List of practice Questions

Massive sandstone in immediate roof delays the local fall in roof of a coal mine. Under this condition, crushing of the pillars at out-bye side is called
A flat long wall panel is mined out at an area having subsidence factor ‘a’. The measured maximum subsidence on the surface is ‘S’ for a mining height of ‘m’. The subsidence is sub critical, if
Dilatancy of rock is associated with
Given S is the setting load and Y is the yield load of a hydraulic prop, the correct relationship between S and Y is
Which one of the following is the most likely mode of slope failure for waste dump?
Which one of the following supports does not require a power pack for its operation?
In RMR, Rock Quality Designation (RQD) 41% to 60% indicates a rock as
The property that cannot be determined from uni-axial compressive strength test of a rock sample fitted with strain gauges is
Match the following: $$ \begin{array}{ll|l} \text{Instrument} & & \text{Measurement} \\ \hline P & \text{Flat jack} & 1.\ \text{In-situ stress in rock} \\ Q & \text{Borehole deformation gauge} & 2.\ \text{Load} \\ R & \text{Tape extensometer} & 3.\ \text{Bed separation resistance} \\ S & \text{Bore hole penetrometer} & 4.\ \text{Roof convergence} \\ \end{array} $$
The term “bulking factor” refers to
For a cylindrical sample of cross-sectional area $ A $, length $ L $, Young’s modulus $ E $ and axial load $ P $, the strain energy stored is
Poisson’s ratio is the
The ratio of specific weight of an intact rock to that of loose rock is called as
Out of the support categories given for an underground coal mine, identify the “active support”
The angle in degrees at which a ridge line intersects contours is
The basic concept behind GPS is
Every line has two bearings such as fore bearing and back bearing. If fore bearing is less than $180^\circ$, then what will be the back bearing?
One of the tacheometric constants is additive, the other constant is
The length of the tangent of a simple circular curve of radius $R$ and angle of deflection $\Delta$ is given by
If only two members form a truss joint and no external load or support reaction is applied to the joint, then the members
A multi point borehole extensometer is used to monitor
Bauxite is
The drivage driven from one coal seam to adjacent coal seam in underground coal mines is called as
The starting point of shaft at the ground surface is called
Insufficient stemming causes