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A mining project comprising of A, B and C activities is scheduled for 90 days at a cost of Rs. 1200 million. The manager of the project decides to reduce the time for completion of the project to 85 days. The decision was taken after 45 days, The minimum cost of the project in million rupees after crashing 5 days is<br><img src="/images/question-image/mining-engineering/mine-system-engineering/1682421056-M2-7-28-25.PNG" title="Mine System Engineering mcq question image" alt="Mine System Engineering mcq question image">
A
100
B
1300
C
1475
D
1825
Correct Answer:
1300
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A project network comprises five activities as shown below. The activity durations. in days. are as indicated. Crashing of any activity costs Rs. 1000 per day. If the project is crashed to the shortest possible duration without changing the critical path the total crashing coso in Rs. is
A
5000
B
4000
C
3000
D
2000
The following project network is given with arrows as activities and the numbers by each arrow representing job durations in days. The network has two dummy activities D
1
and D
2
. The minimum completion time of the project in days is
A
13
B
19
C
75
D
68
In an opencast mine shown in the figure below, the coal has a density of 1.4 t/m
3
. Assuming mining operation started from plane XY, the operating stripping ratio under the given conditions in m
3
/t is
A
2.32
B
2.47
C
2.56
D
2.64
A flat coal seam of thickness (t) 3m is excavated and broken roof rock has completely filled the space created due to extraction as shown in the figure. If the bulking factor of roof rock is 1.2. the caving height (H) in m is
A
15
B
16
C
14
D
12
A vertical ore body having a consistent width of 100 m has been excavated by the open pit method up to a depth of 100 m at a pit slope angle of 45°. The figure shows the cross section of the open pit. If the ore body is further excavated by a depth of 10 m, maintaining the same pit slope angle, the ratio of waste rock to ore is
A
1.2
B
2.1
C
3.0
D
3.9
Which of the following statements are true in context of scheduled banks?
1. All banks which are included in the Second Schedule to the Reserve Bank of India Act, 1934 are Scheduled Banks.
2. These banks comprise Scheduled Commercial Banks and Scheduled Co-operative Banks.
3. Scheduled Commercial Banks in India are categorized into five different groups - SBI, Nationalised Banks, Regional Rural Banks, Foreign Banks and Other Indian Scheduled Commercial Banks in the private sector.
4. Scheduled Co-operative Banks consist of Scheduled State Co-operative Banks and Scheduled Urban Co-operative Banks.
A
1, 2 and 3
B
2, 3 and 4
C
1, 2 and 4
D
1, 2, 3 and 4
Figure shows a two pulley system for hoisting a load of 10 kN. The coefficient of friction between each pulley and the rope is 0.2. The vertical and horizontal distances between the centers of the pulleys are 25m and 16m respectively. The tensions T
1
and T
2
respectively in kN are
A
6.00, 5.38
B
12.37, 11.06
C
18.74, 16.73
D
25.11, 22.41
If the scheduled completion time of a project is more than the earliest expected time for completion of the project, then the probability of completion of the project within the scheduled completion time will be
A
50 %
B
Less than 50 %
C
More than 50 %
D
100 %
A two tonne mine car is released from the top of an incline at a height of 3m as shown in the figure. The mine car travels 45m along the inclined track and another 85m along the horizontal track before coming to rest. The specific rolling resistance of the, car in N/tonne is
A
0.226
B
0.326
C
0.526
D
0.126
The following characteristic curves (P, Q, R, S) pertain to rotary drilling in rock.
Title of the curve
I : Torque versus RPM
II: Rate of penetration versus uniaxial compressive strength of rock
III : Rate of penetration versus weight on bit
IV : Specific energy versus weight on bit
Match the curves with their titles
A
P-III, Q-IV, R-II, S-I
B
P-II, Q-IV, R-I, S-III
C
P-IV, Q-III. R-II, S-I
D
P-I, Q-III, R-II, S-IV
