A pumping station in a mine has 4 pumps P1 P2...

Home / Mining Engineering / Mine System Engineering / Question

Examveda

A pumping station in a mine has 4 pumps, P₁, P₂, P₃ and P₄ which are connected functionally in parallel configuration as shown in the figure. The individual reliability of the pumps P₁, P₂, P₃ and P₄ 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

Answer: Option B

This Question Belongs to Mining Engineering >> Mine System Engineering

Join The Discussion

Related Questions on Mine System Engineering

Workmen arrive at a mine workshop to receive tools for maintenance. The inter-arrival time of workmen at the service counter is exponentially distributed with an average time of 10 min. The service time at the counter is also distributed exponentially with a mean time of 6 min. The average time spent by a workman waiting for his turn to be served in min is

A. 9

B. 12

C. 15

D. 18

View Answer

A mining project is composed of five activities whose three time estimates in months are given below:

Activity	Estimated duration (months)
	Optimistic time	Most likely time	Permissible time
1 - 2	1	1	7
1 - 3	2	5	8
2 - 4	1	1	7
3 - 4	2	5	14
4 - 5	3	6	15

The expected duration of the mining project in months is

A. 5

B. 16

C. 18

D. 29

View Answer

The failure data analysis of a longwall mining system consisting of thre major subsystems revealed that the failure rate of shearer, face conveyor any stage loader are 0.15/ hour, 0.2/ hour and 0.1/ hour respectively. If all the subsystems must be running for a satisfactory system operation, the reliability of the longwall system for a period of 4 hours is

A. 0.165

B. 0.259

C. 0.405

D. 0.63

View Answer

Consider the following linear programming problem:
Maximize z = 3x + 2y
s.t. 3x + 2y ≥ 15
2x + 3y ≤ 6
x ≥ 0, y ≥ 0
The above linear programming problem has

A. Unique optimal solution

B. Multiple optimal solution

C. Unbounded solution

D. Infeasible solution

View Answer

More Related Questions on Mine System Engineering