 20 m steel tape used in a mine survey is found to be 20 cm short when compared with a standard
3
3
tape. If the measured volume of a dump using the tape is 4000 m
, its actual volume in m
is
(A) 3881
(B) 3902
(C) 3920
(D) 4121
Q.23
A mine worker inhales normal air; whereas, the exhaled air contains 16.65% O
and 3.83% CO
.
2
2
The respiratory quotient of breathing for the worker is
(A) 0.23
(B) 0.89
(C) 0.99
(D) 1.13
Q.24
Block economic values in Lakhs of Rupees for a section of a block economic model are shown
below.
-1
-1
1
-1
0
-1
-1
0
0
0
-1
-2
-5
-3
-2
5
-2
-3
At a permissible slope angle of 1:1, the optimum pit value of the section in Lakhs of Rupees is
(A) 0
(B) 1
(C) 2
(D) 3
Q.25
The boundary of a mine is plotted on a scale of 1:2000. If a planimeter measures the plotted area as
2
2
58 cm
, the actual mine area in m
is
(A) 5800
(B) 11600
(C) 23200
(D) 29000
MN
6/15
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