The shaft-top coordinates of two vertical shafts are given below. The depth of the shaft A and B are 200 m and 149 m, respectively.
| Shaft | Latitude (m) | Departure (m) | Surface RL (m) |
|---|---|---|---|
| A | N670.0 | W150.0 | 250 |
| B | N170.0 | E50.0 | 209 |
Two weightless cables of equal length and cross sectional area are hanging from a ceiling as shown in the figure. They are connected by a horizontal light bar of length 1.0 m and pulled by a force, F. The modulus of elasticity of Cable-1 and Cable-2 are 50 GPa and 200 GPa, respectively. If the deformation in both the cables is equal, the distance , in m is ______. (round off to one decimal place)
The net present values (NPV) of two mining project proposals A and B are as given.
where, () is discount rate.
The required rate of return for which both the proposals have equal possibility of acceptance and rejection, is ______. (round off to two decimal places)
The value of , is ______. (round off to two decimal places)
A coal seam of uniform thickness 12 m is dipping at an angle 30° as shown in the figure. The ultimate pit is demarcated based on allowable instantaneous stripping ratio of 10 m³/tonne and safe slope angle of 45°. The density of coal is 1.41 tonne/m³. The length, L in m is ______. (round off to two decimal places)
Information on Activity-Time duration of a project is provided below
The expected project duration in weeks, is_______. (in integer)
The ratio of the number of girls to boys in class VIII is the same as the ratio of the number of boys to girls in class IX. The total number of students (boys and girls) in classes VIII and IX is 450 and 360, respectively. If the number of girls in classes VIII and IX is the same, then the number of girls in each class is
Visualize a cube that is held with one of the four body diagonals aligned to the vertical axis. Rotate the cube about this axis such that its view remains unchanged. The magnitude of the minimum angle of rotation is
Exposure to loud impulsive noise may lead to
In a self-contained closed-circuit breathing apparatus,