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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<sub>1</sub> and D<sub>2</sub>. The minimum completion time of the project in days is<br><img src="/images/question-image/mining-engineering/mine-system-engineering/1682420921-M2-7-23-20.PNG" title="Mine System Engineering mcq question image" alt="Mine System Engineering mcq question image">
A
13
B
19
C
75
D
68
Correct Answer:
68
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
A
100
B
1300
C
1475
D
1825
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
In the project network shown activity durations are given in months. If the activity can be crashed to expedite the project, which one would you crash and by how many months?
A
C, 1
B
C, 2
C
D, 1
D
E, 1
Optimistic time, most likely time and pessimistic times for the activities of a network in the given figure are written above their arrows. If the contractual obligation time for the project is 75, the latest occurrence time for the event 2, is
A
20
B
25
C
35
D
15
The three time estimates for the activities of the network shown in the given figure are shown above their arrows. The earliest expected time for the event 4, is
A
19
B
14
C
24
D
None of these
A bunker-conveyor system as shown in the figure works under the following scheme:
i. Bunker and two conveyors running
ii. Bunker and either of the two conveyors running
If the bunker and the two conveyors have identical reliability of 0.9. the system reliability is
A
0.729
B
0.810
C
0.999
D
0.891
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 pumping station in a mine has 4 pumps, P
1
, P
2
, P
3
and P
4
which are connected functionally in parallel configuration as shown in the figure. The individual reliability of the pumps P
1
, P
2
, P
3
and P
4
are 0.80, 0.90, 0.85 and 0.95 respectively. For an effective dewatering operation in the mine denoting system success, at least three pumps should be in operation. The reliability of the system is
A
0.19
B
0.93
C
0.99
D
0.58
A shopkeeper has a job to print certain number of documents and there are three machines P, Q and R for this job. P can complete the job in 3 days, Q can complete the job in 4 days and R can complete the job in 6 days. How many days the shopkeeper will it take to complete the job if all the machines are used simultaneously ?
A
4\/3 days
B
2 days
C
3\/2 days
D
4 days
The individual reliability values of four sub-systems are given in the figure below. The reliability of the system is
A
0.42
B
0.22
C
0.61
D
0.52
